Ask Ethan: Is antigravity even possible?

Key Takeaways

• Here in our Universe, under general relativity, everything that has mass or energy seems to both cause and also to respond to the curvature of spacetime, rendering gravity an always attractive force.
• And yet, when we think about science fiction, from Star Trek to Battlestar to 2001, artificial gravity and even antigravity are ideas that have permeated our culture in film, literature, television, and more. […]

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