Earth's neighbor Mars likely once had an environment that could have supported life. Now it has underground frozen water in many places. Spacecraft from Earth h

Our solar system used to have nine planets. But recently, scientists ruled that Pluto was actually a "dwarf planet." So what exactly is a dwarf planet, how many

Utilizes a travel guide format to bring together recent scientific discoveries about Mars, describing such features as its dry riverbeds, huge volcano, possible

Jupiter is bigger than any other planet in our solar system. It has rings and centuries-old storms. It has more than sixty moons, too—some with underground oc

Have you ever seen a comet or a shooting star? You may think they look pretty, but these giant space rocks can cause major destruction. Scientists keep a close