The city-killer asteroid Apophis has an extremely small chance of being pushed on a collision course with Earth by another asteroid before it flies past our planet in 2029, new simulations suggest.

There is a small but underestimated risk that the ‘Chaos God’ asteroid Apophis could hit Earth during its super-close approach in 2029, according to a new study. The odds of such a catastrophic collision are more than one in a billion, but we can’t rule it out for at least another three years.

Apophis is a peanut-shaped space rock measuring about 1,100 feet (340 meters) in diameter, or about the same size as the Eiffel Tower. At that size, it’s not massive enough to be considered a planet-destroying asteroid, but it’s large enough to wipe out a major city and have climatic consequences for the entire planet. Discovered in 2004, the “potentially hazardous” object was named after Apep, the serpent-like Egyptian god of darkness and disorder, and was given the nickname “God of Chaos.”

Shortly after the space rock’s discovery, astronomers discovered that Apophis would fly very close to Earth on April 13, 2029, sparking fears that it could hit our planet. But further observations showed that the asteroid would safely pass Earth at a distance of less than 20,000 miles (32,000 kilometers) — less than a tenth of the distance between Earth and the Moon, according to NASA. It could still be close enough to hit some of our most distant satellites in Earth orbit.

But large asteroids like Apophis can be knocked off course by collisions with smaller asteroids, as NASA’s DART mission successfully redirected the asteroid Dimorphos by colliding with a spacecraft in 2022. Researchers have previously warned that this could happen to Apophis within the next five years, potentially putting the city-killer on a collision course with Earth.

In a new study published Aug. 26 in the Planetary Science Journal, astronomer Paul Wiegert, an expert in solar system dynamics at Western University in Canada, calculated the probability of such a scenario and found that while extremely unlikely, it is still possible.