How Big Is Andromeda, Really?
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YouTubeThe Sleepy Scientist
How Big Is Andromeda, Really?
Andromeda appears calm and distant in the night sky, yet its true scale reaches far beyond what light alone reveals. This video explores how astronomers measure the size of a galaxy, from visible stars and faint halos to gravity, motion, and time itself. What begins as a simple question gradually reveals how large spiral galaxies are understood ...
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Close-up: Andromeda Galaxy (M31) | Subaru Telescope FriendsofNASA.org: The Andromeda Galaxy (M31) captured by the Hyper Suprime-Cam (HSC), a wide-field optical imaging camera. HSC offers an ultra-wide field of view equivalent to nine full Moons, covering nearly the entire Andromeda Galaxy. These pictures show how the Subaru Telescope and HSC work together to provide a wide field of view and sharp star images. The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the M
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On Dec. 15, 1612, the Andromeda galaxy was seen through a telescope for the first time by a German astronomer named Simon Marius. Space History Archives👉 https://space-com.visitlink.me/SZfKcV The Andromeda galaxy is the closest major galaxy to the Milky Way, and it can be seen with the naked eye. Early astronomers thought it was a nebula, or a glowing cloud of space dust. Even after Simon Marius saw it through a telescope for the first time, he still couldn't tell that it was actually a galaxy
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