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How do we spot
near-Earth asteroids?

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To start, survey telescopes
scan the sky.

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When multiple pictures
of the same spot

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show a speck that's moving

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computers automatically
check it

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against a database
of known objects.

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[ ♪ ]

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If there's no match,

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it gets added to a list of
objects to confirm.

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[ ♪ ]

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And if it looks like it'll
pass very close to us,

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we give it top priority.

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[ ♪ ]

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Then it's time to call in
reinforcements!

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[ sound effect ]

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More astronomers--from NASA,
other institutions,

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and even the amateur community--

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submit additional observations.

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[ beeps ]

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Each new data point helps
refine the projected path.

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And this asteroid is
going to fly right on by.

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Earth is safe!

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All the info will be
posted online

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so it can continue to be
tracked and monitored.

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Nice work, Planetary
Defense team!

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Keep watching the skies!

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[ ♪ ]

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NASA Jet Propulsion Laboratory

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California Institute
of Technology

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For more information on
asteroids: