Some asteroids are quietly speeding up or veering off their predicted paths, yet telescopes see no glowing tails or hazy comas that would mark them as comets. That mystery has turned a once obscure ...

Smaller bodies of rock, metal, ice, and dust can be found scattered throughout space. These objects travel on their own courses, sometimes silently beyond Jupiter and occasionally quite close to Earth ...

Choose your fighter for the origin of water on Earth! Was it always here or did it come to this planet from somewhere else in space? And, either... Comets, asteroids, and planets: The likely origins ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. More than 80 observers have ...

Dear EarthTalk: It seems to me the single biggest potential “environmental” problem we could face—even bigger than global warming or a nuclear war—is a comet or asteroid striking the Earth. Do we ...

NASA's head of planetary defence, Dr Kelly Fast, has issued an unsettling update on thousands of ‘city-killer’ asteroids that could hit Earth.

"For asteroids of the size scale relevant to planetary defense (i.e., ∼50-500 m), the mass can only be directly measured ...

The dinosaurs were wiped out by an asteroid, but does that mean we risk suffering the same fate - and should you be worried about the possibility? Leah Crane sets the matter straight ...

Estimating a mass for a potentially hazardous asteroid (PHA) is perhaps the single most important thing to understand about ...

Asteroids, like comets, are the remnant population of planetesimals—those small primordial bodies from which the planets accumulated. Common asteroid types are described in Table 4.1. Generally, the ...

An asteroid estimated to be a kilometer (3,451 feet) wide will fly by Earth on January 18. The video in the media player above is from a related report. It will pass within 1.2 million miles of our ...