Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impact Angle Influence in High Velocity Dust Collisions during
  Planetesimal Formation   We have examined the influence of impact angle in collisions between small
dust aggregates and larger dust targets through laboratory experiments. Targets
consisted of \mum-sized quartz dust and had a porosity of about 67%; the
projectiles, between 1 and 5 mm in diameter, were slightly more compact (64%
porosity). The collision velocity was centered at 20 m/s and impact angles
range from 0{\deg} to 45{\deg}. At a given impact angle, the target gained mass
for projectiles smaller than a threshold size, which decreases with increasing
angle from about 3 mm to 1 mm. The fact that growth is possible up to the
largest angles studied supports the idea of planetesimal formation by sweep-up
of small dust aggregates.

8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph