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Researchers have resurrected the theory that other universes lie within "bubbles" of space and time, known as the "Multiverse" theory.
Studies of the low-temperature glow left from the Big Bang suggest that these "bubble universes" have left marks on our own.
The theory is popular in modern physics, but experimental tests have been hard to perform.
A team of scientists used data from the Wilkinson Microwave Anisotropy Probe (WMAP) to help reignite this theory.
This probe measures detail of the cosmic microwave background (CMB), which s the faint glow left from the formation of the Universe.
The multiverse theory said these bubble universes are popping into and out of existence and colliding all the time, with the space between them rapidly expanding.
Hiranya Peiris, a cosmologist at University College London, and her colleagues say that when these universes are created adjacent to our own, they may leave a characteristic pattern in the CMB.
"I'd heard about this 'multiverse' for years and years, and I never took it seriously because I thought it's not testable," Dr Peiris told BBC News. "I was just amazed by the idea that you can test for all these other universes out there - it's just mind-blowing."
Comment: No need for any further experiments, because the process of changes in the layers of the atmosphere due to comet dust loading has already started. The next Ice Age appears to be on our doorstep.
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