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Fallout: New Vegas Hints
How can I unlock that door?
1 of 5: You could pick it if your Lockpick skill is 50+.
2 of 5: You could hack the terminal to the right of it and use it to unlock the door if your Science skill is 50+.
3 of 5: If neither is the case, your only option is to talk to the nearby Tour Guide robot and follow it along as it slowly takes you from room to room. (You could kill it and loot it for the planetarium key, but that would turn all the other robots hostile.)
4 of 5: After it unlocks the planetarium doors, leave it behind and go up the stairs in the planetarium that lead to a control area.
5 of 5: Grab Jenny Millet's security keycard from the console, then go back to the entry room and open the door.