Why the UFO was green

Following an online chat with astronomer friend, Michael Tweedy, we think we have solved the green colour of this satellite. The second stage rocket that manoeuvred the satellite into orbit used liquid oxygen and hydrogen as fuel. A by-product of this is excited oxygen atoms that glow green in the atmosphere as they return to their normal sate. It’s the same principle as the Northern Lights so our little satellite was putting on its own aurora! I love science!

 

 

 

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