How do astronomers find asteroids that might hit Earth?
Quick Answer
They track the object’s position over time and calculate its future orbit with precision. Repeated observations let scientists estimate whether the asteroid could come close to Earth.
The Full Story
Asteroid-hazard monitoring begins with telescopes that survey the sky and spot moving objects against the background stars. Astronomers then take multiple measurements over days or weeks to determine the asteroid’s orbit and predict where it will go in the future. Programs run by NASA and other organizations calculate close-approach probabilities and continually update them as new data arrive. Famous survey and tracking systems have greatly improved planetary defense, especially since the late 20th century.
Key Facts
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