Milky Way Star Births May Have Influenced Life

eldavojohn writes "Space.com has an interesting article that speculates that the period when our galaxy was giving birth to stars resulted in huge fluctuations and impact on earth. From the article, 'Some 2.4 billion years ago when the Milky Way started upping its star production, cosmic rays — high-speed atomic particles — started pouring onto our planet, causing instability within the living. Populations of bacteria and algae repeatedly soared and crashed in the oceans.' Causes one to wonder what the probability for life arising on a planet is given that our own seemed to be in a very unique situation on many different counts."

Comments

Probability theory

[PhotoJim]

Even if the chances were one in a billion or one in a trillion, the sheer number of stars and planetary systems in the galaxy (and indeed the universe) make it entirely unlikely that there *isn't* life out there somewhere. Humans seem to want to be perceived as being special on both an individual and a collective level. We don't really want to accept being common or normal or average. There is life out there somewhere. We'll never find it because of the distances involved, but I am convinced it's there. I think we beat huge odds to get here, but there are still huge numbers of other civilizations that beat similar odds.

Re:Probability theory

[Shakrai]

Most people will agree that humans are still special even if we find an advanced civilization outside our solar system. However, the majority of Christians (and other religions) believe we were placed here by a supreme being in his likeness and the whole universe is ours and ours alone. The idea of another race of beings on another planet would basically shatter the definition of life created by the church.

I think that most Christians (and other religions) could accept the concept of life beyond Earth without having their faith completely shattered. Hell, the Catholic Church is more or less accepting of evolution as a concept (though "guided" by God as they say). The Fundies might have a problem with it, but then, what don't they have a problem with?

A long time ago

[franksands]

2.4 billion years ago, cosmic rays travelled through space to create this first post.

Not too much different from other changes

[Josh Lindenmuth]

In general, any period of time where there is massive stress on a population would likely see rapid evolutionary changes. Whether it's volcanos, or asteroids hitting the planets, an ice age, or interstellar radiation, the effect is basically the same - an initial decimation of existing populations with amazing biodiversification thereafter.

100 Billion

[Gotung]

To borrow a theme from Carl Sagan.
Estimations are that there are 100 Billion stars in our galaxy. Thats:

100,000,000,000 -- Let's say 1 in ten of those are in a good region of the galaxy (not a bunch of cataclysmic crap going on)
Thats: 10,000,000,000 -- Let's say 1 in ten of those have planets.
Thats: 1,000,000,000 -- Let's say 1 in ten of those have a planet in the stars habitable zone
Thats: 100,000,000 -- Lets say 1 in ten of those have adequate amounts of water
Thats: 10,000,000 -- Lets say on 1 in ten of those simple life arises.
Thats: 1,000,000 -- Lets say on 1 in ten of those complex life develops.
Thats: 100,000 -- Lets say on 1 in ten of those intelligent life develops.
Thats: 10,000 -- Lets say on 1 in ten of those advanced civilization pops up.
Thats: 1000

10,000,000 planets that foster life, and 1000 advanced civilizations.

I think the chances are pretty good. :P