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27 votes
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Why are there so few supernovae in M31 (Andromeda)?

The low supernova rate in M31 can be directly attributed to the fact that the galaxy's star formation rate is much lower than the Milky Way's. Andromeda is currently in a relatively quiet phase in ...
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14 votes
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Has the great Andromeda Galaxy ever collided with any galaxies?

Galaxies grow through cosmic time by accretion of the surrounding matter. Some of its mass increase happens through smooth accretion of gas, but much also happens through merging with small clumps of ...
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11 votes
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How much overlap will the Andromeda galaxy and the Milky Way have when they collide?

This page, from June 2012, contains a fairly detailed summary of three papers that considered the tangential velocity and collision problem. I'll quote a few choice bits from that page: Andromeda (...
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6 votes
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Fate of the Spiral Arms of the Milky Way and Andromeda

It indeed appears the Andromeda galaxy (M31) and The Milky Way (MW) are en route to a collision. This will lead to a merger of the two galaxies forming an elliptical galaxy. The flattened disc ...
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3 votes

Fate of the Spiral Arms of the Milky Way and Andromeda

In a few billion years, the Milky Way and Andromeda will collide. About 5 billion years, but it will take more than a thousand years for the galaxies to overlap. Chances are, there won't be any ...
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1 vote
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What parameters determine whether galaxies colliding will result in a merger or a hit and run?

The main factor is the velocity of the encounter. The higher the relative velocity between the two galaxies, the easier it is for them to pass through each other without being slowed down enough for a ...
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1 vote
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What is the brightest star (relative magnitude) in M31?

The Variable stars that Hubble studied in M31 when he showed that it was a galaxy are among the most luminous. They include Var-A1, a luminous blue variable, and magnitude about 16.5. Var A-1 is one ...
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