Because we had to go there for the Rosetta scientific objectives very far away -- four times the distance of the Earth to the sun -- and also at a much higher velocity than we could achieve with fuel, because we'd have to take six times as much fuel as the whole spacecraft weighed.
Zbog Rosettine znanstvene svrhe, morali smo otići jako daleko, na udaljenost četiri puta veću od one između Zemlje i Sunca, i pri puno većoj brzini nego što bismo je mogli postići uz gorivo jer bi nam trebalo šest puta više goriva nego što teži cijela letjelica.