Earth is the only planet traveling within its nearly circular orbit around the sun. But what if Earth shared its orbit with another planet?
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Scientists think they have identified a lava world so dramatic that it might boast a thin regional atmosphere of vaporized rock where it is closest to its star.
Astronomers are vetting a technique that could aid the hunt for Planet Nine, which some researchers think lurks undiscovered in the far outer system, way beyond Pluto's orbit.
Scientists have found an alien world that orbits its host star every 3.14 Earth days, a close approximation of the famous mathematical constant pi.
Researchers are investigating an alien version of water inside the strange, icy interiors of Uranus and Neptune.
New imagery pinpoints the spot where a baby planet is forming around the young star AB Aurigae, which lies 520 light-years from Earth.
Even if you're stuck indoors during the pandemic, you can still catch May's full moon, also known as the flower moon.
The alleged exoplanet Fomalhaut b was discovered in 2004 and disappeared in 2014. Astronomers now say it was never a planet to begin with.
An exoplanet may be shaped like an American football due to the mighty gravitational forces it experiences close to its star, a new study finds.
Buried inside data Voyager 2 gathered at Uranus more than 30 years ago is the signature of a massive bubble that may have stolen a blob of the planet's gassy atmosphere.
Chemicals in ancient ocean rocks hint that 3.2 billion years ago, the surface of a baby Earth was continent-free and covered by a global ocean.
Why isn't there an endless variety of planets in the universe? An astrophysicist explains why planets only come in two flavors.
For the first time ever, astronomers have spotted evidence of a planet circling a superdense stellar corpse known as a white dwarf, a new study reports.
The tiny planet Mercury will be visible from Earth as it moves across the sun, in an event known as a transit.