Originally posted by Xaphan
I agree that there is life elsewhere in the universe. There has to be. If you were to consider the universe as being every beach on this planet, earth
would just be one grain of sand. This can't be it.
I gave you a flag for the good thread, and a star for the puppy
It would require 28,000-plus earths to approximate the number of stars (200+ sextillion) to grains of sand (7+ quintillion). So what you're saying is
for every ~28,000 stars, there's an earth.
Our galaxy is supposed to have 100 billion stars. If this 1 in 28,000 stars prediction is true then that would mean 3.5 million earths. HOWEVER,
recent surveys have estimated there're 2 BILLION earth analogs in our galaxy. This doesn't mean they have water and life, but they're very earth-like
in most ways. But since an earth analog isn't EQUAL to earth, your figure may still remain true.
These numbers I cite aren't EXACT, but they're close, I believe.
Further, to back up my reference to 2 BILLION earth analogs, here:
www.space.com - New Estimate for Alien Earths: 2 Billion in Our Galaxy
After the researchers analyzed the four months of data in this initial batch of readings from Kepler, they determined that 1.4 to 2.7 percent of all
sunlike stars are expected to have Earthlike planets — ones that are between 0.8 and two times Earth's diameter and within the habitable
zones of their stars.
"This means there are a lot of Earth analogs out there — two billion in the Milky Way galaxy," researcher Joseph Catanzarite, an astronomer at
NASA's Jet Propulsion Laboratory, told SPACE.com. "With that large a number, there's a good chance life and maybe even intelligent life might exist on
some of those planets. And that's just our galaxy alone — there are 50 billion other galaxies."
Please keep in mind earth-like is not equal to an earth analog. Well, not in the way that I'm familiar with the term. They believe there're tens of
billions of earth-like planets, but these can be 10 times larger and around suns different than our own. They often will call these super earths.
There's also disagreement about the number of stars. They estimate 100 billion, but it's very likely this is far too low. Based on what I've read,
there could be up to a trillion stars in the Milky Way. This is due to the fact many of them are smaller and our measurements aren't perfect.
And I don't believe I've mentioned rogue planets? They estimate anywhere from hundreds of billions to 100 quadrillion in our galaxy. It's possible
they could sustain life for short periods with the right conditions. But this is unlikely as a lot of things would have to come together for it to
Neither did I mention all the comets and dwarf-planets and asteroids and moons. Folks, when you do the numbers, there's a tremendous undeniable
potential for life in the universe. Do not fall for the doubts that many appeal to. They're not paths to the truth, but alleyways to no where. And who
wants to be no where? Is there a way to fall through the universe into nothing?
One day not far away we will be able to run planetarium software and look at all these planets out here. And then we will view them through deep space
telescopes with clarity. We will get to know them. I suspect we'll even figure out ways to detect life in the minute amounts of light we receive from
them. Further, we'll begin to speculate what kind of life exists there. It's hard to say, maybe impossible, what we'll do because science changes and
we learn new things.
I found this interesting link about what magnification is needed to see extrasolar planets:
How Powerful a Telescope Must be to See Earth From 20 Light Years Away?...
According to that, we need magnification on the scale of billions. Since we cannot get a clear image of anything beyond 300x on earth (although
software has been recently used), the telescope will probably be in space. How that's done or where I don't know. I don't even know if a billion
magnification is possible. I just assume somebody smart will eventually figure it out. The strange thing is some alien out there might actually be
looking at earth right now. Why not? S*** for giggles!
edit on 10-2-2013 by jonnywhite because: (no reason given)