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How Long is a Day on Earth?

I'm going to ask you how long a day is on Earth, and you're going to get the haunting suspicion…

5 years ago

What Are The Most Famous Stars?

While there are untold billions of celestial objects visible in the nighttime sky, some of them are better known than…

6 years ago

Star Trail Photo Hints at Hidden Polestars

A week ago I made a 45-minute time exposure of the southern sky featuring the planet Mars. As the Earth…

7 years ago

The Little Cepheid that Stopped

[/caption] When Hubble first discovered a Cepheid variable in the galaxy M31, the universe grew. Previously, many astronomers had held…

10 years ago