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Khan Academy - Cosmology and Astronomy 1-48

Random predictions for 2060 | Cosmology & Astronomy | Khan Academy
Random predictions for 2060 | Cosmology & Astronomy | Khan AcademySal's random predictions for the year 2060. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/measuring-a…
- 27 Dec 11, 11:22pm -
Energy inputs for tilling a hectare of land | Cosmology & Astronomy | Khan Academy
Energy inputs for tilling a hectare of land | Cosmology & Astronomy | Khan AcademyThinking about energy consumption for tilling land. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-ea…
- 27 Dec 11, 7:49pm -
Land productivity limiting human population | Cosmology & Astronomy | Khan Academy
Land productivity limiting human population | Cosmology & Astronomy | Khan AcademyThinking about how we get Calories from the land limits human population densities. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science…
- 27 Dec 11, 1:27am -
Collective learning | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
Collective learning | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyHow symbolic language drives collective learning and how this is one of the truly differentiating aspects of human beings relative to the rest of the an…
- 23 Nov 11, 11:56pm -
Chronometric revolution | Cosmology & Astronomy | Khan Academy
Chronometric revolution | Cosmology & Astronomy | Khan AcademyDiscussion of the relatively recent changes in our ability as a species to shine light on our deep past. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/scienc…
- 24 Oct 11, 4:00pm -
Carbon 14 dating 1 | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
Carbon 14 dating 1 | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyCarbon 14 Dating 1. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/measurin…
- 21 Oct 11, 5:52pm -
Carbon 14 dating 2 | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
Carbon 14 dating 2 | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyCarbon 14 Dating 2. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/measurin…
- 21 Oct 11, 5:52pm -
K-Ar dating calculation | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
K-Ar dating calculation | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyWorking through a calculation for K-Ar dating (good to have some prior experience with e and logarithms). Created by Sal Khan.Watch the next lesso…
- 21 Oct 11, 5:46pm -
Potassium-argon (K-Ar) dating | Cosmology & Astronomy | Khan Academy
Potassium-argon (K-Ar) dating | Cosmology & Astronomy | Khan AcademyHow K-Ar dating can be used to date very old volcanic rock and the things that might be buried in between. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.or…
- 21 Oct 11, 4:23pm -
Firestick farming | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
Firestick farming | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyHow the indigenous Australians used fire to change their environment. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cos…
- 25 Aug 11, 5:39pm -
Apsidal precession (perihelion precession) and Milankovitch cycles | Khan Academy
Apsidal precession (perihelion precession) and Milankovitch cycles | Khan AcademyApsidal Precession (Perihelion Precession). Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-unive…
- 14 Jul 11, 10:11pm -
What causes precession and other orbital changes | Cosmology & Astronomy | Khan Academy
What causes precession and other orbital changes | Cosmology & Astronomy | Khan AcademyWhat causes precession and other orbital changes. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/eart…
- 14 Jul 11, 9:40pm -
Precession causing perihelion to happen later | Cosmology & Astronomy | Khan Academy
Precession causing perihelion to happen later | Cosmology & Astronomy | Khan AcademyClarifying the effect of axial precession on the calendar and the date of perihelion and aphelion. Created by Sal Khan.Watch the next lesson: https://www.khanac…
- 14 Jul 11, 7:29pm -
Are southern hemisphere seasons more severe? | Cosmology & Astronomy | Khan Academy
Are southern hemisphere seasons more severe? | Cosmology & Astronomy | Khan AcademyAre Southern Hemisphere seasons more severe because of the eccentricity in Earth's orbit? Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/…
- 14 Jul 11, 5:48pm -
Milankovitch cycles precession and obliquity | Cosmology & Astronomy | Khan Academy
Milankovitch cycles precession and obliquity | Cosmology & Astronomy | Khan AcademyHow changes in Earth's rotation can effect Earth's seasons and climate. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-…
- 13 Jul 11, 11:19pm -
How earth's tilt causes seasons | Cosmology & Astronomy | Khan Academy
How earth's tilt causes seasons | Cosmology & Astronomy | Khan AcademyHow being Earth's tilt causes seasons. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/earth-title-…
- 13 Jul 11, 9:38pm -
Seasons aren't dictated by closeness to sun | Cosmology & Astronomy | Khan Academy
Seasons aren't dictated by closeness to sun | Cosmology & Astronomy | Khan AcademyWhy our closeness to the sun does not dictate the seasons. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/…
- 13 Jul 11, 7:49pm -
Introduction to light | Electronic structure of atoms | Chemistry | Khan Academy
Introduction to light | Electronic structure of atoms | Chemistry | Khan AcademyLight and the electromagnetic radiation spectrum. Wave and particle-like behavior, and how to calculate the wavelength or frequency of a light wave. Created by Sal Kh…
- 12 Jul 11, 4:47pm -
Stellar parallax | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Stellar parallax | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyAnother version of the stellar parallax introduction. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronom…
- 11 Jul 11, 7:59pm -
Development of agriculture and writing | Cosmology & Astronomy | Khan Academy
Development of agriculture and writing | Cosmology & Astronomy | Khan AcademyThe Paleolithic and Neolithic eras of the Stone Age. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-…
- 10 Jun 11, 12:30am -
Correction calendar notation | Cosmology & Astronomy | Khan Academy
Correction calendar notation | Cosmology & Astronomy | Khan AcademyCorrecting the time difference calculation by taking into account that there is no year 0. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmolo…
- 3 Jun 11, 9:20pm -
Understanding calendar notation | Cosmology & Astronomy | Khan Academy
Understanding calendar notation | Cosmology & Astronomy | Khan AcademyDifference between BC, BCE, AD and CE. A little bit about the birth of Jesus as well. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology…
- 30 May 11, 6:17pm -
Human evolution overview | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
Human evolution overview | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyCambrian explosion and biodiversity in the Phanerozoic Eon. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmol…
- 28 May 11, 10:11pm -
Detectable civilizations in our galaxy 5 | Cosmology & Astronomy | Khan Academy
Detectable civilizations in our galaxy 5 | Cosmology & Astronomy | Khan AcademyApsidal Precession (Perihelion Precession). Created by Sal Khan.This is the last video in our Cosmology and Astronom subject! Now move on to our first video in Compu…
- 23 May 11, 5:17pm -
Detectable civilizations in our galaxy 4 | Cosmology & Astronomy | Khan Academy
Detectable civilizations in our galaxy 4 | Cosmology & Astronomy | Khan AcademyTaking a shot at estimating the number of detectable civilizations. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astr…
- 21 May 11, 12:21am -
Detectable civilizations in our galaxy 3 | Cosmology & Astronomy | Khan Academy
Detectable civilizations in our galaxy 3 | Cosmology & Astronomy | Khan AcademyReconciling with the traditional Drake Equation. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-un…
- 20 May 11, 11:54pm -
Detectable civilizations in our galaxy 2 | Cosmology & Astronomy | Khan Academy
Detectable civilizations in our galaxy 2 | Cosmology & Astronomy | Khan AcademyWhy do we even care about the Drake Equation. Thinking about the fraction of a planet's life when a civilization might be detectable. Created by Sal Khan.Watch the n…
- 20 May 11, 11:54pm -
Detectable civilizations in our galaxy 1 | Cosmology & Astronomy | Khan Academy
Detectable civilizations in our galaxy 1 | Cosmology & Astronomy | Khan AcademyA framework for thinking about how many detectable civilizations are out there. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmol…
- 20 May 11, 9:05pm -
Scale of the small | Scale of the universe | Cosmology & Astronomy | Khan Academy
Scale of the small | Scale of the universe | Cosmology & Astronomy | Khan AcademyFrom honey bees to cells, viruses, and atoms -- understanding the scale of the very small. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/s…
- 19 May 11, 8:32pm -
Scale of the large | Scale of the universe | Cosmology & Astronomy | Khan Academy
Scale of the large | Scale of the universe | Cosmology & Astronomy | Khan AcademyAttempting to comprehend the scale of the large. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-sc…
- 17 May 11, 10:16pm -
Pangaea | Earth geological and climatic history | Cosmology & Astronomy | Khan Academy
Pangaea | Earth geological and climatic history | Cosmology & Astronomy | Khan AcademyPangaea - the idea of Pangaea and some of the evidence behind it. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and…
- 8 Feb 11, 12:14am -
How we know about the earth's core | Cosmology & Astronomy | Khan Academy
How we know about the earth's core | Cosmology & Astronomy | Khan AcademyS-wave shadow and P-wave detection patterns give us information about the core. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-an…
- 4 Feb 11, 10:39pm -
The mohorovicic seismic discontinuity | Cosmology & Astronomy | Khan Academy
The mohorovicic seismic discontinuity | Cosmology & Astronomy | Khan AcademyThe Mohorovicic Seismic Discontinuity- boundary between crust and mantle (or Moho). Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmo…
- 4 Feb 11, 10:21pm -
Refraction of seismic waves | Cosmology & Astronomy | Khan Academy
Refraction of seismic waves | Cosmology & Astronomy | Khan AcademyRefraction of Seismic Waves. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/t…
- 4 Feb 11, 8:31pm -
Why S-waves only travel in solids | Cosmology & Astronomy | Khan Academy
Why S-waves only travel in solids | Cosmology & Astronomy | Khan AcademyWhy S-Waves Only Travel in Solids. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-…
- 4 Feb 11, 7:16pm -
Seismic waves | Earth geological and climatic history | Cosmology & Astronomy | Khan Academy
Seismic waves | Earth geological and climatic history | Cosmology & Astronomy | Khan AcademyS-waves and P-waves. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-…
- 4 Feb 11, 7:05pm -
Compositional and mechanical layers of the earth | Cosmology & Astronomy | Khan Academy
Compositional and mechanical layers of the earth | Cosmology & Astronomy | Khan AcademyCrust, mantle, core, lithosphere, asthenosphere, mesosphere, outer core, inner core. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/s…
- 4 Feb 11, 6:04pm -
Hawaiian islands formation | Cosmology & Astronomy | Khan Academy
Hawaiian islands formation | Cosmology & Astronomy | Khan AcademyHawaiian Islands formed by stationary hot spot under Pacific plate. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-hi…
- 3 Feb 11, 7:18pm -
Plates moving due to convection in mantle | Cosmology & Astronomy | Khan Academy
Plates moving due to convection in mantle | Cosmology & Astronomy | Khan AcademyPlates Moving Due to Convection in Mantle. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topi…
- 3 Feb 11, 6:07pm -
Plate Tectonics-- Geological features of Convergent Plate Boundaries
Plate Tectonics-- Geological features of Convergent Plate BoundariesGeological features of Convergent Plate BoundariesMore free lessons at: http://www.khanacademy.org/video?v=Y0eWnOZpSpQFrom:Khan AcademyViews:112485 204ratingsTime:06…
- 3 Feb 11, 1:13am -
Plate tectonics: Difference between crust and lithosphere | Cosmology & Astronomy | Khan Academy
Plate tectonics: Difference between crust and lithosphere | Cosmology & Astronomy | Khan AcademyPlate Tectonics Introduction and Difference between crust and lithosphere. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/sc…
- 3 Feb 11, 1:01am -
Structure of the Earth
Structure of the EarthStructure of the Earth - crust, mantle, coreMore free lessons at: http://www.khanacademy.org/video?v=4AxZ-6MOznYFrom:Khan AcademyViews:189814 388ratingsTime:09:33More inEducation
- 2 Feb 11, 9:10pm -
Plate tectonics: Geological features of divergent plate boundaries | Khan Academy
Plate tectonics: Geological features of divergent plate boundaries | Khan AcademyPlate Tectonics -- Geological Features of Divergent Plate Boundaries. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-…
- 1 Feb 11, 11:50pm -
Plate tectonics: Evidence of plate movement | Cosmology & Astronomy | Khan Academy
Plate tectonics: Evidence of plate movement | Cosmology & Astronomy | Khan AcademyPlate Tectonics -- Evidence of plate movement. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-histor…
- 1 Feb 11, 9:40pm -
First living things on land clarification | Cosmology & Astronomy | Khan Academy
First living things on land clarification | Cosmology & Astronomy | Khan AcademyFirst living things on land clarification (This video copyrighted under Create Commons Attribution and Share-Alike CC-BY-SA license). Created by Sal Khan.Watch the…
- 24 Jan 11, 9:22pm -
Biodiversity flourishes in Phanerozoic eon | Cosmology & Astronomy | Khan Academy
Biodiversity flourishes in Phanerozoic eon | Cosmology & Astronomy | Khan AcademyCambrian explosion and biodiversity in the Phanerozoic Eon. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/…
- 21 Jan 11, 12:11am -
Ozone layer and eukaryotes show up in the Proterozoic eon | Cosmology & Astronomy | Khan Academy
Ozone layer and eukaryotes show up in the Proterozoic eon | Cosmology & Astronomy | Khan AcademyOzone layer and eukaryotes show up in the Proterozoic eon. Great oxygenation event (oxygen catastrophe). Created by Sal Khan.Watch the next lesson:…
- 20 Jan 11, 9:11pm -
Beginnings of life | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
Beginnings of life | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyLife and photosynthesis start to thrive in the Archean Eon. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-an…
- 20 Jan 11, 7:01pm -

Khan Academy - Cosmology and Astronomy 49-85

Carbon 14 dating 1 | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
Carbon 14 dating 1 | Life on earth and in the universe | Cosmology & Astronomy | Khan AcademyCarbon 14 Dating 1. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/measurin…
- 21 Oct 11, 5:52pm -
Galactic collisions | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Galactic collisions | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyCollision of the Milky Way Galaxy with Andromeda (forming "Milkomeda"). Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/c…
- 1 Dec 10, 12:09am -
Quasar correction | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Quasar correction | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyQuasar Correction. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/quasars/v/gal…
- 30 Nov 10, 9:21pm -
Quasars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Quasars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyQuasars. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/quasars/v/quasar-correction?utm_s…
- 30 Nov 10, 8:38pm -
Supermassive black holes | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Supermassive black holes | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademySupermassive Black Holes. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic…
- 30 Nov 10, 7:55pm -
Why gravity gets so strong near dense objects | Cosmology & Astronomy | Khan Academy
Why gravity gets so strong near dense objects | Cosmology & Astronomy | Khan AcademyWhy Gravity Gets So Strong Near Dense Objects. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/physics/cosmology-and-astronomy/ea…
- 30 Nov 10, 6:00pm -
Why cepheids pulsate | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Why cepheids pulsate | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyWhy Cepheids Pulsate. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/cepheid…
- 30 Nov 10, 5:06pm -
Cepheid variables 1 | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Cepheid variables 1 | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyCepheid Variables 1. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/cepheid-v…
- 30 Nov 10, 12:19am -
Black holes | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Black holes | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyBlack Holes. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutori…
- 29 Nov 10, 11:17pm -
Supernova clarification | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Supernova clarification | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademySupernova clarification. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/s…
- 29 Nov 10, 7:19pm -
Supernova (supernovae) | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Supernova (supernovae) | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademySupernova (Supernovae). Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/ste…
- 29 Nov 10, 7:18pm -
Lifecycle of massive stars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Lifecycle of massive stars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyLifecycle of Massive Stars. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-t…
- 29 Nov 10, 6:47pm -
Hubble's law | Scale of the universe | Cosmology & Astronomy | Khan Academy
Hubble's law | Scale of the universe | Cosmology & Astronomy | Khan AcademyHubble's Law. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/a-un…
- 24 Nov 10, 8:14pm -
Parsec definition | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Parsec definition | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyParsec Definition. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/cepheid-varia…
- 24 Nov 10, 7:15pm -
Stellar parallax clarification | Cosmology & Astronomy | Khan Academy
Stellar parallax clarification | Cosmology & Astronomy | Khan AcademySupermassive Black Holes. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/physics/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v…
- 24 Nov 10, 6:37pm -
Stellar distance using parallax | Cosmology & Astronomy | Khan Academy
Stellar distance using parallax | Cosmology & Astronomy | Khan AcademyStellar Distance Using Parallax. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-parallax-tu…
- 24 Nov 10, 6:26pm -
Parallax in observing stars | Cosmology & Astronomy | Khan Academy
Parallax in observing stars | Cosmology & Astronomy | Khan AcademyParallax in Observing Stars. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-parallax-tutorial/v…
- 24 Nov 10, 6:25pm -
Star field and nebula images | Cosmology & Astronomy | Khan Academy
Star field and nebula images | Cosmology & Astronomy | Khan AcademyStar Field and Nebula Images. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutori…
- 24 Nov 10, 12:02am -
White and black dwarfs | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
White and black dwarfs | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyWhite and Black Dwarfs. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/ste…
- 23 Nov 10, 10:24pm -
Becoming a red giant | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Becoming a red giant | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyBecoming a Red Giant. Created by Sal KhanWatch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-…
- 23 Nov 10, 9:56pm -
Birth of stars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
Birth of stars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan AcademyBirth of Stars. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-…
- 23 Nov 10, 7:33pm -
Cosmic background radiation 2 | Scale of the universe | Cosmology & Astronomy | Khan Academy
Cosmic background radiation 2 | Scale of the universe | Cosmology & Astronomy | Khan AcademyCosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/scie…
- 23 Nov 10, 5:35pm -
Cosmic background radiation | Scale of the universe | Cosmology & Astronomy | Khan Academy
Cosmic background radiation | Scale of the universe | Cosmology & Astronomy | Khan AcademyCosmic Background Radiation. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/b…
- 23 Nov 10, 5:03pm -
Four fundamental forces | Scale of the universe | Cosmology & Astronomy | Khan Academy
Four fundamental forces | Scale of the universe | Cosmology & Astronomy | Khan AcademyGravity, Weak, Electromagnetic and Strong. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-sca…
- 22 Nov 10, 5:27pm -
Cosmological time scale 2 | Scale of the universe | Cosmology & Astronomy | Khan Academy
Cosmological time scale 2 | Scale of the universe | Cosmology & Astronomy | Khan AcademyCosmological Time Scale 2. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/light…
- 20 Nov 10, 12:22am -
Cosmological time scale 1 | Scale of the universe | Cosmology & Astronomy | Khan Academy
Cosmological time scale 1 | Scale of the universe | Cosmology & Astronomy | Khan AcademyCosmological Time Scale 1. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/cosmo…
- 19 Nov 10, 8:46pm -
Red shift | Scale of the universe | Cosmology & Astronomy | Khan Academy
Red shift | Scale of the universe | Cosmology & Astronomy | Khan AcademyCreated by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/cosmic-background-rad…
- 19 Nov 10, 5:51pm -
Intergalactic scale | Scale of the universe | Cosmology & Astronomy | Khan Academy
Intergalactic scale | Scale of the universe | Cosmology & Astronomy | Khan AcademyIntergalactic Scale. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth-galax…
- 19 Nov 10, 12:26am -
Hubble image of galaxies | Scale of the universe | Cosmology & Astronomy | Khan Academy
Hubble image of galaxies | Scale of the universe | Cosmology & Astronomy | Khan AcademyHubble Image of Galaxies. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/physics/cosmology-and-astronomy/stellar-life-topic/s…
- 19 Nov 10, 12:26am -
Radius of observable universe | Scale of the universe | Cosmology & Astronomy | Khan Academy
Radius of observable universe | Scale of the universe | Cosmology & Astronomy | Khan AcademyRadius of Observable Universe. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-top…
- 19 Nov 10, 12:26am -
Big bang introduction | Scale of the universe | Cosmology & Astronomy | Khan Academy
Big bang introduction | Scale of the universe | Cosmology & Astronomy | Khan AcademyCreated by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/radius-of…
- 19 Nov 10, 12:26am -
Radius of observable universe (correction) | Cosmology & Astronomy | Khan Academy
Radius of observable universe (correction) | Cosmology & Astronomy | Khan Academy(Correction) Radius of Observable Universe. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-t…
- 19 Nov 10, 12:26am -
A Universe Smaller than the Observable
A Universe Smaller than the ObservableA Universe Smaller than the ObservableMore free lessons at: http://www.khanacademy.org/video?v=0w9R_foNLrgFrom:Khan AcademyViews:103802 452ratingsTime:08:58More inEducation
- 19 Nov 10, 12:26am -
Scale of the galaxy | Scale of the universe | Cosmology & Astronomy | Khan Academy
Scale of the galaxy | Scale of the universe | Cosmology & Astronomy | Khan AcademyScale of the Galaxy. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth-galax…
- 17 Nov 10, 8:13pm -
Scale of distance to closest stars | Scale of the universe | Cosmology & Astronomy | Khan Academy
Scale of distance to closest stars | Scale of the universe | Cosmology & Astronomy | Khan AcademyScale of Distance to Closest Stars. Created by Sal Khan.Watch the next lesson:https://www.khanacademy.org/science/cosmology-and-astronomy/universe-…
- 16 Nov 10, 10:32pm -
Scale of earth and sun | Scale of the universe | Cosmology & Astronomy | Khan Academy
Scale of earth and sun | Scale of the universe | Cosmology & Astronomy | Khan AcademyScale of Earth and Sun. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth…
- 16 Nov 10, 10:32pm -
Scale of solar system | Scale of the universe | Cosmology & Astronomy | Khan Academy
Scale of solar system | Scale of the universe | Cosmology & Astronomy | Khan AcademySal Khan describes the scale of our Solar System. Created by Sal Khan and NASA.Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronom…
- 16 Nov 10, 10:32pm -