NASA @NASA
At the North Pole of Mars, springtime is avalanche season! The @HiRISE camera on our Mars Reconnaissance Orbiter spacecraft captured this cloud of dust May 29, as melting ice blocks broke loose and tumbled down a cliff over 1600ft (500m) tall. Zoom in: https://t.co/TS6coe9SH7 https://t.co/OXaRfApYOE — PolitiTweet.org