Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lunar Palaeoregolith Deposits as Recorders of the Galactic Environment
  of the Solar System and Implications for Astrobiology   One of the principal scientific reasons for wanting to resume in situ
exploration of the lunar surface is to gain access to the record it contains of
early Solar System history. Part of this record will pertain to the galactic
environment of the Solar System, including variations in the cosmic ray flux,
energetic galactic events (e.g, supernovae and/or gamma-ray bursts), and
passages of the Solar System through dense interstellar clouds. Much of this
record is of astrobiological interest as these processes may have affected the
evolution of life on Earth, and perhaps other Solar System bodies. We argue
that this galactic record, as for that of more local Solar System processes
also of astrobiological interest, will be best preserved in ancient, buried
regolith ('palaeoregolith') deposits in the lunar near sub-surface. Locating
and sampling such deposits will be an important objective of future lunar
exploration activities.

10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci