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.

On NASA's list

2,226

On ESA's list

2,048

On both

1,860

Disagree by >10×

Who lists what

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Highest-rated objects today

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.

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