AskHistorians/AskScience AMA Series: I’m Dagomar Degroot, the NASA Chair of Astrobiology at the Library of Congress and author of RIPPLES ON THE COSMIC OCEAN. Send me your burning questions about space, climate change, environmental history, existential risk, and more. Ask me anything!

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3. AskHistorians/AskScience AMA Series: I’m Dagomar Degroot, the NASA Chair of Astrobiology at the Library of Congress and author of RIPPLES ON THE COSMIC OCEAN. Send me your burning questions about space, climate change, environmental history, existential risk, and more. Ask me anything!