The ALMA radio telescope array has spotted what appears to be the merger of two galaxies in the infant universe, the earliest such encounter yet observed.
Stars and long streams of gas are torn away from a galaxy as it plows through the heart of a cluster near the centre of the Great Attractor in a phenomenon known as ram pressure stripping.
Engineers are studying plans for a future “starshade” that would block out a star’s light, allowing a distant telescope to directly image smaller exoplanets.
Imaged by the Hubble Space Telescope, the active Seyfert galaxy NGC 4051 has hosted at least three supernovae since 1983 that were visible to ground- or space-based telescopes on Earth.
Engineers are making preparations to attach a small drone-like helicopter to the Mars 2020 rover; a webcam is now available to monitor the rover’s assembly.