by Sixstrings » Sun 14 Dec 2014, 16:08:34
$this->bbcode_second_pass_quote('Strummer', 'N')o they aren't. "Nature" is specific to this planet, separated by empty space from other planets, and shielded from radiation by the atmosphere and the magnetic field. It could be that there are biospheres on other planets, but they are totally separated and most likely completely different from our nature.
No, they are not "totally separated."
It's actually likely that life was planted on earth via meteor impact from somewhere else. And if it did originite here then material from earth has possibly already seeded other planets.
It's not a closed system, at all.
Throughout the solar system evolution there has been exchange between planets, from impacts. A big meteor crashed into mars and that sent material flying out and some of it landed on earth and survived re-entry. That's what those organism fossils are that nasa was talking about, years ago, they're from a martian meteor.
Then, there are deep space comets that transfer material between solar systems.
The latest thinking is that the whole galaxy has been seeded in this way, and galaxies have exchange too over vaster time frames.
There's a reason why earth has certain organisms that can survive the vacume of space, radiation, and temp extremes -- they probably have ET origin.
If you don't believe me, just watch the new "Cosmos," I think that's where I saw all this.

I found it interesting -- I never realized the degree of exchange between planets. Especially in earlier development, the whole solar system was one big game of billiards with everything crashing into everything.
There are times in earth's history when ALL life was wiped out from impact, yet life came back again -- scientiests say that's because it got planted all over again by another meteor impact, or material returning back to earth that got ejected from the last extinction impact.
Anyhow -- the whole universe is "the natural world." I don't know why some of you guys are so hostile about it, like This is Earth -- this is Not Earth.
A planet is a darn planet, it's the same old sh*t man. Just a lot of variations. Mars used to have blue skies and oceans, too. Earth will lose its oceans and atmosphere one day, too, burned off by the sun. All of nature changes, nothing is permanent, and everything is in motion. Planets orbit the sun, and the sun is orbiting that big black hole in the middle of this spiral galaxy we're in. The galaxies are in motion, too, and collide and merge and rip each other up. Stars have cycles, when they go nova they spread out material for a new nebula and it all starts all over again.
I'm just saying it's a big kettle of stew here, it's the whole solar system and beyond, it's not like "nature" is just earth, it's a larger system than that.
There are probably 4-8 billion Earth type planets in the milky way galaxy:
$this->bbcode_second_pass_quote('', '8').8 billion habitable Earth-size planets exist in Milky Way alone
http://www.nbcnews.com/science/space/8-8-billion-habitable-earth-size-planets-exist-milky-way-f8C11529186 Why the hostility about space exploration? I really don't get it. It's like someone yelling at Jacques Cousteau to not dare dive under the ocean, because "we haven't saved the land yet."
This is just what humanity does, when the habitat is full then people emigrate out to somewhere that doesn't have any people yet. That's actually good for the original habitate, it relieves the over population pressure.