Skywatchers are in for a month full of cosmic activity this August. Here’s what to know about the upcoming planetary ...

It's unlikely you'll be able to walk outside and see a line of planets, but according to NASA, a seven-planet parade happening tonight could be visible in some form in parts of the U.S.

As the closest planet to the Sun, Mercury is exposed to the star's enormous gravitational field. And it's really stressful.

A team of astronomers led by Macquarie University has monitored the orbital decay of an extreme exoplanet to gain new ...

Two meteorites found in the Sahara show tantalizing similarities to the innermost planet, and while researchers say they are ...

The punishing radiation appears to be causing the planet to shed its atmosphere at a rate of at least 1 trillion grams per ...

Two meteorites found in the Sahara in 2023 might be from Mercury, a study suggests, but doubts remain due to how little is known about the planet closest to the sun.

But because Venus and Mercury orbit closer to the sun than Earth, with smaller, faster orbits, it's more rare for them to make an appearance, according to NASA.