The Mars Express orbiter launched to the Red Planet. Twenty years later, ESA has delivered a high resolution color image of ...

We all know Mars is called “The Red Planet,” but have you ever stopped to wonder—why is it red? The classic joke explanation ...

Earth's oceans could one day turn purple. Nearly three fourths of Earth is covered by oceans, making the planet look like a ...

Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...

"The extent of the tail is gargantuan, stretching up to 9 million kilometers [5.6 million miles] long," said MIT astronomer Marc Hon.

The study's observations also revealed unexpected diversity in the "colors" of the HR 8799 system's inner planets. "The differences between the HR 8799 planets are quite interesting because ...

Creative liberties were taken for the colors of the planets, which are currently unknown. The exception is the top-right one, which is known to sport a blue exterior. ESA / Hubble and NASA Are we ...