Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NASA's Future Missions in X-ray Astronomy   The NASA program in X-ray astronomy has two long term goals: 1) to achieve
sufficient angular resolution to image the event horizon of a black hole (0.1
micro arc sec) and 2) to achieve sufficient collecting area (50-150 sq m) and
angular resolution (0.1-1.0 arc sec) to observe in detail the first black holes
and galaxies at high redshift. These ambitous goals can be used to map out a
series of missions and a technology program. The next major mission will be
Constellation-X which will be dedicated to high resolution X-ray spectroscopy
for launch in ~2010. This mission is a critical step in the roadmap to achieve
these goals. Following Constellation-X NASA is considering two very ambitious
vision missions: MAXIM and Generation-X that will achieve the ultimate
capabilities. The modest missions Astro-E2 and Swift address more focussed
science goals on a rapid development cycle and provide important pathfinders to
the larger missions.

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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: cs