Two Skies
NASA (JPL Sentry) and ESA (NEOCC Risk List) independently compute which near-Earth asteroids have a non-zero chance of hitting Earth in the next century. They publish only today's list. Two Skies snapshots both every day, keeps the full history, and compares them.
Almost every listed object poses essentially no threat: they are small, and their
impact probabilities are tiny and usually fall to zero as more observations arrive.
The interesting part is how the two agencies' answers differ and evolve.
Who lists what
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Highest-rated objects today
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List sizes over time
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Only complete snapshots are plotted. NASA history before Two Skies started comes from Internet Archive captures of the Sentry API; ESA's archived pages show only the top rows, so its full-list history starts with the live archive.
Latest changes
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