The black hole in the centre of our Milky Way Galaxy has been imaged for the first time, showing a ring of gas encircling the event horizon, beyond which no light can escape.
NASA says the James Webb Space Telescope’s optical system is now in virtually perfect alignment, setting the stage for instrument commissioning and science operations later this summer.
The nucleus of the largest known comet in the Solar System, C/2014 UN271 (Bernardinelli–Bernstein), has been measured by the Hubble Space Telescope to be 129 kilometres across.
In another major milestone, the James Webb Space Telescope has captured first-light images of a star to help engineers align the 18 segments making up its primary mirror.