Star+Videos

[|David Christian on formation of stars] [|David Christian on Threshold 2: stars light up]

Learn how gravity creates each level of structure:
 * 1) star structure
 * 2) galaxy structure
 * 3) cluster structure
 * 4) super clusters

[|David Christian what did stars give us?] Where does carbon come from?

[|David Christian on what did stars give us?] Where does iron come from? Where does uranium come from?

[|Sal Khan on our milky way galaxy] If there was life in Andromeda galaxy, how many years would it take for us to send them a message?

[|Sal Khan on the Hubble Telescope] [|Check out the Hubble images] Did it blow your mind?