This centric diatom, photographed through a microscope, measures about 70 microns across and lived in the Indian Southern Ocean during the Holocene.

Astronomers trace the striking pattern to an encounter between a big galaxy and a much smaller one some 50 million years ago.

Just when you think you’ve seen them all, someone comes up with something new and unusual, like the concentric rings of this automated perpetual calendar. What we really like about the design ...

The galaxy, officially named LEDA 1313424, lies approximately 567 million light-years away in the constellation Pisces.