An asteroid hurtling towards Mars has a 1 in 28 chance of walloping the Red Planet on 30 January, according to the latest calculations. The rock's discovery just a couple of months before a possible impact begs the question of what would happen if it were instead headed for Earth.

Observations by astronomers tracking near-Earth asteroids have raised a new object to the top of the Earth-threat list.

A new survey revises down the likelihood of a massive asteroid hitting the Earth by 20-30%. We're only due to collide with rocks larger than one kilometre across roughly once every 600,000 years, it concludes.

Fraser Cain wonders if the uncertainty surrounding impact predictions will prevent governments from taking the needed action to stop a real impact threat.

Astronomers debate the risks of a "doomsday" asteroid colliding with the earth.

An excellent discussion of the national security dimensions of the asteroid threat from a roundtable at the Marshall Institute. Transcript of discussion includes question and answer session.

Researchers have determined, with the assistance of US military satellites, that the risk of Earth being struck by a killer asteroid is less likely than previously believed.

Data from U.S. early warning satellites helps lower forecast for asteroids exploding in Earth's atmosphere.

Two new studies on the threat of asteroid impact hint that our planet may not be in quite as much danger as previously thought.

In recent years, the Department of Defense has been working to provide data about asteroid strikes to nations potentially under missile attack and to the scientific community; however, it takes several weeks for the data to be released since much of it is gathered from classified systems. Brigadier General Simon P. Worden has recently suggested that a NEO warning center be established that can assess and release this data as soon as possible to all interested parties while ensuring sensitive data is safeguarded.