A day on Earth is supposed to be exactly 86,400 seconds. But precise measurements show that Earth’s rotation speed changes ...

At half the size of Earth and one-tenth its mass, Mars is a featherweight as far as planets go. Yet new research reveals the ...

Curious Kids is a series for children of all ages. If you have a question you'd like an expert to answer, send it to ...

Which way is ‘down’ has a different answer depending on where you are on Earth, in the solar system, in our galaxy and beyond ...

The space rock, known as "2026 AJ" and 40 feet in diameter, is hurtling toward our planet at around 20,500 miles per hour.

NASA has finalized plans for the SpaceX Crew-11 mission to undock from the ISS, beginning the four-person team's return to ...

After an unidentified astronaut suffered a medical issue, NASA made the call to return Crew-11 early from the ISS. Here's ...

Scientists have measured that Jupiter releases more internal heat than it absorbs from the Sun, based on observations of its structure, rotation, and atmospheric behavior.

A group of astronauts will return from the International Space Station more than a month ahead of schedule after an unnamed crew member experienced a medical issue.

2025 MN45 isn't the overall spin-rate record holder. Astronomers have found a number of small asteroids — those just a few ...

Scientists have discovered the fastest-spinning asteroid sized over 0.3 miles in diameter, which is rotating about once every ...

In its preliminary data release, taken from just seven nights of observations, the powerful Vera C. Rubin Observatory has ...