Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Williams et al. Reply (to the Comment by Dumin on "Progress in Lunar
  Laser Ranging Tests of Relativistic Gravity")   A decreasing gravitational constant, G, coupled with angular momentum
conservation is expected to increrase a planetary semimajor axis, a, as \dot
a/a=-\dot G/G. Analysis of lunar laser ranging data strongly limits such
temporal variations and constrains a local (~1 AU) scale expansion of the solar
system as \dot a/a=-\dot G/G =-(4\pm9)\times10^{-13} yr^{-1}, including that
due to cosmological effects.

20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex