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The tiny world of Ultima Thule, which lies at the outer edges of the solar system, is flattened like a pancake, with few craters.

Catherine Meyers, Editor

Blazing meteor streaks through the Earth's atmosphere

Astronomers are trying to deflect a near-Earth asteroid for the first time, to prepare for a future object on a collision course with the planet.

Ramin Skibba, Contributor

Their observations confirm water lurks in the moon's subsoil, not just at the poles.

Ramin Skibba, Contributor

We look back in space-time this month to herald a new year.

Abigail Malate, Staff Illustrator

Radar has revealed evidence of an environmentally significant impact that probably occurred during the last 2.6 million years.

Charles Q. Choi, Contributor

Scientists are training computers to help us stop asteroids from crashing into our planet.

Yuen Yiu, Staff Writer

Explore the stars that surround us in this month's slideshow.

Abigail Malate, Staff Illustrator

The Outer Space Treaty, which turns fifty this year, laid the basic ground rules for the exploration of the final frontier.

Catherine Meyers, Staff Writer

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