Front Cover:
NASA's Hubble Space Telescope has unveiled in stunning detail a small section of the expanding remains of a massive star that exploded about 8,000 years ago. The wisps of gas are all that remain of what was once a star 20 times more massive than our sun. The fast-moving Called the Veil Nebula, the debris is one of the best-known supernova remnants, deriving its name from its delicate, draped filamentary structures. The entire nebula is 110 light-years across, covering six full moons on the sky as seen from Earth, and resides about 2,100 light-years away in the constellation Cygnus, the Swan.
Image Credit: NASA/ESA/Hubble Heritage Team

Back cover:
True colour picture of Pluto. Also, Pluto's haze layer shows its blue color in this picture taken by the New Horizons Ralph/Multispectral Visible Imaging Camera (MVIC). The source of the haze likely involves sunlight-initiated chemical reactions of nitrogen and methane, leading to relatively small, soot-like particles (called tholins) that grow as they settle toward the surface. This image was generated by software that combines information from blue, red and near-infrared images to replicate the color a human eye would perceive as closely as possible. 
Photo credit: John Hopkins University: pluto.jhupl.edu

Front Inside Cover: Cartoon

Back Inside Cover:
Comet 67P/Churyumov-Gerasimenko captures with OSIRIS, a wide-angle camera, from a distance of 30 km. The nucleus of the comet is deliberately overexposed in order to reveal the faint jets of activity.
Credits: ESA/Rosetta/MPS for OSIRIS Team, MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA