Teresa Jue
October 17, 2014 AT 02:00 PM EDT

Matthew McConaughey, Anne Hathaway, and Jessica Chastain shared a few Interstellar tidbits behind the scenes of the EW cover shoot for this week’s issue—namely, how they can’t really talk about what the movie’s about.

Interstellar centers around a four-person crew who seek a new home for humankind for an environmentally ravaged Earth. The widowed Cooper (McConaughey) leaves behind two children to lead the crew and traverse through a wormhole, going beyond the limits of human discovery in space.

Watch the trio talk about keeping a tight lip on Interstellar details, how McConaughey jokes about making up “all kinds of bullsh–,” and the stars’ favorite science fiction movies growing up.

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