What is the lifespan of the Earth compared to that of the Milky Way Galaxy?
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One orbital period (one galactic year) is equal to about 250 million years. We have completed about 15 orbits since life started on Earth. The Milky Way itself is about 100,000 light-years across and is home to about 400 billion stars. ... The Milky Way has a halo of dark matter that makes up over 90% of its mass.
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