What happened, and why does this milestone matter?

A milestone is an important event or achievement.

NASA says the rover used Autonomous Navigation, or AutoNav, to cover the distance to the milestone in a single drive.

Here, the milestone is the rover reaching the record distance.

On October 11, 2026, Perseverance’s odometer reached 45.22 kilometers, or 28.10 miles.

An odometer is a device that measures how far a vehicle has traveled.

NASA says that set a record for the farthest distance driven on another celestial body.

A celestial body is a natural object in space, such as a planet or moon.

NASA’s engineering update says the rover spent time making short drives near ancient rock outcrops.

Rock outcrops are places where large areas of rock are visible at the surface.

It made abrasions on rocks and carried out what the update calls proximity science: work close to the rocks.

Here, abrasions are marks made on the rocks by rubbing or scraping them.

It made abrasions on rocks and carried out what the update calls proximity science: work close to the rocks.

Proximity science means studying something from nearby.

NASA says the rover used Autonomous Navigation, or AutoNav, to cover the distance to the milestone in a single drive.

Autonomous Navigation is a system that helps the rover choose how to move without a person controlling every step.

Perseverance had been making short stops to study rocks, and it also used autonomous navigation for a longer drive.

Here, autonomous navigation is the rover’s ability to guide itself during a drive.

In simple terms, AutoNav helps the rover assess the ground and choose a route between destinations selected by mission controllers.

To assess the ground means to examine it and judge what it is like.

To me, the important point is that the distance grew alongside the science work.

Here, alongside means at the same time as.