Messages in a meteorites bring news from outer space
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Meteorites may make us think of images of giant rocks smashing into towns. In fact, meteorites rarely hit people. They regularly bring valuable materials to Earth from outer space.
All of the iron we use on Earth today was brought from meteorites. Gold and platinum even have meteorite origins.
Meteorites have been hurtling to Earth since its formation. That was nearly 4.6 billion years ago. This was way before humans evolved. Without meteorites, our planet would be a very different place in terms of minerals available for our use.
Meteorites are valuable not only as sources of minerals. They also contain information. A meteorite is a space-time messenger from our solar system. It was chipped off an asteroid or other orbiting body. It may hang around in orbit for thousands or millions of years. That's before it gets thrown to Earth. It carries a story of events and conditions in space. They are otherwise difficult to study.
Using sophisticated technology to analyze the chemistry of meteorites, scientists find materials pointing back as far as the formation of our universe. These discoveries set the stage for planning spacecraft missions. Meteorites from Mars inspired a series of missions to explore the possibility of life on the red planet.
Find out more about meteorites and the solar system. Join us on Thursday, June 25, 2015, for a Smithsonian Science How live webcast. It's titled Astrogeology: Meteorites and Spacecraft Missions. It airs at 11 a.m. and 2 p.m. EDT on the Q?rius website.
Meteoriticist Dr. Tim McCoy from the National Museum of Natural History will appear live. He will discuss and answer questions. Get teaching resources to support your webcast experience.
Critical thinking challenge: How is a meteorite a space-time messenger?