A WISE search for large extraterrestrial civilizations
Δημοσιεύθηκε στις 5 Δεκ 2013
Speaker
Jason T. Wright, Penn. State University
Abstract:
If
alien civilizations exist throughout the universe, many have had
billions of years to develop technology, expand their population and
energy supplies, and travel across their galaxies. Kardashev classified
hypothetical advanced civilizations by the magnitude of their power
supply, with Type II civilizations harnessing most of the energy output
of their host star, and Type III civilizations using most of the power
in their galaxy. As Dyson pointed out in 1960, the waste heat emitted
by a such civilizations would easily overwhelm that of their host star
or galaxy, distinguishing them from "normal" astrophysical sources.
This approach to SETI makes few assumptions about the behavior of alien
civilizations, primarily: conservation of energy, the laws of
thermodynamics, and that given the age of the Universe aliens have had
time to develop very large energy supplies.
The WISE all-sky
mid-infrared survey has dramatically improved our ability to detect such
civilizations and to distinguish them from "natural" astrophysical
sources. I will discuss our team's efforts to identify candidate Type
II civilizations in the Milky Way and Type III civilizations throughout
the low-redshift universe. Because the scope and assumptions of this
approach are complementary to those of telecommunication SETI, a null
result has the potential to rule out broad classes of proposed
resolutions to the Fermi-Hart Paradox, particularly those that invoke
organization of advanced alien species across the Milky Way.
Edited by Joe Castrovinci
Jason T. Wright, Penn. State University
Abstract:
If
alien civilizations exist throughout the universe, many have had
billions of years to develop technology, expand their population and
energy supplies, and travel across their galaxies. Kardashev classified
hypothetical advanced civilizations by the magnitude of their power
supply, with Type II civilizations harnessing most of the energy output
of their host star, and Type III civilizations using most of the power
in their galaxy. As Dyson pointed out in 1960, the waste heat emitted
by a such civilizations would easily overwhelm that of their host star
or galaxy, distinguishing them from "normal" astrophysical sources.
This approach to SETI makes few assumptions about the behavior of alien
civilizations, primarily: conservation of energy, the laws of
thermodynamics, and that given the age of the Universe aliens have had
time to develop very large energy supplies.
The WISE all-sky
mid-infrared survey has dramatically improved our ability to detect such
civilizations and to distinguish them from "natural" astrophysical
sources. I will discuss our team's efforts to identify candidate Type
II civilizations in the Milky Way and Type III civilizations throughout
the low-redshift universe. Because the scope and assumptions of this
approach are complementary to those of telecommunication SETI, a null
result has the potential to rule out broad classes of proposed
resolutions to the Fermi-Hart Paradox, particularly those that invoke
organization of advanced alien species across the Milky Way.
Edited by Joe Castrovinci
AΝΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 21/2/2014
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου