In the search for the hypothetical Planet Nine, scientists may have uncovered another explanation for the patterns in the orbits of Kuiper Belt objects.
The Earth and the Moon were long thought to be virtually identical in composition. Now we know they are not.
Earth currently has a second moon - but it won't stay long.
Why isn't there an endless variety of planets in the universe? An astrophysicist explains why planets only come in two flavors.
Saturn's largest moon has been fully mapped for the first time.
Astronomers have found 20 new moons around Saturn, and will keep finding more as technology improves.
A giant exomoon hundreds of times the size of Earth is revealing secrets about how giant planets like Jupiter and Saturn formed. They might also help astronomers find planets where life may thrive.
Kepler-452b is sometimes called 'Earth 2.0', but there's a lot we still don't know about it.
Most people think that many millions of years ago, Saturn didn't have rings at all. Instead, it had a big moon moving around it. Eventually, the moon burst and broke into pieces.
This hot, acidic neighbor with its surface veiled in thick clouds hasn't benefited from the attention showered on Mars and the Moon. But Venus may offer insights into the fate of the Earth.
A 100-metre-wide asteroid passed just 70,000km from Earth on Thursday, and we had little warning it was about to happen. What threat is posed by asteroids and how do we find them?
Yes, the Sun absolutely spins. In fact, everything in the universe spins. Some things spin faster than the Sun, some are slower and some things spin 'backwards'.
The new era of space exploration is characterized by an emphasis on diversity and international cooperation. But there's a lot of work to do before there's gender equality in STEM fields and at NASA.
When you look at the squiggly lines on Joy Division's famous album cover, you're seeing a record of lightning in outer space.
Whether anything could live in Europa's subsurface ocean depends on what kind of salt it contains. Now scientists have found out.
The dwarf planet Pluto is heading away from the Sun and that's having a devastating impact on its atmosphere.
Exoplanet discovery can help us work out how the Earth will end its days.
There's a mysterious lack of small bodies beyond Neptune, but a 'snowman-shaped' object may help explain why.
A body at least twice as massive as the Earth smashing into Uranus could have made it lopsided, shows research.
Naming features on other worlds is a trickier issue than you might think.