A new report from the National Research Council lays out options NASA could follow to detect more near-Earth objects (NEOs) – asteroids and comets that could pose a hazard if they cross Earth’s orbit. The report says the $4 million the U.S. spends annually to search for NEOs is insufficient to meet a congressionally mandated requirement to detect NEOs that could threaten Earth.

An asteroid about the size of the one that levelled the forest in Tunguska, Siberia, a century ago flew past Earth on Monday - well within the Moon's orbit. The risk of a future impact with the object is not yet known.

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.

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.

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

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.