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from the star-wars:-where-combatants-toss-stars-at-each-other dept.
How an Advanced Civilization Could Stop Dark Energy From Preventing Their Future Exploration
For the sake of his study, which recently appeared online under the title "Life Versus Dark Energy: How An Advanced Civilization Could Resist the Accelerating Expansion of the Universe", Dr. Dan Hooper considered how civilizations might be able to reverse the process of cosmic expansion. In addition, he suggests ways in which humanity might looks[sic] for signs of such a civilization.
[...] This harvesting, according to Dr. Hooper, would consist of building unconventional Dyson Spheres that would use the energy they collected from stars to propel them towards the center of the species' civilization. High-mass stars are likely to evolve beyond the main sequence before reaching the destination of the central civilization and low-mass stars would not generate enough energy (and therefore acceleration) to avoid falling beyond the horizon.
For these reasons, Dr. Hooper concludes that stars with masses of between 0.2 and 1 Solar Masses will be the most attractive targets for harvesting. In other words, stars that are like our Sun (G-type, or yellow dwarf), orange dwarfs (K-type), and some M-type (red dwarf) stars would all be suitable for a Type III civilization's purposes.
[...] Based on the assumption that such a civilization could travel at 1 – 10% the speed of light, Dr. Hooper estimates that they would be able to harvest stars out to a co-moving radius of approximately 20 to 50 Megaparsecs (about 65.2 million to 163 million light-years). Depending on their age, 1 to 5 billion years, they would be able to harvest stars within a range of 1 to 4 Megaparsecs (3.3 million to 13 million light-years) or up to several tens of Megaparsecs.
In addition to providing a framework for how a sufficiently-advanced civilization could survive cosmic acceleration, Dr. Hooper's paper also provides new possibilities in the search for extra-terrestrial intelligence (SETI). While his study primarily addresses the possibility that such a mega-civilization will emerge in the future (perhaps it will even be our own), he also acknowledges the possibility that one could already exist.
Kardashev scale. One parsec is equivalent to a distance of approximately 3.26156 light years. Corrections made above.
(Score: 2) by legont on Friday June 22 2018, @09:03PM (3 children)
Actually even supernova is not powerful enough to produce the interesting species such as gold and uranium. They think neutron stars collision is the source.
"Wealth is the relentless enemy of understanding" - John Kenneth Galbraith.
(Score: 1) by khallow on Saturday June 23 2018, @02:21AM (2 children)
There's no question that supernova are more than powerful enough. And the process by which they would create such heavy nuclei is known to exist (repeated particle capture by nuclei).
(Score: 3, Interesting) by legont on Saturday June 23 2018, @02:12PM (1 child)
http://news.berkeley.edu/2017/10/16/astronomers-strike-cosmic-gold/ [berkeley.edu]
The reality just changed on you, man; probably by liberals :)
"Wealth is the relentless enemy of understanding" - John Kenneth Galbraith.
(Score: 1) by khallow on Sunday June 24 2018, @01:14AM