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Exo planets

I have been reading an article in bild der wissenschaft about exo planets. Some interesting facts:
# Meanwhile many thousand (~3500) exo planets have been discovered by astronomers
# First discoveries have been made in 1990 already, but with the help of the Kepler telescope since 2013 there has been a dramatic boost in number of discoveries
# With the help of an Earth Similarity Index scientist have created a top 10 list of planets similar to Earth.
# Milkyway contains more planets than stars. Based on discoveries made so far it can be estimated that Milkyway contains ~20.000 planets similar to Earth

5 blog comments below

Cool Now how many have intelligent life?
standready on Mon Feb 20, 2017 6:33 pm
This I guess is much harder to detect. But may be some time technology has advanced to a level allowing us for instance to spot artificial satellites in the orbit of planets, or to capture some signals. Finding life on these planets is the next logical step though.
amagard on Tue Feb 21, 2017 9:43 am
First solar system discovered with seven Earth-like planets:

NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.

amagard on Thu Feb 23, 2017 9:06 am
amagard wrote:
Finding life on these planets is the next logical step though.

I'd disagree. We're currently limited in our ability to even detect moderate to small sized rocky planets... let alone determine anything about their composition - surface materials, atmosphere, etc. etc. The next logical step is developing the tech to get more physical data on these sorts of planets beyond luck-of-the-draw spectral info from their star that might pass through their thin atmospheres to us.

The ability to detect artificial satellites, or life... those are much further down the road... several logical steps away.
Ankhanu on Thu Feb 23, 2017 7:03 pm
standready on Fri Feb 24, 2017 12:38 am

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