Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Million-Degree Plasma Pervading the Extended Orion Nebula   Most stars form as members of large associations within dense, very cold
(10-100 K) molecular clouds. The nearby giant molecular cloud in Orion hosts
several thousand stars of ages less than a few million years, many of which are
located in or around the famous Orion Nebula, a prominent gas structure
illuminated and ionized by a small group of massive stars (the Trapezium). We
present X-ray observations obtained with the X-ray Multi-Mirror satellite
XMM-Newton revealing that a hot plasma with a temperature of 1.7-2.1 million K
pervades the southwest extension of the nebula. The plasma, originating in the
strong stellar winds from the Trapezium, flows into the adjacent interstellar
medium. This X-ray outflow phenomenon must be widespread throughout our Galaxy.

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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: stat
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg