Find out what’s speeding up Earth’s rotation and why it may force timekeepers to delete a second ...

In the Northern Hemisphere, Earth’s axis of rotation, referred to as the “North Celestial Pole,” currently points to a spot on the celestial sphere near the star Polaris (the “North Star” or “pole ...

If I were on Mars, how often would I see Earth transit the Sun? Steven RiserConyers, Georgia From Mars, Earth transits the Sun four times in a 284-year cycle. The transits occur in either May or ...

A company wants to brighten the night sky by reflecting sunlight onto Earth using mirrors placed in orbit. Not a one-off stunt, but a full system desi.

The collision bears a striking resemblance to the one thought to have created the Earth and Moon about 4.5 billion years ago.

Launched in 2021 on the world’s first planetary defense exercise, the Dart spacecraft deliberately plowed into Dimorphos, which orbits a bigger asteroid, Didymos, as they circle the sun together. The ...

NASA’s DART mission changed the Dimorphos' asteroid orbit around the Sun, proving spacecraft impacts could help defend Earth.

That bright "star" in the west after sunset is Venus, often called the "Evening Star". It will shine brightly for most of the ...

Don't miss the only total lunar eclipse of 2026. Learn when and where to see the 'blood moon' and what to expect in California.

A solar eclipse recorded in ancient China more than 2,700 years ago is helping scientists refine measurements of Earth’s rotation and investigate the Sun’s past behavior.

New data about the DART spacecraft’s effects adds evidence that Earth could be defended from future deadly asteroids by diverting their orbits.

The traditional Habitable Zone (sometimes called the Goldilocks zone) is kind of like a campfire. If you sit too close, you ...