One of the key goals of the Rosetta mission was to understand how, where and when
comets formed in our solar system. There are two major hypotheses for the origin of comets …

A comet is a highly dynamic object, undergoing a permanent state of change. These
changes have to be carefully classified and considered according to their intrinsic temporal …

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 …

Context. The process of gas-driven ejection of refractory materials from cometary surfaces
continues to pose a challenging question in cometary science. The activity modeling of …

Context. One of the primary goals of the European Space Agency's Rosetta mission to comet
67P/Churyumov-Gerasimenko was to investigate the mechanisms responsible for cometary …

The paper presents the results of spectroscopic measurements for selected dust analogues,
based on which change in cometary brightness was determined. In the first part of the article …

The paper presents new experimental results of measurements of the hemispherical albedo
of a potential comet analogue and an analysis of its influence on the change in the cometary …

Multi-band photometric monitoring of comet 29P/Schwassmann–Wachmann 1 was
conducted with the standard Johnson–Cousins filter set. Observations extended from 2018 …

In the paper we examine two selected mechanisms of matter ejection from the cometary
nuclei. The first is a calm sublimation from the comet's nucleus and the second is the …

Aims. The Rosetta space probe accompanied comet 67P/Churyumov-Gerasimenko for more
than two years, obtaining an unprecedented amount of unique data of the comet nucleus …