We have just entered a very favorable period for observing the so-called "elusive" planet Mercury. From now, until about May 13, you should be able to find it with not much difficulty. But how well do ...

Ah, Earth. We may not think about our planet on a day-to-day basis, but the world we live in is a pretty interesting place. The third rock from the Sun—and to this day, the only one with known ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Buzz Aldrin set foot on the moon, and his new book encourages kids to take the first steps onto ...