About 100 million years ago, a gigantic meteorite collided with Australia, creating a 3-mile-wide impact crater.
Excluding Mercury, this newly discovered asteroid has the smallest known aphelion distance in our entire solar system.
Earth's scorching core is not a loner — it has been caught mingling with other, underworldly layers.
Wildfires burning large swaths of Russia are generating so much smoke, they're visible from space, new images from NASA's Earth Observatory reveal.
The Apollo 11 mission to the moon was one of humanity's most incredible feats, but it almost didn't happen.
Astronomers discovered a car-size asteroid hours before it slammed into Earth and burned up in the atmosphere this past weekend, news sources report.
Summer is the season for tourists, and that includes a cosmic traveler — one that's three times the length of a football field — that's expected to visit Earth's neighborhood later this week.
This fall, Earth has about a 1-in-7,000 chance of getting an uninvited extraterrestrial visitor: asteroid 2006 QV89.
If Godzilla were a real creature, his incredibly rapid growth spurt on the big screen would be off the charts, even setting evolutionary records, a new report finds.
The U.S. Navy plans to set up an official reporting and investigative system that will monitor reports from its pilots about UFOs.
Earth just got another dazzling glamour shot, thanks to a satellite that snapped its photo on the March 20 spring equinox.
And for the first time, physicists have recorded the wild drum beats rippling from the magnetic poles.
Now that the government shutdown is over, federal agencies have finally released an early edition of the World Magnetic Model, almost a full year before the next one was scheduled to be released.
There's a giant void hiding under the Antarctic ice, and it's growing larger and more menacing by the day, a new study using satellite data finds.
Earth's north magnetic pole is on the move, unpredictably lurching away from the Canadian Arctic and toward Siberia.