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 …

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 …

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 …

Dust and gas outbursts are recurrent cometary phenomena, playing a crucial role in sha**
the coma. Proposed outburst trigger mechanisms include cliff collapse, pressure pockets …

Aims. We present the most extensive catalog of exposures of volatiles on the
67P/Churyumov-Gerasimenko nucleus generated from observations acquired with the …

Comets can be regarded as active planetary bodies because they display evidence for
nearly all fundamental geological processes, which include impact cratering, tectonism, and …

Abstract We present Hubble Space Telescope observations of a photometric outburst and
splitting event in interstellar comet 2I/Borisov. The outburst, first reported with the comet …

Exocomets are small bodies releasing gas and dust which orbit stars other than the Sun.
Their existence was first inferred from the detection of variable absorption features in stellar …

We review the development of dust science from the first ground-based astronomical
observations of dust in space to compositional analysis of individual dust particles and their …

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 …