Gas distribution around the triple protostars IRAS 04239+2436, (left) as observed in SO molecule emissions with ALMA, and (right) as reproduced by the numerical simulation on the supercomputer ATERUI. In the left panel, protostars A and B, shown in blue, indicate the radio waves from the dust around the protostars. Within protostar A, two unresolved protostars are thought to exist. In the right panel, the locations of the three protostars are shown by the blue crosses. Credit: ALMA (ESO/NAOJ/NRAO), J.-E. Lee et al.

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