Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Earth-like Habitats in Planetary Systems   Understanding the concept of habitability is related to an evolutionary
knowledge of the particular planet-in-question. Additional indications
so-called "systemic aspects" of the planetary system as a whole governs a
particular planet's claim on habitability. Here we focus on such systemic
aspects and discuss their relevance to the formation of an 'Earth-like'
habitable planet. We summarize our results obtained by lunar sample work and
numerical models within the framework of the Research Alliance "Planetary
Evolution and Life". We consider various scenarios which simulate the dynamical
evolution of the Solar System and discuss the likelihood of forming an
Earth-like world orbiting another star. Our model approach is constrained by
observations of the modern Solar System and the knowledge of its history.
Results suggest that the long-term presence of terrestrial planets is
jeopardized due to gravitational interactions if giant planets are present. But
habitability of inner rocky planets may be supported in those planetary systems
hosting giant planets.
  Gravitational interactions within a complex multiple-body structure including
giant planets may supply terrestrial planets with materials which formed in the
colder region of the proto-planetary disk. During these processes, water, the
prime requisite for habitability, is delivered to the inner system. This may
occur either during the main accretion phase of terrestrial planets or via
impacts during a post-accretion bombardment. Results for both processes are
summarized and discussed with reference to the lunar crater record.
  Starting from a scenario involving migration of the giant planets this
contribution discusses the delivery of water to Earth, the modification of
atmospheres by impacts in a planetary system context and the likelihood of the
existence of extrasolar Earth-like habitable worlds.

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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con