Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Virgo Cluster   In the era of precision cosmology the Virgo cluster takes on a new role in
the cosmic distance scale. Its traditional role of testing the consistency of
secondary distance indicators is replaced by an ensemble of distance
measurements within the Local Supercluster united by a velocity field model
obtained from redshift survey based reconstruction. WMAP leads us to see the
Hubble Constant as one of six parameters in a standard model of cosmology with
considerable covariance between parameters. Independent experiments, such as
WMAP and the HST Key Project (and their successors) constrain these parameters.

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The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ