One of the last looks at Saturn and its main rings from a distance as captured by the spacecraft Cassini.
Photo-Reuters 

he Diamond Ring effect is seen as the moon makes its final move over the sun during the total solar eclipse above Madras, Oregon, August 21. Photo-Reuters

The spacecraft Cassini is pictured above Saturn's northern hemisphere prior to making one of its Grand Finale dives in a NASA illustration. Photo-Reuters

A view of Saturn's moon Dione, looking toward the Saturn-facing side. When viewed from a distance with the sun directly behind Cassini, the larger, brighter craters stand out. Photo-Reuters 

The collision of two black holes - an event detected for the first time ever by the Laser Interferometer Gravitational-Wave Observatory, or LIGO - is seen in this still from a computer simulation. Photo-Reuters 

A composite image of 21 separate photographs taken with a single fixed camera shows the solar eclipse as it creates the effect of a diamond ring at totality as seen from Clingmans Dome, the highest point in the Great Smoky Mountains National Park, Tennessee. Photo-Reuters 

A photo by a member of the Expedition 52 crew aboard the International space Station shows one of the 16 sunrises they experience every day, as the orbiting laboratory travels around Earth. Photo-Reuters 

Orbital ATK's Cygnus spacecraft approaches the International space Station in a photo taken by Expedition 51 Flight Engineer Thomas Pesquet of the European space Agency. Photo-Reuters 

A photo taken in August by an astronaut aboard the International space Station of solar evaporation ponds outside the city of Moab, Utah, part of an operation to mine potassium chloride. Each pond color indicates a different state of evaporation. Photo-Reuters 

A medium-sized (M2) solar flare and a coronal mass ejection (CME) erupting from a large active region of the Sun in July. The flare lasted almost two hours. Photo-Reuters 

The Calabash Nebula shows the death of a low-mass star like the Sun. This image taken by the Hubble space Telescope shows the star going through a transformation from a red giant to a planetary nebula, during which it blows its outer layers of gas and dust out into the surrounding space . Photo-Reuters 

A composite image of the Crab Nebula, a supernova remnant, assembled by combining data from five telescopes spanning nearly the entire breadth of the electromagnetic spectrum: the Karl G. Jansky Very Large Array, the Spitzer space Telescope, the Hubble space Telescope, the XMM-Newton Observatory, and the Chandra X-ray Observatory. Photo-Reuters 

An image taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter shows spring in the Northern hemisphere, with snow made of carbon dioxide, or dry ice, covering dunes. Photo-Reuters 

A view of the surface of Mars, with flow features commonly found at the base of slopes. These features are bound by ridges that resemble terrestrial moraines, suggesting that these deposits are ice-rich, or may have been ice-rich in the past. Photo-Reuters