Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Archaeology in a Vacuum: Obstacles to and Solutions for Developing a
  Real Space Archaeology   This paper outlines some of the difficulties faced by archaeologists studying
human activity in outer space. The International Space Station Archaeological
Project has identified solutions to these problems, including the use of
historic photographic archives and documentation of discard practices such as
processes associated with the return of space-flown items to Earth.

31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph