Asteroids, comets, meteorites—what’s the difference? This list from NASASolarSystem will help you tell these small bodies apart. Let’s (space) rock:
are rocky, airless worlds that orbit our Sun. They are remnants left over from the formation of our solar system, ranging in size from the length of a car to about as wide as a large city. Asteroids are diverse in composition; some are metallic while others are rich in carbon, giving them a coal-black color. They can be “rubble piles,” loosely held together by their own gravity, or they can be solid rocks.
Other asteroids follow different orbits, including some that enter Earth’s neighborhood. These are called near-Earth objects, or NEOs. We can actually keep track of the ones we have discovered and predict where they are headed. The Minor Planet Center and Jet Propulsion Laboratory’s Center for Near Earth Object Studies do that very thing.
Comet 67P/Churyumov-Gerasimenko as seen by ESA's Rosetta spacecraft on Sept. 29, 2016, when Rosetta was at an altitude of 14 miles . The Rosetta mission ended the next day with a controlled touchdown of the spacecraft on the comet. Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA |On July 4, 2005, NASA crashed a washing machine-sized probe into a comet the size of Manhattan.
This photograph, taken by an astronaut aboard the International Space Station, provides the unusual perspective of looking down on a meteor as it passes through Earth's atmosphere. The image was taken on Aug. 13, 2011, during the Perseid Meteor Shower that occurs every August. Image credit: NASAare meteoroids that fall through Earth’s atmosphere at extremely high speeds.
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