water and volcanic activity
NASA image highlights thumbs up-shaped dune field on Mars
It appears Mars is giving the universe the thumbs up. While investigating images of the Red Planet, astronomers spotted a dune field that resembles the shape of an approving hand gesture. The image was snapped by the Mars Odyssey orbiter, which was originally sent to search for evidence of water and volcanic activity on the Martian planet. While investigating images of the Red Planet, astronomers spotted a dune field that resembles the shape of a thumbs up. The name of the orbiter pays tribute to the science fiction author Arthur C. Clarke, who is known for his 2001 book'Space Odyssey'.