Summary
Astronomers have measured that its star formation rate has been steadily decreasing.
This decline has been observed over the past 40 million years.
Key Points
4 points1
Andromeda is a nearby galaxy to our own.
2
It is entering the middle phase of its life cycle.
3
The creation of new stars is slowing down.
4
The slowdown spans about 40 million years.
New Words to Learn
5 wordsAndromeda
the name of a large galaxy close to the Milky Way
galaxy
a massive system of stars, gas, and dust held together by gravity
middle age
the stage between a galaxy's early growth and its old age
star formation rate
the speed at which new stars are being born
million years
a period of one million years
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