Not all space rocks are created equal. Some burn up harmlessly in the atmosphere, while others could spell doom for civilization. But how do astronomers rank the danger of an incoming asteroid? Enter The Torino Scale—a color-coded system that rates impact threats from 0 (harmless) to 10 (extinction-level).
Back in 2004, an asteroid named Apophis briefly hit a Level 4, sparking fears of a 2029 collision. More recently, in December 2024, a newly discovered asteroid—2024 YR4—was assigned a Torino Scale 3 rating due to a 1.3% chance of impact in 2032. Should you be worried? Today, Gordy breaks down what each level really means, how asteroid threats are assessed, and what would happen if we ever hit a Torino 10.
Spoiler: It’s bad. Very bad.
So before you panic over the next “potentially hazardous asteroid” headline—check the Torino Scale first. If it’s not an 8 or higher, you can probably keep your weekend plans.
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Sources:
NASA Center for Near-Earth Object Studies (CNEOS), 2023. “The Torino Impact Hazard Scale Explained.”
Astronomy & Astrophysics Journal, 2002. “Evaluating Asteroid Threats: The Torino Scale.”
Jet Propulsion Laboratory, 2021. “Tracking Apophis and Other Near-Earth Objects.”