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Astronomers Just Realized The Milky Way Is Too Big For Its Surroundings - ScienceAlert

Astronomers Just Realized The Milky Way Is Too Big For Its Surroundings - ScienceAlert

Astronomers Just Realized The Milky Way Is Too Big For Its Surroundings - ScienceAlert
Jan 24, 2023 47 secs

This flattened arrangement of galaxies share similar velocities, bounded by relatively empty space called voids on either side.

The relationship between the galaxies in the Local Sheet seems to exert a strong influence over their behavior; for example, their similar velocities relative to the expansion of the Universe.

There are lots of spiral galaxies that look roughly like it," says astronomer Joe Silk of Sorbonne University's Institut d'Astrophysique de Paris in France.

Because the team's simulations only considered the Milky Way's context within a cosmological wall, perhaps future work could account for more galaxies within the Local Group.

The researchers also note that the environmental context could help explain some previously unexplained phenomena, such as the unusual arrangement of satellite galaxies around Andromeda, and the peculiar lack of them around the Milky Way.

"You do have to be careful … choosing properties that qualify as 'special'," says astronomer Mark Neyrinck of the Basque Foundation for Science in Spain.

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