Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GAIA -- Composition, Formation and Evolution of our Galaxy   GAIA will provide a multi-colour photometric and astrometric census of some
one billion compact sources, complete to 20th magnitude. In addition, spectra
for radial velocities will be obtained for about 30 million stars brighter than
V=17. The high spatial resolution and astrometric precision, 0.1arcsec and
10microarcsec to V=15, will not only quantify the distribution of mass and the
stellar populations in the Galaxy, but make major advances in fundamental
physics, cosmology and solar system science. GAIA is an ESA mission, scheduled
for launch in mid-2011. A full description of the GAIA project and science
case, fairly crediting the hundreds of contributors, is available in the
project `Red Book' [ESA-SCI(2000)4]. A brief overview is provided by Perryman,
de Boer, Gilmore, et al (2001). The www site is http://www.rssd.esa.int/GAIA/

8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ