Milky Way Weigh

Misanthropist
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spectroscopy perhaps? determine the matter which is there and add up the mass under the conditions. Not 100% accurate i would imagine, but still interesting data.
 
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spectroscopy perhaps? determine the matter which is there and add up the mass under the conditions. Not 100% accurate i would imagine, but still interesting data.
"The new estimate is based on a large sample of stars in the galactic halo, a relatively sparse sphere of stars that surrounds our galaxy's main disk. The speeds of stars in the halo reveal the mass of the galaxy by allowing astrophysicists to infer the amount of gravity required to keep those stars in orbit."
 
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aah so just inferred physics. Makes sense, much much less to compute.
 

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