Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Internalizing Null Extraterrestrial "Signals": An Astrobiological App
  for a Technological Society   One of the beneficial outcomes of searching for life in the Universe is that
it grants greater awareness of our own problems here on Earth. Lack of contact
with alien beings to date might actually comprise a null "signal" pointing
humankind toward a viable future. Astrobiology has surprising practical
applications to human society; within the larger cosmological context of cosmic
evolution, astrobiology clarifies the energetic essence of complex systems
throughout the Universe, including technological intelligence that is
intimately dependent on energy and likely will be for as long as it endures.
The "message" contained within the "signal" with which today's society needs to
cope is reasonably this: Only solar energy can power our civilization going
forward without soiling the environment with increased heat yet robustly
driving the economy with increased per capita energy usage. The null "signals"
from extraterrestrials also offer a rational solution to the Fermi paradox as a
principle of cosmic selection likely limits galactic civilizations in time as
well as in space: Those advanced life-forms anywhere in the Universe that
wisely adopt, and quickly too, the energy of their parent star probably
survive, and those that don't, don't.

8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat