Each asteroid and comet is unique. But what makes them unique, and why are these space objects so interesting to scientists? Learn about the first spacecraft to visit an asteroid, what gives a comet its tails, and much more!

About the Author

Dr. Bruce Betts is Chief Scientist and LightSail Program Manager for The Planetary Society, the world's largest space interest group. Dr. Betts is a planetary scientist who earned a B.S. in physics and math and an M.S. in Applied Physics from Stanford and a Ph.D. in Planetary Science with a minor in Geology from Caltech. He spent several years with San Juan Institute/Planetary Science Institute as a Research Scientist, and later Senior Research Scientist. Dr. Betts is the author of Astronomy for Kids: How to Explore Outer Space with Binoculars, a Telescope, or Just Your Eyes! He regularly writes for The Planetary Society member magazine The Planetary Report, and on his blog on planetary.org.

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