A new look at ancient craters on Mars finds five that are arrayed along an arc that's part of a giant circle around the planet. The circle may have been Mars' equator long ago. The craters might all ...

WASHINGTON - Since the time billions of years ago when Mars was formed, it has never been a spherically symmetric planet, nor is it composed of similar materials throughout, say scientists who have ...

The recent storms that have battered settlements on the east coast of America may have been much more frequent in the region 450 million years ago, according to scientists. New research pinpointing ...

Floods of unimaginable magnitude once washed through Gale Crater on Mars’ equator around 4 billion years ago. This finding hints at the possibility that life may have existed there, according to data ...

Jupiter, eat your heart out. Our planet may have ripped apart an asteroid and worn its scattered debris as a ring for a while. 466 million years ago, Earth was an alien world. Trilobites swam through ...

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The Congo River is the world's only major river to cross the Equator twice, a rare feat shaped by ancient geological forces. This unique path sustains ...

A Canadian researcher has calculated the location of Mars' ancient poles, based upon the location of five giant impact basins on the planet's surface. This suggests that the projectiles that ...

Floods of unimaginable magnitude once washed through Gale Crater on Mars' equator around 4 billion years ago -- a finding that hints at the possibility that life may have existed there, according to ...

WASHINGTON – Since the time billions of years ago when Mars was formed, it has never been a spherically symmetric planet, nor is it composed of similar materials throughout, say scientists who have ...