HomeAstronomyPlanetary defense: Protecting Earth from space-based threats

Planetary defense: Protecting Earth from space-based threats

Planetary defense is the effort to monitor and protect Earth from asteroids, comets and other objects in space. 

Earth‘s gravity attracts more than a hundred tons (more than 90 metric tons) of small objects and dust from space daily, according to NASA. Most of this material burns up in the atmosphere without any effect on the planet; larger chunks may produce a bright streak of light that’s visible in the night sky or a small meteorite for a rock hunter to find.

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