Headlines about asteroids hurtling toward Earth are a regular occurrence — and they're almost always more dramatic than the actual risk. But the science behind tracking near-Earth objects (NEOs) is real, important, and more advanced than ever.

Key Takeaways

  • Thousands of asteroids pass near Earth every year — most pose zero threat
  • NASA's Planetary Defense Coordination Office tracks all known NEOs
  • The DART mission in 2022 successfully demonstrated asteroid deflection technology
  • No known asteroid poses a significant impact threat for the next 100+ years

Why Asteroid Headlines Are Misleading

When media report an asteroid "hurtling toward Earth," the object is typically passing at millions of kilometers — well beyond the Moon's orbit. NASA classifies an asteroid as "potentially hazardous" if it's larger than 140 meters and passes within 7.5 million km of Earth's orbit. That sounds close in cosmic terms but is roughly 20 times the Earth-Moon distance.

How Asteroid Tracking Works

NASA's Center for Near-Earth Object Studies (CNEOS) maintains a constantly updated catalog of all known NEOs. Ground-based telescopes and the NEOWISE space telescope scan the sky, and sophisticated orbit calculations project each object's path decades into the future. The Torino Scale rates impact risk from 0 (no hazard) to 10 (certain global catastrophe).

The DART Mission: Proof We Can Defend Earth

In September 2022, NASA's DART (Double Asteroid Redirection Test) spacecraft deliberately crashed into the asteroid moonlet Dimorphos. The impact successfully changed its orbit — the first time humanity demonstrated the ability to alter an asteroid's trajectory. ESA's follow-up Hera mission, launched in 2024, is studying the impact crater in detail.

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Frequently Asked Questions

Is there currently any asteroid on a collision course with Earth?

No. As of 2026, no known asteroid poses a significant impact threat to Earth for the next century or more. NASA continuously monitors the sky and updates risk assessments as new observations come in.

How big does an asteroid need to be to cause serious damage?

An asteroid roughly 140 meters (460 feet) or larger could cause regional devastation. An object 1 km or larger could have global consequences. The Chicxulub impactor that contributed to dinosaur extinction was approximately 10 km across.