Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ancient Australian Rocks and the Search for Life on Mars   We discuss the results of a remote sensing study that has revealed new
details about an important rock unit dominated by two minerals that can be
associated with volcanism (olivine) and life (carbonate). The study, which used
a new analysis technique on CRISM data, identified a region where no carbonates
or clays are present, only large grain size olivine. This discovery shines new
light on the formation and history of the olivine-carbonate rock within Jezero
crater that will be explored by the Mars 2020 rover.

12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th