I love how in this chapter both sides actually perfectly ready to hold their sides of agreement. Nobita is a given since he is weaker but Giant and Suneo upholding it is something admirable.
Nobita of all people should be someone believe alien exist since he already interact with plenty of them at this point but hey~ at least he get to be ballsy for once.
One of my favourite chapters as a kid, who woudn't want their own mini Mars lander? Also the inspiration for this chapter was during the Viking 2 lander mission to Mars in 1976.