Andromeda galaxy

The Andromeda galaxy is a spiral galaxy found about 2 million lightyears from our own galaxy, The Milky Way.^[1] These two galaxies are the two largest galaxies in The local group -- the several dozen nearby galaxies moving towards one another, due to gravitational attraction.

Andromeda made Messier's list. It was the 31st object in the sky hhe recorded, that looked like a comet. He kept track of these objects to make sure he didn't try to track them, as if they were comets.

References

↑ ^1.0 ^1.1 "Apocalypse When? Hubble Casts Doubt on Certainty of Galactic Collision". NASA Science. 2025-06-02. Archived from the original on 2025-06-02. Retrieved 2026-07-14. But now a new study using data from Hubble and the European Space Agency’s (ESA) Gaia space telescope says “not so fast.” Researchers combining observations from the two space observatories re-examined the long-held prediction of a Milky Way – Andromeda collision, and found it is far less inevitable than astronomers had previously suspected.

[NASA-Science-2025-06-02-1] 1.0 ^1.1 "Apocalypse When? Hubble Casts Doubt on Certainty of Galactic Collision". NASA Science. 2025-06-02. Archived from the original on 2025-06-02. Retrieved 2026-07-14. But now a new study using data from Hubble and the European Space Agency’s (ESA) Gaia space telescope says “not so fast.” Researchers combining observations from the two space observatories re-examined the long-held prediction of a Milky Way – Andromeda collision, and found it is far less inevitable than astronomers had previously suspected.

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