alien bright lights, big city could reveal et - solar street lighting system
Lisa Grossman civilization can give herself away at night
The time of their city shines.
If there is one lurking around our solar system, we can find it.
Existing telescopes can find Tokyo-sized cities on the edge of the solar system, and future telescopes can detect them well.
A new study shows that there are bright planets around other stars.
"This opens a new window for finding alien civilizations," said Avi Loeb of Harvard University . ".
Mainstream search of alien intelligence (SETI)
Now that it has been in operation for more than 50 years, it is hoped that aliens will either leak or broadcast radio signals into space.
However, in recent years, with the transition to cable and ground television, the radio voice of the human self has softened
When our city becomes brighter, satellite broadcasting.
Leeb and Edwin Turner of Princeton University believe that if we are guides, alien hunters should turn to the light of the city.
If ET builds a thing in Tokyo that's unlikely to happen
Loeb calculates that, in addition to Neptune, the Hubble Space Telescope can detect its sparkling lights on a cold object in the koiber belt.
The distance from the Earth to the objects in the koiber belt changes as they run around the sun.
However, depending on the light source, the brightness of the object will vary depending on the number.
This is because light is exponentially decreasing according to the distance it travels.
Therefore, the light from the object will vary depending on the light from the sun, spread to the object, and then be reflected back to the telescope.
Observing how the brightness of an object changes with distance should allow astronomers to distinguish the world in which someone lives from the one that is just Sunny. Even ground-
Artificial lighting and colon should be detected based on telescopes;
He said they could distinguish between the spectral features of sunlight flashing from objects in the koiber belt and the direct glow of alien street lights.
"It should be possible to know what light source is being used," he said . ".
"The existing astronomical facilities can detect artificial light in a single city.
Loeb admits that it is a long process to discover technically advanced aliens in the periphery of our solar system, because they are far from life --
Give the light of the sun.
But he said astronomers should look for them anyway.
The upcoming survey, like the one planned for a future large weather measuring telescope, will already collect light from thousands of koibel-belt objects.
"Many people may say it is extremely impossible, so why do you do it? ” says Loeb.
"But if we can do this without the extra consumption of resources, why not?
Greg Laughlin, of the exoplanets at the University of California Santa Cruz Research Department, believes that this is "a good SETI search strategy", although he is skeptical about the aliens in the koibel belt.
"I would like to bet that there are no artificial lighting objects in our solar system.
I may lose, of course.
However, future space telescopes can look for artificial light on exoplanets.
"The idea has the best applicability outside the solar system," Laughlin said . ".
Of course, there may be some practical pitfalls in this plan.
Last weekend, after a freak snowstorm, Leeb's home was out of power for three days and he thought, "I hope the aliens don't use [the same]
Otherwise, their lighting will be inconsistent.
"Journal reference and colon; arxiv. org/abs/1110.