Home > School and Learning > By Subject > Science and Health > Astronomy > Moons of the Solar System

Slideshow Iconslideshows MORE


Moons of the Solar System

2 of 10


Orbiting Mars are two moons, Phobos and Deimos. This is a picture of the largest of the two moons, Phobos, which comes from the Greek word for fear. Phobos is only 17 miles across, and its orbit around Mars is only 8 hours long, zipping across the sky from the western horizon to the eastern horizon.

Fun Fact: Phobos is doomed. In 100 million years Phobos will either crash into Mars or break up as it's dragged down by the planet's gravity. The current distance between Phobos and the surface of Mars is about 3,600 miles, compared to 250,000 miles between the surface of the Earth and its Moon.

Photo source: NASA

Next: Callisto


Provided by Infoplease—an authoritative, comprehensive reference website that offers an encyclopedia, a dictionary, an atlas, and several almanacs. Visit Infoplease.com to find more resources endorsed by teachers and librarians.


Top 2015 Halloween Costumes for Kids
Will your child transform into a dinosaur, a superhero, or the latest Disney princess on October 31? Take a look at 2015's hottest Halloween costumes for boys and girls of all ages!

Find Today's Newest & Best Children's Books!
Looking for newly released books for your child? Try our new Book Finder tool to search for new books by age, type, and theme, and create reading lists for kids!

8 Not-Too-Spooky Halloween Activities for Kids
Halloween can be too scary and gory for preschoolers and kids of all ages. Find non-scary Halloween activities and party ideas that make this creepy holiday more kid-friendly.

Ready for Kindergarten?
Try our award-winning Kindergarten Readiness app! This easy-to-use checklist comes with games and activities to help your child build essential skills for kindergarten. Download the Kindergarten Readiness app today!

stay connected

Sign up for our free email newsletters and receive the latest advice and information on all things parenting.

Enter your email address to sign up or manage your account.

Facebook icon Facebook icon Follow Us on Pinterest

editor’s picks