Do you think there are aliens?

[miotas]

With the incredible vastness of space, I think it's likely that aliens do exist. If there are advanced aliens, I think it would be amazing to meet them. I also think that anything is possible, including the possibility that aliens don't exist.

One would hope that such an advanced society would not resort to such ancient notions of conquest and subjugation. That seems to be a human trait.

Maybe an advanced alien society would be so advanced as to abhor war, but maybe by the same token they would be so advanced as to consider us insignificant. Removing a few humans to make way for themselves might be no more abhorrent to them than clearing a grassy hill to build a house is to humans.

Hibernation exists, yes. It works by the virtue of some organisms living off other organisms that happen to be around without any active doing of the other ones. Animals rely on plants or other animals to `magically' collect the energy all in one place so they can eat all of it quickly before the next hibernation. That works in a complex ecosystem such as the earth because there *are* other energy sources for the plants and prey animals to begin with, recursively, that are not exhausted quickly and replenish. Such ecosystems would (a) have to be understood in their entirety; (b) be possible to `carry around with you' in order for such a thing to work on a spaceship. So far our experiments with sustainable ecosystems have been mostly miserable failures which suggests (a) is a bit more complex than it might at first seem. So far our spaceships do not generally feature much room for passengers, let alone entire ecosystems, suggesting (b) might be a little tricky too: it's after all not just because it is cheaper to build small spacecraft that we keep the dimensions of capsules and rockets down.

Spin all you want it does not cause (additional) gravity to spring into existence. That's not how gravity works.

When discussing space travel, there is usually an assumption that this occurring in the future, when we have already figured such things out. Travelling around the globe would have been impossible to an ancient Egyptian, but only takes us a matter of days.

It's quite possible that as civilizations advance, they lose interest in space travel. Being an astronaut isn't as big a craze today as it was in the recent past is it? Who says we won't be content taking pictures?

Not necessarily, being a pilot no longer brings the rock star like adoration that it once did, but more people fly now than ever before.