Context: There are four categories of terra nullius, land that is unclaimed by any state: the small unclaimed territory of Bir Tawil between Egypt and Sudan, Antarctica, the oceans, and celestial bodies such as the Moon or Mars. In the last three of these, international treaties (the Antarctic Treaty, the United Nations Convention on the Law of the Sea, and the Outer Space Treaty respectively) prevent colonization and potential statehood of any of these uninhabited (and, given current technology, not permanently inhabitable) territories.

Question: What are the four categories of terra nullius?
Answer: the small unclaimed territory of Bir Tawil between Egypt and Sudan, Antarctica, the oceans, and celestial bodies

Question: What three treaties exist for unclaimed lands?
Answer: the Antarctic Treaty, the United Nations Convention on the Law of the Sea, and the Outer Space Treaty

Question: What do the treaties defend against?
Answer: prevent colonization and potential statehood of any of these uninhabited (and, given current technology, not permanently inhabitable) territories.

Question: Where is Bir Tawil located?
Answer: between Egypt and Sudan

Question: What are the four categories of the Outer Space Treaty?
Answer: Unanswerable

Question: What three treaties exist for claimed lands?
Answer: Unanswerable

Question: What does terra nullius defend against?
Answer: Unanswerable

Question: Where was the United Nations Convention located?
Answer: Unanswerable

Question: How many categories of outer space are there?
Answer: Unanswerable