The best replacement for dark energy is dark matter.

The best alternatives to dark energy are rated as following:
★★★★★  dark matter
★★  neat video
★★  minitaur
★★  light energy
★★  antimatter
★★  cosmological constant
★  mopho
★  vacuum energy
★  liquid karma
★  slim phatty
★  mono lancet
  modified gravity
  microzwerg
  negative energy
  kraftzwerg
  matter

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Speaking about dark energy, one probably shouldn't forget about dark energy.

Other search terms related to dark energy and their ratings are:
★★★★★ dark energy
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dark energy
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