The phrase "hostile planet" refers to a planet or environment that is very unfriendly or dangerous for living beings, making it difficult to survive or thrive there. Full definition
For bots like Scarab to be able to explore hostile planets completely unsupervised, researchers must write its complex behavioral software here on earth and then test it to see how it works. (discovermagazine.com)
Arrowhead Game Studios» tactical twin - stick shooter drops up to four players on to hostile planets with two goals in mind: complete objectives and survive the mission... (co-optimus.com)
Bill Nye is a typical scientist who believes that a once dead hostile planet just coincidently happened to spring forth life with all it's intricacies. (religion.blogs.cnn.com)