Why is the Universe accelerating?

The Universe doesn’t make sense to scientists either.

What is the “dark energy” causing the Universe to accelerate its expansion? Here are some of scientists’ best theories:

  • It’s just a new thing we discovered.
  • Perhaps general relativity is wrong.
  • Maybe gravity leaks out to a 4th spatial dimension?
  • It’s “vacuum energy”, but our prediction is wrong by 10¹²⁰, so other universes exist.
  • I dunno.