Plank’s data also shows that ordinary matter - the stuff that makes up stars, galaxies, planets and everything visible - accounts for a relatively tiny 4.9 percent of the universe.
Dark matter, which does not interact with light but can be detected by its gravitational pull, comprises 26.8 percent of the universe, nearly one-fifth more than previous estimates.
The rest of the universe is dark energy, a mysterious and recently discovered force that defies gravity and is responsible for speeding up the universe’s rate of expansion. New results from Planck show dark energy accounting for 69 percent of the universe, slightly less than previously estimated.
The research is the fruit of Planck’s first 15 months on orbit. Additional information, including details of how the universe’s early light was polarized, are expected next year.