Hydrogen Icebergs in space? The mystery of 'Oumuamua

When a strange spinning cigar-shaped object was spotted travelling through our solar system in 2017, it ignited scientific speculation and debate. Ian Sample speaks to Darryl Seligman, lead researcher on a recent study seeking to unravel the mystery of ‘Oumuamua. Help support our independent journalism at theguardian.com/sciencepod