Mountain-sized asteroid 164400 will safely pass Earth on December 27, 2025

Article created on April 01, 2026. Last updated on April 01, 2026.

Quick Summary

Asteroid Flyby Overview

A colossal asteroid larger than a mountain safely passed Earth on December 27, 2025, an event that is exceptionally rare.

How Big Is 164400?

This asteroid exceeds 1315.0 meters (4314.3 feet), large enough to compare with entire islands or mountain ranges.

Could It Hit Us?

Extensive tracking confirmed that this giant asteroid posed no danger to Earth during its December 27, 2025 encounter.

What Would Happen If It Hit Earth?

An impact from an object this size could cause mass extinctions, as happened 65 million years ago with the dinosaurs.

Historical Context

The Chicxulub impactor, responsible for the extinction of the dinosaurs, was about 10 kilometers wide.

Upcoming Close Approaches

Apophis will pass extremely close in 2029.

About Near-Earth Asteroids

Near-Earth asteroids are remnants from the solar system's formation, and NASA tracks over 35,000 of them.

Conclusion

Fortunately, no objects of this scale are currently on a collision course with Earth.