What bothers me is I often read they are using the planet's gravity to gain speed. Whatever speed an objet may gain while entering orbit should be lost when exiting it, right ? So I guess it's the cinetic energy of the planet that is actually fuelling the spacecraft, isn't it ?
mr_azerty
joined 2 years ago
On notera que les voyageurs doivent se répartir pour garantir l’équilibre du « wagon» , mais à Lyon, comme le montre le succès des ZFE actuelles, on est très social.
Ça c'était gratuit.
On the other hand, people just charge at home 90% of the time.