91±¬ÁÏ

Mars October 20, 2015

'Comet of the century' to buzz Mars

Earthlings may be treated to a dazzling celestial display this fall as Comet ISON makes a suicidal plunge toward the sun.

SCIENCE October 20, 2015

QE2 asteroid will fly by Earth, stay safe 3.6 million miles away at closest approach on Friday

An asteroid more than 1½ miles long will zoom past Earth this week from a far-off distance.

Asteroids October 20, 2015

Green meteorite may be from Mercury, a first

Scientists may have discovered the first meteorite from Mercury.

Asteroids October 20, 2015

Scientists plan mission to smash into an asteroid

A mission that a.m. to slam a spacecraft into a near-Earth asteroid now officially has a target — a space rock called Didymos.

Asteroids October 20, 2015

Fright night flyby: Skyscraper-sized asteroid will pass Earth on Halloween

A skyscraper-sized asteroid will fly by Earth on Halloween, according to scientists, who say that the object was only discovered 10 days ago.

Mars October 20, 2015

8 most important spaceflight stories of 2014

From accidents to soaring daredevils to space capsules, 2014 was a big year in spaceflight.

Astronomy October 20, 2015

Most of Earth's water came from asteroids, not comets

Asteroids, not comets, may have delivered most of Earth's water to the planet when the solar system was young, new data from a probe orbiting a comet suggests.

Astronomy October 20, 2015

Dark matter 'slingshot' could send lethal asteroids crashing into Earth

Dark matter could sling lethal meteors at Earth, potentially causing mass extinctions like the cataclysm that ended the Age of Dinosaurs, Harvard scientists say.

Asteroids October 20, 2015

100-foot asteroid buzzes past Earth: Watch the replay here

A newfound asteroid buzzed close by Earth Wednesday, flying safely between our planet and the orbit of the moon. Watch a recap of the close encounter here.

Asteroids October 20, 2015

Phone home! European Space Agency hears sign of life from comet-chasing spacecraft

Europe's Rosetta probe woke up from years of hibernation Monday and phoned home, a signal that traveled half a billion miles back to scientists waiting on pins and needles after hours of agonizing wait.

Astronomy October 20, 2015

Ask a science teacher: What is a black hole?

A black hole is a place in Washington, DC, where all our tax dollars go. Just kidding! A black hole is perhaps the strangest object in the universe. It is the remains of a massive dead star that has run out of fuel and collapsed.