Near-Earth Asteroids: Why We Track Them and How to Spot One
Thousands of asteroids orbit near Earth. Learn why scientists monitor them, how close they actually come, and what happens if one is headed our way.
Near-Earth Asteroids: Why We Track Them and How to Spot One
At this very moment, an asteroid is crossing Earth's orbit. Not hitting us. But we're watching.
Why? Because 66 million years ago, a 10-kilometer asteroid hit Earth and killed the dinosaurs. Since then, we've learned: knowing what's coming is half the battle.
What Are Near-Earth Asteroids?
Asteroids are rocky remnants from the solar system's birth. Most orbit between Mars and Jupiter. But thousands have orbits bringing them near Earth.
We've discovered 30,000+ near-Earth asteroids. New ones are found constantly. The reassuring part: we know where the dangerous ones are.
How Close Do They Come?
In 2013, a meteor exploded over Siberia with thermonuclear force, flattening 80 million trees. That meteor was 20 meters wide.
In 2029, Apophis will pass 31,000 kilometers above Earth—closer than some satellites. We'll see it with binoculars. No collision risk. Just spectacular.
Why Monitor Them?
Science: Asteroids are time capsules about the solar system's formation. Some contain water, metals, organics.
Survival: A 1-kilometer asteroid would cause global catastrophe. We can't prevent all impacts, but we can detect them decades in advance.
Planetary Defense
If an asteroid threatened Earth 10 years out, we'd have options. Deflection. Evacuation. NASA's DART mission in 2022 proved we could nudge an asteroid by crashing a probe into it.
The key: early detection.
SkyTracko Integration
SkyTracko tracks near-Earth asteroids in real-time. See what's passing Earth this week. Explore orbits. Understand their trajectories.
FAQ: Near-Earth Asteroids
How many near-Earth asteroids are there?
30,000+ discovered. Estimates suggest 1+ million objects larger than 100 meters.
Could an asteroid hit Earth tomorrow?
Unlikely. Large asteroids are well-cataloged. Risk from unexpected impact is low for centuries.
Could we deflect an asteroid?
Yes. NASA's DART proved it in 2022.
What's the worst case scenario?
10-kilometer impact. Extinction-level. Probability this century: less than 0.01%.