https://www.khanacademy.org/science/grade-7-science-cambridge-curriculum/x754b285620daf71e:earth-and-space/x754b285620daf71e:space/v/what-is-the-milky-way-galaxy 2025-12-02T18:10:41.506336784Z What is the Milky Way Galaxy? From Earth, the Milky Way Galaxy looks like a river of stars. But we’re also spinning through it! With hundreds of millions of stars, the Milky Way contains a vast array of other solar systems that are constantly in motion. And from where we are on the outer edge of the galaxy, there's a lot that we can't see. Music Credits: "Mistake" by Terry Day (PRS)/Warner Chappell Production Music "Take It Easy" by Anthony Young (PRS)/Warner Chappell Production Music All other imagery © American Museum of Natural History. American Museum of Natural History video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw What is the Milky Way Galaxy? From Earth, the Milky Way Galaxy looks like a river of stars. But we’re also spinning through it! With hundreds of millions of stars, the Milky Way contains a vast array of other solar systems that are constantly in motion. And from where we are on the outer edge of the galaxy, there's a lot that we can't see. Music Credits: "Mistake" by Terry Day (PRS)/Warner Chappell Production Music "Take It Easy" by Anthony Young (PRS)/Warner Chappell Production Music All other imagery © American Museum of Natural History. https://cdn.kastatic.org/ka-youtube-converted/ekWc1wY24XQ.mp4/ekWc1wY24XQ.mp4 356 Space https://www.khanacademy.org/science/grade-7-science-cambridge-curriculum/x754b285620daf71e:earth-and-space/x754b285620daf71e:space/v/why-is-everything-in-the-universe-always-moving 2025-12-02T18:10:41.506336784Z Why is everything in the universe always moving? When you look up at the stars from here on Earth, it's hard to believe that they are all in motion, all the time. And it's not just the stars, everything--from planets, to stars, to galaxies--are all moving and have been since the Big Bang. We know all this because telescopes on Earth and in space help us see things that are impossible to see with our eyes. Archive Credits: © ESA - European Space Agency Johnson Space Center/NASA NASA NASA, ESA, CSA, Anne-Marie Lagrange (CNRS, UGA), Mahdi Zamani (ESA/Webb) NASA, ESA, CSA, STScI NASA, ESA, CSA, STScI, Olivia Jones (UK ATC), Guido De Marchi (ESTEC), Margaret Meixner (USRA) NASA Goddard LSST Project Office Rubin Obs/NSF/AURA/O. Rivera Rubin Obs/NSF/DOE/NOIRLab/SLAC/AURA/H. Stockebrand Music Credits: "Mistake" by Terry Day (PRS)/Warner Chappell Production Music All other imagery © American Museum of Natural History. American Museum of Natural History video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Why is everything in the universe always moving? When you look up at the stars from here on Earth, it's hard to believe that they are all in motion, all the time. And it's not just the stars, everything--from planets, to stars, to galaxies--are all moving and have been since the Big Bang. We know all this because telescopes on Earth and in space help us see things that are impossible to see with our eyes. Archive Credits: © ESA - European Space Agency Johnson Space Center/NASA NASA NASA, ESA, CSA, Anne-Marie Lagrange (CNRS, UGA), Mahdi Zamani (ESA/Webb) NASA, ESA, CSA, STScI NASA, ESA, CSA, STScI, Olivia Jones (UK ATC), Guido De Marchi (ESTEC), Margaret Meixner (USRA) NASA Goddard LSST Project Office Rubin Obs/NSF/AURA/O. Rivera Rubin Obs/NSF/DOE/NOIRLab/SLAC/AURA/H. Stockebrand Music Credits: "Mistake" by Terry Day (PRS)/Warner Chappell Production Music All other imagery © American Museum of Natural History. https://cdn.kastatic.org/ka-youtube-converted/ZXDwL6zrwSo.mp4/ZXDwL6zrwSo.mp4 407 Space https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/quasars/v/galactic-collisions 2021-03-31T16:14:53Z Galactic collisions Collision of the Milky Way Galaxy with Andromeda (forming "Milkomeda") Sal Khan video https://cdn.kastatic.org/googleusercontent/ozE46jKHKSeZDT1kbOq50JJFgC859uIb7Cdalmmv0Vj8G5AIfCP6cWSOd3pyGNI9x6HuN7Tm18h4gGc98se53G3l Galactic collisions Collision of the Milky Way Galaxy with Andromeda (forming "Milkomeda") https://cdn.kastatic.org/ka-youtube-converted/QXYbGZ3T3_k.mp4/QXYbGZ3T3_k.mp4 214 Space https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth-galaxy-tutorial/v/scale-of-the-galaxy 2021-03-31T16:14:53Z Scale of the galaxy Scale of the Galaxy Sal Khan video https://cdn.kastatic.org/googleusercontent/5bqpZvuZf0L9tksfw9QkD1WtV3sp-kv874OTEhVpELBL3IO-sc059k1vO5Vm43NVGepRKEdf1Za5I44NkHGH1xfA Scale of the galaxy Scale of the Galaxy https://cdn.kastatic.org/ka-youtube-converted/rcLnMe1ELPA.mp4/rcLnMe1ELPA.mp4 775 Space https://www.khanacademy.org/science/ka-science-grade-6/x12c13c153ec99496:beyond-earth/x12c13c153ec99496:the-galaxy/a/what-is-a-galaxy 2025-05-30T05:36:16.508578301Z What Is a Galaxy? article https://www.khanacademy.org/science/grade-7-science-cambridge-curriculum/x754b285620daf71e:earth-and-space/x754b285620daf71e:space/a/other-galaxy-classifications 2025-11-18T19:31:12.037809628Z Other Galaxy Classifications article https://www.khanacademy.org/science/grade-7-science-cambridge-curriculum/x754b285620daf71e:earth-and-space/x754b285620daf71e:space/a/interacting-galaxies 2025-11-18T19:31:12.037809628Z Interacting Galaxies article https://www.khanacademy.org/science/grade-7-science-cambridge-curriculum/x754b285620daf71e:earth-and-space/x754b285620daf71e:space/a/exploration-questions-galaxies 2025-07-02T11:57:34.440085533Z Exploration Questions: Galaxies article https://www.khanacademy.org/science/grade-7-science-cambridge-curriculum/x754b285620daf71e:earth-and-space/x754b285620daf71e:space/a/answers-to-exploration-questions-galaxies 2025-07-02T11:57:34.440085533Z Answers to Exploration Questions: Galaxies article https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/star-field-and-nebula-images 2021-04-04T12:52:27Z Star field and nebula images Star Field and Nebula Images Sal Khan video https://cdn.kastatic.org/googleusercontent/WxTg37Lua4UNqa0A4sowDbUUvSl8XJuHa_wfkS0MhUXGJVJtsJ4cF9iV1yfgz2AHaP1Ml53oSaOQLteExzqNXGUg Star field and nebula images Star Field and Nebula Images https://cdn.kastatic.org/ka-youtube-converted/w3IKEa_GOYs.mp4/w3IKEa_GOYs.mp4 424 Space https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth-galaxy-tutorial/v/intergalactic-scale 2021-03-31T16:14:53Z Intergalactic scale Intergalactic Scale Sal Khan video https://cdn.kastatic.org/googleusercontent/FaFcyQP8HpAqDNnh5DC9eZliozYt44ik1AFp57KBRrqaD00muwrTBW9dyfnWKXPxPe41MFwy8q9ol7bh_L8TgK221A Intergalactic scale Intergalactic Scale https://cdn.kastatic.org/ka-youtube-converted/JiE_kNk3ucI.mp4/JiE_kNk3ucI.mp4 650 Space