Science

The far side of the moon. NASA/GSFC/Arizona State University hide caption

A view of the Colorado River in southern Utah and northern Arizona. NASA hide caption

NASA's Voyager 2 spacecraft gave humanity its first glimpse of Neptune and its moon Triton in the summer of 1989. This picture of Neptune was produced from the last whole planet images taken through the green and orange filters on the Voyager 2 narrow angle camera on Aug. 20, 1989. NASA hide caption

A NASA poster imagines what it might be like to "planet hop" from the planet called TRAPPIST-1e, 40 light-years from Earth. NASA-JPL/Caltech hide caption

This artist's impression shows the surroundings of a supermassive black hole, typical of that found at the heart of many galaxies. The black hole itself is surrounded by a brilliant accretion disc of very hot, infalling material and, further out, a dusty torus. There are also often high-speed jets of material ejected at the black hole's poles that can extend huge distances into space. L. Calçada/ESO hide caption

This artist's view shows an exoplanet orbiting the young star Beta Pictoris. The exoplanet has an eight-hour day — and a much faster rotation than any planet in the solar system. L. Calçada/N. Risinger/ESO hide caption

Cajal summarizes many of the properties of astrocytes in this drawing of the hippocampus of a man three hours after death. Courtesy Instituto Cajal del Consjo Superior de Investigaciones Científicas, Madrid, © 2017 CSIC hide caption