The Mars Express orbiter has kept an eye on an elongated cloud above Arsia Mons volcano for the last few years. The cloud is reoccurring, grows incredibly fast and is "made up of water ice," according to the European Space Agency (ESA). [Full Story]( br Credit: Space.com | imagery courtesy: ESAGCPUPVEHU Bilbao, [CC BY-SA 3.0 IGO]() | produced & edited by [Steve Spaleta]( br br -br Space.com is where humanity’s journey to new and exciting worlds is transmitted back down to Earth. Where we vicariously explore the cosmos with astronauts, astrophysicists and enthusiasts. Here, we converse with the top minds in space exploration. br br Our mission: to keep you informed on the latest in space exploration, tech innovations, space travel policies and interstellar breakthroughs.