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New Wrinkle? Ancient Earth Got a 'Face-Lift,' Study Suggests

One reason older rocks may be missing is that they were destroyed when asteroids and comets pummeled the Earth, moon and inner planets of the solar system, scientists report today (July 30) in the journal Nature. "The surface of the Earth was heavily ...

Three Moon Nights: Will the Real Supermoon Please Stand Up?

But love 'em or hate 'em, tales of the "Supermoon" are gracing ye olde Internet again, with hyperbole that's usually reserved for comets, meteor showers and celeb debauchery. Such tales promise the "biggest full moon ever!" ... just like last year ...

ISEE-3 Team Fires Up Engines on 36-Year-Old NASA Probe

ISEE-3 ceased operations in 1997 following a 19-year career that saw it perform a variety of missions, such as observing the sun and chasing comets. ISEE-3 needs to be moved to put it in an advantageous position to communicate with Earth. Then the tem will ...

Confirmed: Voyager 1 in Interstellar Space

Interstellar space begins where the heliosphere ends. But by some measures, Voyager 1 remains inside the solar system, which is surrounded by a shell of comets known as the Oort Cloud. While it's unclear exactly how far away from Earth the Oort Cloud lies ...

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Comet - Wikipedia, the free encyclopedia

Updated 23 hours ago

A comet is an icy small Solar System body that, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes ...

Comets – Facts and Information about Comets

Updated July. 26, 2014

Comets are icy bodies that release gas or dust. offers an overview of comets including physical characteristics, comet formation, collisions and more.

Solar System Exploration: Planets: Comets: Overview

Updated July. 30, 2014

Comets are cosmic snowballs of frozen gases, rock and dust roughly the size of a small town. When a comet's orbit brings it close to the sun, it heats up ...

Comets - Astronomy For Kids -

Updated July. 26, 2014

What are comets? A comet is a small world which scientists sometimes call a planetesimal. They are made out of dust and ice, kind of like a dirty snow ball.