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This artist rendering shows what the sub-Neptunian exoplanet TOI-421 b might look like. In a new study, scientists have found new evidence of how planets of this type can lose their atmosphere. Credit: NASA, ESA, CSA, and D. Player (STScI)

This artist rendering shows what the sub-Neptunian exoplanet TOI-421 b might look like. In a new study, scientists have found new evidence of how planets of this type can lose their atmosphere. Credit: NASA, ESA, CSA, and D. Player (STScI)

This artist rendering shows what the sub-Neptunian exoplanet TOI-421 b might look like. In a new study, scientists have found new evidence of how planets of this type can lose their atmosphere. Credit: NASA, ESA, CSA, and D. Player (STScI)

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