Tunguska and similar events Spacewatch and other near-Earth object search programs demonstrate that the Earth is surrounded by a swarm of asteroids and comets that threaten us with collision and world-wide destruction. The danger from near-Earth objects has sparked research into the probability of occurrence of damaging impacts as well as the possibility of deflecting potential impactors before they strike the Earth. The extent of the damage even a small impactor can cause is exemplified by the asteroid or comet fragment which exploded in the air over Tunguska in Siberia in June of with a force equivalent to between ten and twenty megatons of TNT.
October 24, A new study could provide insights about the abundance of water in fragments from a famous asteroid.
While water is essential for life on the planet, the New clues from the dawn of the solar system March 16, A research group in the UA Lunar and Planetary Laboratory has found evidence in meteorites that hint at the discovery of a previously unknown region within the swirling disk of dust and gas known as the protoplanetary disk Violent solar system history uncovered by WA meteorite August 8, Curtin University planetary scientists have shed some light on the bombardment history of our solar system by studying a unique volcanic meteorite recovered in Western Australia.
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The research, presented in a paper published September A new classification scheme for exoplanet sizes September 24, There are about exoplanets in the latest catalogs. Their radii have generally been measured by knowing the radius of their host star and then closely fitting the lightcurves as the planet transits across the face of First to red planet will become Martians: Origami opens up smart options for architecture on the Moon and Mars September 21, Origami and high-performance textiles are transforming architecture plans for smart human habitats and research stations on the Moon and Mars.Abstract.
The asteroid impact near the Russian city of Chelyabinsk on 15 February was the largest airburst on Earth since the Tunguska event, causing a natural disaster in an area with a population exceeding one million.
Meteorites are space rocks that fall to Earth's surface. Nat Geo Sites.
Nat Geo Sites These achondrites are the results of Mars and the Moon’s own meteorite impacts. Large meteorites hit the surface of Mars and the Moon, blasting off bits of rock. they can cause great damage. The extinction of most life on Earth 65 million years ago.
damage it will cause to earth. Table 1 shows the size of meteorites, the expected weight of the meteorite (in megatons), and the range of damage that can be expected from it’s impact with.
To date, there have been nearly 1, recovered falls (meteorites seen to fall) and nearly 40, finds (found, but not seen to fall). It is estimated that probably meteorites reach the surface of the Earth each year, but less than 10 are recovered.
The reason there are now more than 30, meteorite finds in the world's collections started with the discovery by Harvey H. Nininger that meteorites are much more common on the surface of the Earth than was previously thought.
The following table summarizes by object the potential future Earth impact events that the JPL Sentry System has detected based on currently available observations.
Click on the object designation to go to a page with full details on that object.