polaris

Polaris, Earth’s North Star, Has A Surprisingly Spotted Surface

Humanity's been fortunate to have a star situated over Earth's north pole. The star, known as Polaris, or the North…

3 months ago

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

9 years ago

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

10 years ago

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

11 years ago

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

14 years ago