Earth's atmosphere came from outer space, find scientists

[Swede]

Why not?


"We found a clear meteorite signature in volcanic gases," said Dr Greg Holland the project's lead scientist.

"From that we now know that the volcanic gases could not have contributed in any significant way to the Earth's atmosphere.

"Therefore the atmosphere and oceans must have come from somewhere else, possibly from a late bombardment of gas and water rich materials similar to comets.

http://www.physorg.com/news179676765.html

[lapfog_1]

1. Pretty much ALL of earth came from outer space.

That being the definition of "elsewhere" and you postulate a time when there was no "earth".

The better headline would say "Earth's atmosphere was a late arrival to our planet, probably from a late bombardment of comets."

Doesn't answer the question "How did comets form and get so much water and gases?"

[Warpy]

2. All heavy elements, including oxygen, nitrogen and carbon,

came from supermassive stars that went supernova. It all drifts as clouds of dust until it's scooped up by something bigger.

Everything that we are is the stuff of exploded stars.