This Hubble Space Telescope image shows a star known as R Sculptoris, located 1,500 light-years from Earth, in the constellation of Sculptor. The black region at the centre of the image has been artificially masked.
A view of a phytoplankton bloom near Alaska's Pribilof Islands. The milky green and light blue shading of the water indicates the presence of vast populations of microscopic phytoplankton.
The Horsehead Nebula, as seen with infrared light, shows clouds surrounding it have already dissipated. The Horsehead formation has about 5 million years left before it, too, disintegrates.