The idea that other universes - as well as our own - lie within "bubbles" of space and time has received a boost.
Studies of the low-temperature glow left from the Big Bang suggest that several of these "bubble universes" may have left marks on our own.
This "multiverse" idea is popular in modern physics, but experimental tests have been hard to come by.
The preliminary work, to be published in Physical Review D, will be firmed up using data from the Planck telescope.
For now, the team has worked with seven years' worth of data from the Wilkinson Microwave Anisotropy Probe, which measures in minute detail the cosmic microwave background (CMB) - the faint glow left from our Universe's formation.
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