noun
lander; landing module
Refers to a spacecraft designed to land on the surface of a moon, planet, or other celestial body. Common in space exploration contexts.
月面に着陸船が無事に降り立った。
The lander safely touched down on the lunar surface.
探査機 is a broader term for any probe or explorer, not necessarily one that lands.
Compound of 着陸 (ちゃくりく, 'landing') and 船 (せん, 'ship'). The term is a straightforward modern coinage for space landers.