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Seager is interested in predicting our chances of detecting any kind of life within the next ten years.
“We’re actually on a different track, where we’re trying to find signs of life on another planet,” she says, “and the only way we know how to do this right now is by remote sensing.” In other words, spectroscopic imaging — the process of splitting the light up from a planet or any star and trying to identify what gases are present by what they have removed or added to the light. “Just like on Earth where we have satellites that look down to measure gas concentrations, we can use space telescopes to look at the atmospheres of planets far away,” she explains. “We’re going to look for gases that essentially don’t belong — gases that may be produced by life.”
If Sara Seager is right, and there are only a few civilisations in the Universe, then we would have to travel for billions of years at the speed of light, surveying billions of galaxies, before we eventually find another civilisation.
This is fascinating, as one can actually come up with a current "number", using today's technology:
N = 2
Originally posted by charles1952
Time for a foolish question.
FL is given as the fraction with life. The fraction she uses is 1. One? If it's a fraction, that must mean all of them. What in the world (or some other world) is going on?
Is she saying that out of the 30,000 stars there is only 1 M Class? If so, then it's not properly labelled as FL.
I give up.edit on 24-6-2013 by charles1952 because: add
Originally posted by gort51
N = Number of planets that may have habitable zones.....and show anomolous gasses thru sprectothingimebob.
So the formula is using 30,000 stars only, therefore @ 30,000 stars etc etc as per the explanation...................
N = 2 Planets out of 30,000 star systems, may have those special "Life" gasses.
But there are MILLIONS of star systems just in our own Galaxy....therefore N would be greater...BUT we cant detect via spectrothingamebob, all the stars in our own little Galaxy.
But at least they are trying, and its a start. (Why they just dont ask the Aliens already here, I dont know )