This image released Monday by Harvard-led researchers represents the gravitational waves in the Cosmic Microwave Background in the microsecond after the Big Bang.
Harvard-Smithsonian Center for Astrophysics
A computer simulation of the formation of large-scale structures in the Universe, showing a patch of 100 million light-years and the resulting coherent motions of galaxies flowing towards the highest mass concentration in the centre. The snapshot refers to an epoch about 10 billion years back in time.
Klaus Dolag/VIMOS-VLT Deep Survey/ESO
Don't panic! The end of the Universe (as we know it) isn't likely to hit us for billions of years, if it comes at all. Pictured: the Milky Way rises above the ESO's ALMA facility in Chile.
José Francisco Salgado/ESO