This is why we must make it our mission to find asteroids
before they find us.
Jupiter's migration may have simultaneously knocked around more close-in asteroids
, scattering them outward.
- named 2012 DA14 after it was discovered last year - is one of 500,000 known rocks circling us.
One way to distinguish an asteroid
from a star is by its motion, typically 30-arcseconds per hour relative to the background stars.
of this size pass by Earth more frequently, though the last such event happened in 1976 and the next will not happen again until 2028 when as asteroid
called 2001 WN5 will skim about halfway between the Moon and Earth.
Two chapters are concerned with photometric techniques, including lightcurve reduction and interpretation in terms of asteroid
body shape and spinaxis modelling.
On October 7, 2008, an asteroid
the size of a car blazed through the atmosphere and crashed into the Nubian Desert in the African nation of Sudan.
This is an amazing result and shows that recent events [in the asteroid
belt] can strongly influence our impact history," says planetary scientist Derek Richardson of the University of Maryland at College Park.
How could one asteroid
cause such widespread destruction?
Andrea Milani, an asteroid
expert at the University of Pisa, in Italy, said: "We want to investigate the internal structure of an asteroid
, and at the same time develop and test the technology necessary, in a worst case scenario, to deflect a sizeable asteroid
They are small rocky objects that move in elliptical orbits in the main asteroid
belt between the orbits of Mars and Jupiter.
This one will be an asteroid
"with our name on it," in the words of David Morrison, a scientist at the NASA Ames Research Center and one member of a small community of astronomers, physicists, engineers, and other scientists who think a lot about such an unthinkable event.
WASHINGTON - An asteroid
will pass close enough to the Earth to be viewed with binoculars tonight, but astronomers said there is no immediate danger that the half-mile-wide space rock will hit the planet.
Jim Benson plans to declare ownership of an asteroid
orbiting between Earth and Mars.
data highlights effect of CRESTOR[TM] on arterial remodeling