A new study shows that Earth's moon should, theoretically, be able to have its own moon. Why doesn't it?

For the first time, researchers have found evidence in data sent back by Cassini for methane/ethane rainfall near Titan's north pole, signaling the start of the summer season on Saturn's largest moon.

An international consortium has been striving to obtain an image of the “shadow” of the event horizon of our Milky Way's central supermassive black hole. Here's an update.

The major planets in our solar system orbit, more or less, in a single plane. That's why you can look for them along the same sky path traveled by the sun and moon. Is the same true for exoplanets in distant solar systems?

Check it out. You can see the flash of a meteorite that struck the moon during Sunday night's total eclipse. Photos and video here.

Most scientists believe the moon and Earth have been bombarded by meteorites at a constant rate for the past few billion years. New research suggests that - in the past 300 million years - it's been happening 2 to 3 times more frequently.

New findings suggest that Saturn's rings formed only 10 to 100 million years ago, during the earthly age of the dinosaurs.

Here's an alternative explanation to the Planet 9 hypothesis, the idea that a large undiscovered planet in the outer solar system is pulling on some small outer worlds, distorting their orbits.

For the 1st time ever, plants were sprouted on the moon - but didn't survive long - as part of a biosphere experiment on China's Chang'e-4 lander.

Our sun's planets orbit in a plane extending from the sun's equator. Astronomers have found a double-star system whose planet-forming disk has flipped up - perpendicular to what we'd expect - over the poles. What would nature be like on one of these worlds?