Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Dust in the 21st Century   The past century of interstellar dust has brought us from first ignoring it
to finding that it plays an important role in the evolution of galaxies.
Current observational results in our galaxy provide a complex physical and
chemical evolutionary picture of interstellar dust starting with the formation
of small refractory particles in stellar atmospheres to their modification in
diffuse and molecular clouds and ultimately to their contribution to star
forming regions. Observations of the properties of dust in very young galaxies
will be an important probe of the rates of star formation in terms of the
production and destruction of dust grains. Future observations of dust at high
spectral and spatial resolution will provide detailed information on processes
in collapsing clouds up to star formation. Space missions to comets in the next
century will first study them in situ but ultimately will bring back pristine
nucleus material which will contain the end product of the collapsing
protosolar molecular cloud at the time of planet formation. If one of the
current theories of the origin of life from comets is correct, laboratory
studies of comet dust grains immersed in water may give direct indications of
prebiotic chemical evolution.

29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics