The dense objects imaged by Hubble weigh as much as our own galaxy, but are less than 1/10th as large (Illustration: NASA/ESA/A Field/STScI/P van Dokkum/Yale U) The stars in the ultra-compact galaxies are packed together 50 to 100 times more densely than in the Sun’s neighbourhood. If there are any planets in these galaxies, their skies would be filled with 200 times as many stars as Earth’s sky (Image: NASA/ESA/P van Dokkum/Yale/M Franx/Leiden U/G Illingworth/UCSC/Lick Obs)
Tiny galaxies littered the early universe – but where are they now?
A team led by Pieter van Dokkum at Yale University measured the light…
