Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collisions of planetesimals and formation of planets   We present preliminary results of terrestrial planet formation using on the
one hand classical numerical integration of hundreds of small bodies on CPUs
and on the other hand -- for comparison reasons -- the results of our GPU code
with thousands of small bodies which then merge to larger ones. To be able to
determine the outcome of collision events we use our smooth particle
hydrodynamics (SPH) code which tracks how water is lost during such events.

32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys