I would need to see the spaceship in space, using a telescope with my own eyes. Or at the very least someone credible pointing it out, like NASA, JAXA or ESA (p

I would need to see the spaceship in space, using a telescope with my own eyes. Or at the very least someone credible pointing it out, like NASA, JAXA or ESA (preferrably all of them). Also an explanation of how the civilization managed to be unseen, or how are they traveling FTL.