By Rafi Letzter, Live Science Staff Writer | August 6, 2018 10:50am ET  NASA has cooled a cloud of rubidium atoms to ten-millionth of a degree above absolute zero, producing the fifth, exotic state of matter in space. The Cold Atom Lab (CAL) is a compact quantum physics machine, a device built to work in the confines of the International Space Station (ISS) that launched into space in May. CAL is about the size of a small refrigerator and can be operated remotely from Earth,” Robert Shotwell, who leads the experiment from the Jet Propulsion Laboratory, said in the statement.