A satellite is any object that moves around another object. The Moon is a natural (not created by human beings) satellite of Earth.

Over the past fifty years, we have figured out how to make new Earth satellites. Since the 1957 Sputnik 1, thousands of satellites have been launched and many are still in orbit around Earth.

Satellites provide us with information about the universe that could not be obtained from ground-based observations. They also give us a perspective of our own planet. They are responsible for taking pictures of the Earth's weather that we see on the evening news, and they make it possible for us to watch events on T.V. that are happening on the other side of the world.

Last modified February 4, 2008 by Becca Hatheway.

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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