walter-baade

walter baade

How Far Are the Stars? (part 3)
April 29, 2011 · Be The First To Comment

In my last post, I showed how Cepheid variables allow us measure distances to distant stars and even to other galaxies. However, there is a limit to how far we can measure using Cepheids.  To measure the distance to the farthest galaxies, it takes a standard candle much brighter than a Cepheid. It takes a […]

How Far are the Stars? (part 2)
March 29, 2011 · Be The First To Comment

A few months ago, I shared with you how astronomers measure distances to the nearest stars using simple geometry. I also pointed out, however, that we can measure only our small neighborhood using the geometric method we call parallax. How then, can we possibly know the distances of stars even farther out? Well, we all […]



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George Observatory

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