A new study concludes that a large, as-yet-unknown Planet Nine - an estimated 4 times the size of Earth and 10 times its mass - is influencing the behavior of an oddball object in the outer solar system.

A new study suggests our planet got its 1st snowfall about 2.4 billion years ago, after a lot of land rose swiftly from the sea and set off dramatic changes on Earth.

Tommy Richardsen captured this image near Skjervøy in northern Norway.

By comparing data from the 1st-ever Pluto flyby and a 1st-ever comet rendezvous mission, scientists developed what they call the 'giant comet’ model of Pluto formation.

Astronauts aboard the International Space Station captured these images of Mount Shasta while orbiting over northern California at different times of the year.

Jupiter is the brightest object near the moon on all of these nights. You'll also notice a bright star, Spica in the constellation Virgo, nearby.

'What we are witnessing is major hydrologic change,' they said. Over 14 years, Earth's wet land areas got wetter. Dry areas got drier. They also reported multiple hot spots resulting from groundwater depletion.

Take 3 minutes to fly through the spectacular Orion Nebula, in this new 3D visualization from NASA.

"Eerie!" thought Michael Scully in North Carolina on Monday morning, when he caught this image with his iPhone. Turns out it was a rocket launch from Wallops Island of an uncrewed Cygnus cargo ship, due to reach the International Space Station today.

They observed 2 intense regions of radiation on this rapidly spinning pulsar some 6,500 light-years away. "Like seeing a flea on the surface of Pluto," they said.