Forget green: Purple may be key to finding planets capable of hosting alien life, study says
To observers from outer space, Earth's vast oceans and verdant ... or no visible light and oxygen could retain a purple hue. ...
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Marvel at These Stunning Northern Lights Photos From Aurora Watchers
This serene scene shows a green and purple aurora reflecting in water ... inspiring views of the aurora came from the International Space Station. NASA astronaut Don Pettit shared a snapshot ...