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Artist's depiction of a collision between two planetary bodies. Such an impact between Earth and a Mars-sized object likely formed the Moon.. The giant-impact hypothesis, sometimes called the Theia Impact, is an astrogeology hypothesis for the formation of the Moon first proposed in 1946 by Canadian geologist Reginald Daly.
Animation of collision between Earth (blue) and Theia (black), forming the Moon (red and gray). Bodies are not to scale. According to the giant impact hypothesis, Theia orbited the Sun, nearly along the orbit of the proto-Earth, by staying close to one or the other of the Sun-Earth system's two more stable Lagrangian points (i.e., either L 4 or ...
99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object, 450 metres (1,480 ft) by 170 metres (560 ft) in size, [3] that caused a brief period of concern in December 2004 when initial observations indicated a probability of 2.7% that it would hit Earth on Friday, April 13, 2029.
In 1998, NASA formally embraced the goal of finding and cataloging, by 2008, 90% of all near-Earth objects (NEOs) with diameters of 1 km or larger that could represent a collision risk to Earth. The 1 km diameter metric was chosen after considerable study indicated that an impact of an object smaller than 1 km could cause significant local or ...
Recent images released from NASA have revealed new information on the origins of the asteroid system. Nearly two years ago, the Double Asteroid Redirection Test spacecraft, or DART, collided with ...
On 1 January 2014, a 3-meter (10 foot) asteroid, 2014 AA was discovered by the Mount Lemmon Survey and observed over the next hour, and was soon found to be on a collision course with Earth. The exact location was uncertain, constrained to a line between Panama , the central Atlantic Ocean, The Gambia , and Ethiopia.
ASTEROID MISSIONS GALORE. Planet Earth is on an asteroid-chasing roll. NASA has close to a pound (450 grams) of rubble collected from asteroid Bennu headed to Earth. The stash should arrive next ...
The would-be asteroid was first spotted by an amateur astronomer parsing the Minor Planet Centers' archive who hoped he had discovered a near-Earth object, Astronomy reported.