Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Sun   The paper is based on lectures on the internal structure and evolution of the
Sun. It contains an outline of observational and theoretical elements of the
Standard Solar Model, emphasizing also recent research results on solar
rotation, magnetic fields, thermonuclear energy generation, and solar activity.

21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat