https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/red-shift 2021-07-06T13:18:38Z Red shift Sal Khan video https://cdn.kastatic.org/googleusercontent/qqAaP_iLY2zBDup91m_GTO5BovIpTu0ef42JQSvX7bmu8szu5QNMMlvU_B5TYavRHE-zfU8qu7X1Q0UWCyrq5Xut Red shift https://cdn.kastatic.org/ka-youtube-converted/mx2M_ZKXM_c.mp4/mx2M_ZKXM_c.mp4 604 Rredshift, hubble’s law, and the expanding universe https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/cosmic-background-radiation 2021-04-04T12:52:26Z Cosmic background radiation Cosmic Background Radiation Sal Khan video https://cdn.kastatic.org/googleusercontent/bb1wjqpO1-nYP4hdh1LWTdbilRmgrdlof1tQpMZN9IsKOYlYKXSlozkfSsCQbfxdyncQJn-5QovrGQVbAVHi1Y1WBQ Cosmic background radiation Cosmic Background Radiation https://cdn.kastatic.org/ka-youtube-converted/sxbPwl_KRuA.mp4/sxbPwl_KRuA.mp4 696 Rredshift, hubble’s law, and the expanding universe https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/cosmic-background-radiation-2 2021-04-04T12:52:27Z Cosmic background radiation 2 Cosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation Sal Khan video https://cdn.kastatic.org/googleusercontent/wjH6OMSDu7KDWNf4gzu7aOplgfAVDpaJhup1UpmpTekzL4mJ_I4Ssc7gMArar4Mqu0_JaCfKfY2hjicN9VZSbGM Cosmic background radiation 2 Cosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation https://cdn.kastatic.org/ka-youtube-converted/06z7Q8TWPyU.mp4/06z7Q8TWPyU.mp4 615 Rredshift, hubble’s law, and the expanding universe https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/hubble-s-law 2021-04-04T12:52:27Z Hubble's law Hubble's Law Sal Khan video https://cdn.kastatic.org/googleusercontent/jhx5YsevdDnSwLeimLCzPg55UetKDlLZlY2v6ACt7YK0DOpPc0gs5c6YQ0iAen-hhYe-w2idrYNcXqvLGmjK22fsUA Hubble's law Hubble's Law https://cdn.kastatic.org/ka-youtube-converted/1V9wVmO0Tfg.mp4/1V9wVmO0Tfg.mp4 672 Rredshift, hubble’s law, and the expanding universe https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/a-universe-smaller-than-the-observable 2021-04-04T12:52:27Z A universe smaller than the observable A Universe Smaller than the Observable Sal Khan video https://cdn.kastatic.org/googleusercontent/3C4KVDPpzS83FP4ZHFN2rICvBB6mOUNkMk_d34f2mHXEIs6lMl8QBNR_Ynjd8P3azdvDWyfc4_gwl4iUbwkXn7POvg A universe smaller than the observable A Universe Smaller than the Observable https://cdn.kastatic.org/ka-youtube-converted/0w9R_foNLrg.mp4/0w9R_foNLrg.mp4 538 Rredshift, hubble’s law, and the expanding universe https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/a/how-can-the-universe-be-infinite-if-it-started-expanding-138-billion-years-ago 2021-04-29T07:50:49Z How can the universe be infinite if it started expanding 13.8 billion years ago? article https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/big-bang-introduction 2021-04-04T12:52:27Z Big bang introduction Sal Khan video https://cdn.kastatic.org/googleusercontent/yS3isbJgQeGzBD2vA3nsZb49qvokvWETy54AlwE_N_Jhc0ZJJrs0Wk2zS2ltwo39kCvOIzaKRDsldX2D0Boyr7k Big bang introduction https://cdn.kastatic.org/ka-youtube-converted/eUF59jCFcyQ.mp4/eUF59jCFcyQ.mp4 663 Rredshift, hubble’s law, and the expanding universe