query: What's the possesive case of "Mars"?
positive_passages.docid: 6363
positive_passages.text: Which singular names ending in “s” form possessives with only a bare apostrophe?
negative_passages.docid: 60732
negative_passages.text: Is there any information about Data after Nemesis?
negative_passages.docid: 752
negative_passages.text: Can you help me identify this "thing"?
negative_passages.docid: 80094
negative_passages.text: Is the planet called "Earth That Was" totally uninhabited?
negative_passages.docid: 100441
negative_passages.text: What real-world substance most closely corresponds to mithril?
negative_passages.docid: 122993
negative_passages.text: Short story, possibly a Bradbury one: adventurers find a weapon cache of dead Martian civilization, and unleash a blob
negative_passages.docid: 112980
negative_passages.text: Planetary model of atom still valid?
negative_passages.docid: 111542
negative_passages.text: Where did Mark Watney get the escape pod in The Martian?
negative_passages.docid: 130124
negative_passages.text: Is it possible to learn about an event that occurred outside of your observable universe?
negative_passages.docid: 81915
negative_passages.text: 70s(?) science fiction novel: teenage boy builds his own spacecraft which pulls/pushes gravity, is stranded on Mars when a vacuum tube burns out
negative_passages.docid: 125099
negative_passages.text: Beads in 'perpetual motion'?
negative_passages.docid: 14915
negative_passages.text: Story about lost colonized planet sent into orbit around "free" star
negative_passages.docid: 145842
negative_passages.text: Mankind prepares for a war with aliens by warring among itself
negative_passages.docid: 158769
negative_passages.text: Zeppelins, altitude record and weird creatures
negative_passages.docid: 113393
negative_passages.text: The curious case of Dmitri Valtane
negative_passages.docid: 41450
negative_passages.text: What was this story about alien food?
negative_passages.docid: 144109
negative_passages.text: Why was the alien threat in The Next Generation episode "Conspiracy" never followed up?