The weight of the Milky Way is in the whirling
Combining data from 46 globular star clusters, astronomers arrived at a figure for the mass of the Milky Way: about 1.5 trillion times that of the Sun
About 90% of the mass of Milky Way, and of the entire universe, is actually invisible to us. Remember what you can’t see is far more than what you can
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In my last column, I mentioned something we all did as kids: tie a stone to the end of a piece of string and whirl it around our heads. In that column, I used that memory as an analogy to a spacecraft orbiting the Earth. Our planet’s gravity is like...
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