Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Wilkinson Microwave Anisotropy Probe   The Wilkinson Microwave Anisotropy Probe (WMAP) has mapped the full sky in
five frequency bands between 23 and 94 GHz. The primary goal of the mission is
to produce high-fidelity, all-sky, polarization-sensitive maps that can be used
to study the cosmic microwave background. Systematic errors in the maps are
constrained to new levels: using all-sky data, aspects of the anisotropy may
confidently be probed to sub-microKelvin levels. We give a brief description of
the instrument and an overview of the first results from an analysis of maps
made with one year of data. The highlights are (1) the flat Lambda-CDM model
fits the data remarkably well, whereas an Einstein-de Sitter model does not;
(2) we see evidence of the birth of the first generation of stars at z ~ 20;
(3) when the WMAP data are combined and compared with other cosmological
probes, a cosmic consistency emerges: multiple different lines of inquiry lead
to the same results.

36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys