Back in 2014, the Atacama Large Millimeter/submillimeter Array (ALMA) captured an image of a young protoplanetary disk around a young star named HL Tauri. The image showed gaps and rings in the disk, substructures indicating that young planets forming there. This meant that planet formation began around young stars a lot sooner than thought. ALMA is continuing its investigation of protoplanetary disks in its ARKS survey (ALMA survey to Resolve exoKuiper belt Substructures).
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