Message from planets in distant galaxies

摘要

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.rnMentuch analysed 88 remote galaxies whose light was emitted when the universe was between a quarter and half its current age -rnmaking 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, comes from the glow of its interstellar dust.