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Hot Topic Solar System Meteorites, Comets and Asteroids
Meteorites Most Likely Source of Earth's Water
Topic: Meteorites, Comets and Asteroids
Summary: A new study suggests that meteorites and their parent asteroids are the most-likely sources of water on Earth. Understanding if and how volatile elements were delivered to the early Earth is important in determining the origins of water and life on our planet.

Asteroid Fire Drill
Topic: Meteorites, Comets and Asteroids
Summary: On May 29, a bus-sized asteroid sped past the Earth in the sixth-closest approach on record. Dubbed 2012 KT42, the asteroid crossed the orbits of weather and television satellites only 22,000 miles above our planet's surface.

Earth's Oldest Impact Crater
Topic: Meteorites, Comets and Asteroids
Summary: Geologists have discovered evidence of a 100-kilometer-wide crater in Greenland. The impact structure is the result of a massive asteroid or comet impact a billion years before any other known collision on Earth.

Meteorite Metal among the Solar System's Oldest
Topic: Meteorites, Comets and Asteroids
Summary: Scientists have discovered a new mineral embedded in a meteorite that exploded over Mexico in 1969. The mineral is believed to be among the oldest formed in the Solar System.

Earth-Passing Asteroid Bigger than Estimated
Topic: Meteorites, Comets and Asteroids
Summary: An asteroid that recently passed by Earth is about twice as large as originally estimated, and it would have had serious global consequences if it had impacted Earth.

Workshop Findings on Asteroid 2011 AG5
Topic: Meteorites, Comets and Asteroids
Summary: Scientists anticipate that the asteroid 2011 AG5 will fly safely past and not impact the Earth in 2040.

New Evidence Links Cosmic Impact to Mass Extinction
Topic: Meteorites, Comets and Asteroids
Summary: Melt-glass material in a thin layer of sedimentary rock, which dates back nearly 13,000 years, may suggest that an impact was linked to the extinction of North America's megafauna.

Rosetta Flyby Uncovers the Complex History of Asteroid Lutetia
Topic: Meteorites, Comets and Asteroids
Summary: Data from the Rosetta spacecraft provides a unique window into the complex history of asteroid (21) Lutetia. Studies suggest that Lutetia is a primordial planetesimal from the early Solar System.

Sunlight Has Changed the Path of Asteroid 1999 RQ36
Topic: Meteorites, Comets and Asteroids
Summary: Scientists with the OSIRIS-REx mission have measure the orbit of the asteroid 1999 RQ36 with such accuracy that they were able to determine the drift it experiences after absorbing sunlight and re-emitting the energy as heat.

Pinpointing Potentially Hazardous Asteroids
Topic: Meteorites, Comets and Asteroids
Summary: New observations are helping scientists assess the number of potentially hazardous asteroids in our solar system. These asteroids include those big enough to make it through the Earth's atmosphere and cause damage on regional or greater scales.

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