Humanity has long looked to the heavens as a place of escape and possibility, but SpaceX's proposal to place one million AI-equipped satellites into orbit asks a question the sky itself may not yet be ready to answer: how much can the atmosphere absorb before it changes in ways we cannot undo? Atmospheric scientists are raising measured but urgent concern about the cumulative effects of continuous rocket launches and satellite reentries, particularly the aluminum oxide particles that linger in the upper atmosphere far longer than any ground-level pollutant. The ambition is genuinely novel—orbi