We are 
Quite often you ask us for more complex and stimulating questions. So we thought we’d make this one a little tricky. 
#ArianeFacts #Ariane5pic.twitter.com/W0fIYEdWOO
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More precisely, it’s the Delta-v formula used to calculate a Hohmann transfer. We hope you had sun with this quite tough question. Feel free to give us more explanations in our replies! #ArianeFacts #Ariane5pic.twitter.com/n8o8EXIyS3
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Ow yes I was right
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Well done, Arno!
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:/ je l’avais pas dutout
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Ne vous en faites pas Tom, la prochaine pourra être résolue avec wikipedia.
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Well done, Ruby!
We had no doubt you'd get it.
End of conversation
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