Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) have mapped the intense tail of a barred spiral galaxy called ESO 137-001, also known as the ‘Norma jellyfish galaxy.’ ESO 137-001 is a textbook example of a galaxy that is undergoing stripping by ram pressure: the galaxy and its surroundings were imaged by Hubble; its tail, which traces streams of hydrogen and show up in hues of bright purple, by the MUSE instrument mounted...
