Space/Science — HabitableZone

Space/Science » in reply to I'm serious. What does it mean if it's green? Ø

Re: Take your pick:

Oxygen.

Perhaps a touch of magnesium

Could be Nickel

What’s ‘in’ our atmosphere may have something to do with it too:

http://www.windows.ucar.edu/spaceweather/basic_facts1.html

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