Images from last week's flyby of Saturn's moon Enceladus, one of three planned for this month ... the final close flybys of Enceladus with the Cassini spacecraft.
The flybys are part of a series of "lasts" for Cassini, whose mission to Saturn ends next year. Last chance for many years to see new up-close views of this fascinating, geologically active Saturn moon.
Astronomers studied 35 galaxies with a newly upgraded radio telescope in New Mexico to learn more about galactic halos. This study confirms a 1961 prediction.
Icy glaciers and perennial snow patches provide a home or resting place for 19 species of birds and 16 species of mammals - 17, if humans are included.