The European Space Agency's Planck orbital observatory is gathering data on the cosmic microwave background, or CMB — background radiation that still lingers from an early, hot stage of the universe's existence.
But that research also has yielded what could be evidence of a multiverse. In 2010, a team of scientists from Great Britain, Canada and the U.S. discovered four odd, seemingly unlikely circular patterns in the CMB. They hypothesized that the marks essentially were bruises that our universe got from bumping into other universes [source: Zyga].
In 2015, ESA researcher Rang-Ram Chary made a similar discovery. Chary took a model of the CMB out of the observatory's picture of the sky, and then removed everything else that we know about — stars, gas, interstellar dust, you name it. At that point, the sky should have been pretty much empty, except for some background noise.
But it wasn't. Instead, in a particular frequency range, Chary could detect scattered patches in the map of the cosmos, areas that were about 4,500 times brighter than they should have been. The researcher came up with another possible explanation: The patches are imprints from a collision between our universe and a parallel one.
As Chary told EarthSky.org, unless someone comes up with another way to explain the patches, "one has to conclude that Nature may be playing dice after all, and we are just a random universe among a multitude of others" [sources: Byrd, Sokol].