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Signs of alien worlds from long ago and far, far away

Signs of alien worlds from long ago and far, far away

作者:毋丘岩瀚  时间:2019-03-14 09:10:02  人气:

WITH the discovery of planets around distant stars in the Milky Way now almost routine, it takes evidence of planets beyond our own galaxy to turn heads – and that’s what Erin Mentuch at the University of Toronto in Canada has produced. Mentuch analysed 88 remote galaxies whose light was emitted when the universe was between a quarter and half its current age – making them far too remote for their stars to be seen individually. The galaxies’ light output peaks at two distinct wavelengths. One represents the combined light of a galaxy’s stars; the other, at longer wavelengths,