Observations by Cassini orbiter show one of the rings takes longer to cool down, suggesting it is made up of new, dense objects that may have been a moon until recently.
A new method of predicting satellite orbits could speed up their removal from orbit. The results will be tested next year with the Integral satellite.
The observatory will monitor a billion stars over five years. Already the mission has detected supernovae, extreme binary systems and taken over two million parallax measurements.
These hard to spot galaxies could unlock the mystery of galaxy formation
A study of a galaxy cluster 1.6 billion lightyears away has revealed the re-energising power generated when two of these massive cosmic structures collide with one another.
Magnetic waves oscillating in through the Sun may cause the huge temperatures
Samples of the lunar surface brought back by the Apollo missions initially revealed the remnants of ancient lava eruptions that occurred on the Moon. Now, those same samples are helping scientists learn more about the origins of these so-called 'fire fountains'.
Future space travel will rely on a new relationship between man and machine
There is a discrepancy between current theories as to how the gas giants in our Solar System formed and the time it takes for the accretion of rocky cores to occur. New research may have solved the conundrum.
The extreme conditions may have also help kickstart life on other worlds
Our new celestial companions could help us understand how our Galaxy formed
The discovery of a galactic collision that has formed a ring of light close to home has shown that such phenomena can occur around smaller galaxies than previously thought.
Read our pick of the best astronomy and space-related events occurring at the British Science Festival 2015.
Supernovae in empty space may have been thrown out of merging galaxies
A new telescope that is helping astronomers learn more about exoplanets has made its first major discovery; a young Jupiter-like planet beyond the Solar System.
The tiniest supermassive black hole ever found at the centre of a galaxy is providing clues as to how black holes formed along with their host galaxies.
The energy output of the Universe is half of what it used to be
Two studies into elliptical galaxies' star formation have revealed a self-regulating system powered by the jets of black holes.
Dawn has sent back a video of some of Ceres' most intriguing features, causing scientists to ask new questions about the surface of the dwarf planet.