Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The reliability of the Titius-Bode relation and its implications for the
  search for exoplanets   The major semiaxes of the planets in our Solar System obey a simple geometric
progression known as the Titius-Bode Relation (TBR), whose physical origin
remains disputed. It has been shown that the exoplanetary systems follow a
similar (but not identical) progression of the form a_n= a_0 e^(bn), where a_0,
b are constants to be determined for each system. Since its formulation, the
Titius-Bode Relation has proved to be highly predictive in our Solar System.
Using data from 27 exoplanetary systems with 5 or more planets and applying a
proposed method, we conclude that reliable TB-like fits can be obtained for
systems with at least 4 planets and that the precision of the TBR is 78%. By
means of a statistical test we show that the periods of planets in real
exoplanetary systems are not consistent with a random distribution. Rather,
they show signs that their configuration is shaped by their mutual
interactions.

34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio