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…

2 months ago

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…

9 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…

10 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…

10 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…

14 years ago