Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The age of the oldest globular clusters   The age of three of the oldest clusters -- M15, M68, M92 -- has been
redetermined. We use the latest EOS and opacity data available for calculating
both isochrones and zero age horizontal branches and employ the brightness
difference between turn-off and horizontal branch to determine the cluster age.
Our best ages for all three clusters are about 13 Gyr, and even smaller ages
are possible. Our results help to reconcile cluster ages with recent results on
the age of the universe determined from the Hubble constant.

24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn