* Space is a vacuum: There's no solid surface to land on.

* Probes orbit or fly by: They are designed to either orbit planets and moons, or fly by them at high speed to collect data.

* Landing on celestial bodies: When a probe does land on a celestial body, it's specifically designed for that mission. For example:

* The Mars rovers: These probes have landed on Mars.

* The Apollo missions: These missions landed astronauts on the Moon.

* Venus probes: Some probes have landed on Venus, although it's a very harsh environment.

To answer your question more directly: Space probes don't "land" in space, but they do land on other celestial bodies, like planets and moons, depending on their mission.