The 2015 Arctic sea ice minimum summertime extent is the 4th lowest since observations from space began, according to a NASA analysis of satellite data.
Following the July announcement of a big new SETI initiative, a Netherlands astronomer says advanced civilizations are rare or absent from the local universe.
Scientists using the Large Hadron Collider (LHC) have produced tiny droplets of a state of matter thought to have existed right at the birth of the universe.
NASA's Solar Dynamics Observatory sees dozens of Earth eclipses and several lunar transits each year. On September 13, 2015, it saw the two happening at once.
Io's volcanic activity may be due to a unique combination of ordinary gravitational squeezing by Jupiter and friction on molten rock within Io's interior.