NASA and the European Space Agency launched an astronomical revolution. When the Space Shuttle Discovery roared into the sky ...

It seems crazy,” Princeton physicist Chris Chyba remarked, reflecting on the device that now sits at the center of a debate ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

Replanting forests can help cool the planet even more than some scientists once believed, especially in the tropics. But even ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

With an atmosphere, by mass, of primarily hydrogen (76 per cent) and helium (24 per cent), and by volume of 89 per cent ...

Scientists have discovered a mysterious new object far beyond Neptune, and it could be one of the most distant dwarf planets ...

In a thrilling development that challenges long-held assumptions about the outer reaches of our solar system, astronomers ...

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.

The lone planet confirmed to be in the system is squeezed in between the two, orbiting at a distance similar to Earth's ...