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Our Glaciers: Then and Now activity kit helps you see the changes taking place in glaciers around the world. See all our activity kits and classroom activities.

Solar System Coloring Book--Comets

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Location: At the outer edge of the solar system, in the Oort cloud

Number: Millions of them

Famous Comet: Halley's comet returns to Earth every 76 years.

Comets are huge dirty snowballs that are found in the farthest parts of the solar system. Comets are made of ice, dust, and small chunks of rock. Some comets come into the inner solar system every few hundred years and travel around the Sun. As they get close to the Sun, they give off gas that forms into a long tail that can reach across the sky when seen from Earth.

Other Coloring Books:

Sun | Mercury | Venus | Earth | Mars | Asteroids | Jupiter | Saturn | Uranus | Neptune | Pluto | Comets

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Learn about Earth and space science, and have fun while doing it! The games section of our online store includes a climate change card game and the Traveling Nitrogen game!

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA