00:00On this day in space.
00:03In 1612, the Andromeda Galaxy was seen through a telescope for the first time
00:08by a German astronomer named Simon Marius.
00:11The Andromeda Galaxy is the closest major galaxy to the Milky Way
00:14and it can be seen with the naked eye.
00:16Early astronomers thought it was a nebula or a glowing cloud of space dust.
00:21Even after Simon Marius saw it through a telescope for the first time,
00:24he still couldn't tell that it was actually a galaxy filled with about a trillion stars.
00:29It took another 300 years before Edwin Hubble came along
00:32and figured out that it was a galaxy.
00:34And that's what happened on this day in space.
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