On June 27, 2015, NASA's Interface Region Imaging Spectrograph, or IRIS, mission will celebrate its second year in space. IRIS observations have advanced our understanding of what role the interface region, which lies between the sun's photosphere and corona, plays in powering its dynamic million-degree atmosphere and driving the solar wind.
NASA GISS: Research Projects & Groups: Astrobiology - Snow and Sea Ice coverage from a Sturtian (~715 Mya) "Snowball Earth" simulation. Forcings applied include a reduction of solar insolation to 94% of modern and 40 ppm CO2). The position of the sea ice front is approximately stable by year 500, suggesting that a "hard snowball" solution (i.e., total Earth sea ice cover) may not be achievable for this particular set of climate forcings.