Comet 67P/Churyumov-Gerasimenko could lose up to 20 metres of surface material from its previously unilluminated south side when it heats up, starting in May 2015. The increasing heat as the comet approaches the Sun will trigger this 'diet', during which gases and solid materials will be ejected into space.
Planetary scientists have never seen dwarf planet Ceres from this close up. The German-developed Framing Camera on board NASA's Dawn spacecraft acquired this image on 25 January 2015 from a distance of just 237,000 kilometres.
It is still early days for the scientists involved in evaluating data that the 21 instruments on board the Rosetta spacecraft and its Philae lander have transmitted back to Earth. But preliminary results from seven of the 11 instruments on the Rosetta orbiter have been published in a special edition of the journal Science.
Nili Fossae caught the attention of astronomers in the last century, when Mars could only be observed from Earth with ground-based telescopes. The grabens of Nili Fossae extend for several hundred kilometres along the eastern edge of the giant impact basin Isidis Planitia and, together with the volcanic region Syrtis Major, they form a concentric pattern that runs parallel to the edge of the basin.
Planetary scientists at the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) may find a thick ice crust with an ocean underneath when the NASA Dawn spacecraft arrives at Ceres in March 2015. Even now, from a distance of 383,000 kilometres, the first surface features are visible.
The Next-Generation Transit Survey (NGTS) telescope at the Paranal Observatory, operated by the European Southern Observatory (ESO) in the Atacama Desert in northern Chile, has achieved 'first light'.
It follows an elliptical orbit around Mars, undisturbed, almost lonely – the orbiter Mars Express. For 11 years now – to be precise since Christmas Eve 2003 – the first and, for some time now, European Space Agency longest-serving interplanetary mission has been travelling around our planetary neighbour.
With a diameter of nearly 1000 kilometres, it was the largest known asteroid – and yet Ceres, which was 'promoted' from asteroid to dwarf planet in 2006, is just nine pixels wide in the image acquired by the Dawn spacecraft on 1 December 2014.
Philae landed on a comet just three weeks ago; now, another German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) lander mission has been launched – the Mobile Asteroid Surface Scout (MASCOT) is already on its way to Asteroid 1999 JU3.
Originally scheduled for launch at 05:24 CET on 30 November 2014, the MASCOT asteroid lander will now set off from Tanegashima Space Center on board the Japanese Space Agency (JAXA) orbiter Hayabusa 2 no earlier than 1 December, destined for asteroid 1999 JU3.