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

DILIP D’SOUZA Respond to this column at

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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