Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collapse and Outflow: Towards an Integrated Theory of Star Formation   Observational advances over the last decade reveal that star formation is
associated with the simultaneous presence of gravitationally collapsing gas,
bipolar outflow, and an accretion disk. Two theoretical views of star formation
suppose that either stellar mass is determined from the outset by gravitational
instability, or by the outflow which sweeps away the collapsing envelope of
initially singular density distributions. Neither picture appears to explain
all of the facts. This contribution examines some of the key issues facing star
formation theory.

17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph