Planetariums around the world are invited to participate in this year’s edition of the IAU’s annual outreach event.

A full moon is slated for Sept. 7, but there are other celestial events occurring this month. More on viewing Saturn at its ...

The “Blood Moon” will be visible across India, Asia, parts of Africa, and Europe. However, people on both Americas will not ...

At incredibly small scales, the universe operates according to the unfamiliar rules of quantum mechanics. And Planck’s constant is in charge.

Before defining what a light-year is, we should define what a light-year is not: It is not a measure of time, but rather a measure of distance ...

It's … the Eye of Sauron! Well, sort of. Though the image you're seeing bears a striking resemblance to the jarring symbol ...