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A strange picture of odd, spherical rock formations on Mars from NASA's Opportunity rover has scientists scratching their heads over what exactly they're looking at.

from NASA

Mars Curiosity Rover Arrives at Martian Mountain

Old and new routes of NASA's Mars Curiosity rover NASA’s Mars Curiosity Rover Arrives at Martian Mountain

The new photo by Opportunity is actually a mosaic of four images taken by a microscope-like imager on its robotic arm, and then stitched together like puzzle pieces by scientists on Earth.

Once a stream flowed down the steep rim of Gale Crater and deposited rocks on the flat plain below, say JPL scientists.

NASA Chief Scientist Predicts We'll Find Signs Of Alien Life By 2025
from io9

NASA Chief Scientist Predicts We'll Find Signs Of Alien Life By 2025

Ocean Worlds: Earth isn't the only ocean world in our solar system. Oceans could exist in diverse forms on moons and dwarf planets, offering clues in the quest to discover life beyond our home planet. This illustration depicts the best-known candidates in our search for life in the solar system.

#Astronomy: NASA spacecraft New Horizons is currently en route to the #Pluto-Charon system, estimated arrival date July 14, 2015.