Self-portrait of Curiosity rover on Mars

Self-portrait of the Mars Curiosity rover on a flat, rocky perch in the Yellowknife Bay region of Mars' Gale Crater.

The island of Tristan da Cunha

This photo, taken by an astronaut aboard the International Space Station, shows the volcanic island Tirstan da Cunha in the southern Atlantic Ocean.

Arctic sea ice near its maximum for 2013

Arctic sea ice near its maximum for this year, in Canada’s Gulf of St. Lawrence.

Slow sunrise sweeping across moon’s near side

In this sequence of images from February 17, 2013, you can notice the line of sunrise moving on the moon's face. It's subtle ...

Quaoar, a rocky world orbiting beyond Neptune

Artist's impression of 50,000 Quaoar, a small rocky world with its own moon, a billion kilometers beyond Pluto.

Moon and Jupiter in skies throughout world last night

The star Aldebaran, Jupiter, and the first-quarter moon formed a triangle in Sunday night's sky, as captured by Duke Marsh in Albany, Indiana.

Asteroid 2012 DA14 as it passed over Europe

Mohamed Laaifat Photographies in Normandy, France captured this image of asteroid 2012 DA14 as it swept over Europe on February 15, 2013.

Happy Valentines Day

Love is everywhere. You just need to look for it.

Mosaic of the moon’s north pole

A mosaic of the moon's north pole composed of nearly 1,000 images taken over a one-month period during the moon's northern summer.

February sunset over the Po

Today's image, sunset over Italy's Po River near Turin, comes from EarthSky Facebook friend Marco Mereu.