This review presents our understanding of cometary dust at the end of 2017. For decades,
insight about the dust ejected by nuclei of comets had stemmed from remote observations …

This chapter reviews the estimates of the dust-to-gas and refractory-to-ice mass ratios
derived from Rosetta measurements in the lost materials and the nucleus of 67P/Churyumov …

The ESA Rosetta spacecraft followed comet 67P at a close distance for more than 2 yr. In
addition, it deployed the lander Philae on to the surface of the comet. The (surface) …

The radio science experiment RSI on-board Rosetta determined the mass of the nucleus of
comet 67P/Churyumov–Gerasimenko at the start of the prime mission from 2014 August to …

The international Rosetta mission was launched in 2004 and consists of the orbiter
spacecraft Rosetta and the lander Philae. The aim of the mission is to map the comet …

We present the analysis of≈ 100 molecular maps of the coma of comet 67P/Churyumov-
Gerasimenko that were obtained with the MIRO submillimeter radiotelescope on board the …

Outbursts occur commonly on comets with different frequencies and scales,. Despite
multiple observations suggesting various triggering processes,, the driving mechanism of …

We review the complex relationship between the dust-to-gas mass ratio usually estimated in
the material lost by comets, and the refractory-to-ice mass ratio inside the nucleus, which …

This review addresses our current understanding of comets that venture close to the Sun,
and are hence exposed to much more extreme conditions than comets that are typically …

Ejection of large boulder-like debris is a vigorous form of cometary activity that is unlikely
induced by water ice out-gassing alone but rather associated with the sublimation of super …