Lurking further from its stars than Neptune is from the Sun, this is no inner planet, but it’s on a scale we recognize, ...

Fans of David Attenborough are accustomed to viewing the famed English broadcaster’s nature documentaries in two dimensions—often, on the television screens in their living rooms. Now, they have a ...

How old is Earth? Our planet's age is known from a variety of sources, from rocks on our own planet to ones from the moon. When you purchase through links on our site, we may earn an affiliate ...

With J.R.R. Tolkien's high-fantasy world of Middle-earth being so far removed from our own, it's easy to get so caught up in what's on the map itself that we rarely even think about what's not on it.

When the 3 rd -century Christian theologian Origen of Alexandria attempted to account for the unusual movements of the Star ...

For centuries our solar system was the only planetary system known to humans. We had no proof other worlds existed beyond those in our own cosmic backyard, and we imagined that if other planetary ...