The 1.5 percent chance that could devastate a city
In short: While the Chicxulub asteroid wiped out 75% of life 66 million years ago, modern planetary defense is racing to ensure a similar catastrophe never happens again. A newly discovered rock, 2024 YR4, has recently put astronomers on high alert, shifting from a record-breaking risk to a watchful wait.
Asteroid 2024 YR4 is a near-Earth object measuring between 130 and 300 feet in length. While it is significantly smaller than the 10 to 15-kilometer-wide Chicxulub asteroid that caused the mass extinction of dinosaurs, its potential impact remains serious. A direct hit from a rock of this size could be catastrophic enough to devastate an entire city.
The threat level of 2024 YR4 has been a moving target for scientists. Following its discovery by the ATLAS project in late 2024, the asteroid was briefly assigned a 3.1 percent chance of striking Earth—the highest probability ever recorded for such an object. However, as of February 2025, new data from NASA has already reduced that probability to 1.5 percent. Astronomers expect this figure to continue dropping toward zero as more orbital data is collected.
Planetary defense relies on a global network of observatories and automated software developed by NASA and the European Space Agency. The goal is to identify and track potentially hazardous objects before they reach our vicinity. When an object like 2024 YR4 is spotted, it is reported to the Minor Planet Center in Cambridge, Massachusetts, allowing the international community to monitor its path. While the odds are currently slim, the object remains a priority for tracking as long as its impact probability stays above 1 percent.
The discovery of 2024 YR4 highlights the success of these 'scout' systems. By using telescopes like the Very Large Telescope in Chile to capture precise images, scientists can calculate orbits with extreme precision. This proactive monitoring ensures that even 'city-killer' sized rocks are identified early enough to allow for potential intervention, moving humanity from a state of vulnerability to one of active defense.
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Sources
- Summary by Intellect · source: Asteroid Alert 2024: Is Something Like Chixculub On Its Way?
- Also: ‘City Killer’ Asteroid’s Earth Impact Risk Rises and Falls Again
- Also: Asteroid 2024 YR4 could hit Earth in 7 years – so what’s being done about it?
- Also: This asteroid might not hit Earth in 2032 after all—here’s how we know
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