Have you ever wondered how astronomers measure the distance to other objects in the universe? How do they make claims that this nebula is 1,500 light years distance or that galaxy is 2.5 million light ...

n nearly nine years of writing this column, I’ve rattled off distances to many stars and galaxies. The distances are so great that miles are too cumbersome to express them. Light-years do a better job ...

This is a classic example of parallax (although this is fake parallax). You can create another example of parallax yourself. Hold you thumb out straight in front of your face at arms length. Now close ...

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