ALMA image of Arp 220 cores over HST image of Arp 220. The two cores (yellow), obscured by dust on visible wavelengths, are observed by ALMA. The research team detected a bipolar outflow from the western nucleus and measured its velocity. In red, the North section of the outflow, particles are moving away from Earth. In blue, the South section of the outflow, particles are moving towards Earth. Credit: L. Barcos-Muñoz, N. Lira, J. Pinto - ALMA (NRAO/NAOJ/ESO) / Hubble Space Telescope - (NASA/ESA)
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