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Since the number of stars is now known to be more bountiful, the number of planets orbiting red dwarfs is also elevated. This, of course, also raises the number of possible life-harboring planets there might be, van Dokkum added.
But enough exoplanet research has been done so far that a cautious prediction can be made that the odds are that the planet will orbit an M (red) dwarf star found in surveys taken within 100 light-years of Earth. Red dwarfs are much more numerous than sun-like stars, which exponentially increases the chances of being life favorable.
One such instrument (and there are only handful of them in the world) can see one part in a million of the sky. So if you happen to be looking on exactly the right frequency, at exactly the instant the Call comes in, there's still a 99.9999% chance you'll be pointing the wrong way.
This means that at 110 light-years away from earth — the edge of a radio ‘sphere’ which contains many star systems — our very first radio broadcasts are beginning to arrive. At 74 light-years away, television signals are being introduced. Star systems at a distance of 50 light-years are now entering the ‘Twilight Zone’.
As radio signals leave earth, they propagate out in a wave form. Just like dropping a stone in a lake, the waves diffuse or “spread out” over distance thanks to the exponentially larger area they must encompass..... the strength of a radio signal will be only 1/4 as great once you are twice the distance from the source. At ten times the distance, the strength of the signal would only be one hundredth as great.
..all of our terrestrial radio signals become indistinguishable from background noise at around a few light-years from earth
Lets say that the nearest star to Earth has intelligent life... Proxima Centauri is about 4.2 some odd light years from Earth. IF they were broadcasting standard radio waves we probably wouldn't be able to detect them due to signal degredation.
The problem is that the number that people consider as being " a s***load of planets", represents in reality next to nothing compared to the vastness of galaxies/Universe and the amount of planets in this space. It all comes down to a scale problem IMO.
reply to post by H34T533K3R
Yes, I heard that.
8 billion is a very liberal estimate. The solar systems that have been looked at so far do not have Earth sized rocky planets as a general rule. But, it is early in the planet finding process, so time will eventually tell.
So, just a personal opinion: closer to 400 million Earth Sized rocky planets. Did you know that many stars are still too young to have fully developed planets? Places like Vega are barely 500 million years old, the Pleiades even younger.
Cornell University says that there are 100 billion stars in the Milky Way.
Most of these are "K" and "M" class. Except for very bright "K" class (K0, K1) stars, there is a rapidly decreasing probability of finding complex life, never mind "complex sentient".
Science and especially MSM likes to exaggerate things to make for better "stories".
So, while the "actual count" may begin to approach 8 billion, those that could contain Human like life, or are even interesting, are far fewer. I'll stick with the 400 million...galaxy wide, and only about 10 local space-faring species.
Yeah, it's that old argument. Somebody says that the galaxy/universe has all these various planets that could potentially evolve life on them that might be similar to our own. (Which, face it, is the only kind we're really interested in.) Oh, the galaxy is loaded with intelligent life! It's everywhere!
Okay, then why haven't we detected it?
JadeStar; Supposing that such a thing as a warp drive is possible, has any thought been given to detecting the sort of energy emissions these would be expected to give off ?
I'm thinking of interstellar particles being pushed along in the wake of warped space. I wondering what sort of energy signature would be produced. What should we look for ?
reply to post by carewemust
Lets just say 100 billion galaxies (a nice round number)
and lets assume that 8 billion in each galaxy had earth like planets.
So that's 800 Billion earth like planets.
You misunderstand this.
The majority of the stars indeed are G through M. These are exactly the types of stars we expect to find complex, and perhaps even complex sentient life around.
On the lower end of the mass/temperature scale M-dwarfs live much longer than our Sun and many are already far older (8 billion years compared to our sun). Next up from them are K stars. The most likely places for advanced life because again, they live longer than G stars like our sun and many are already older than our Sun.
If the majority of stars were hotter and more short lived than our sun then that would be a problem. The fact that the majority are about the same or cooler/older than our sun is more encouraging for life, complex life and perhaps even intelligent complex life.