why do we exist? can we live on mars? can we see Oxygen? Can lightning strike on a plane?

Evolution

Yes, with a bit of work

No, it is transparent and odourless

Yes, but the plane has a Faraday Cage effect

We exist because we were created

We exist because everything in the universe that exist must change and we happen to be one form of it.

We could with the correct equipment live on Mars or we could nuke it and wait for the atmosphere to build and then turn it into our home. That would take decades though. We can't see oxygen. But we can detect it.

Lightning does strike planes. It's dangerous. But one of the main things you can't prepare for.

Why do we exist?

No particular reason. We exist because evolution created us. Conditions favored us.

can we live on mars?

No. But if we take earth-like conditions there (in a closed sealed habitat, we can live in that habitat.

can we see Oxygen?

No. Oxygen is a colorless gas

Can lightning strike on a plane?

Yes. It often does. But usually does not affect the operation of the aircraft.

see this web article

http://time.com/4910412/plane-struck-lightning-saf...

Why do we exist? Continuation of the species

can we live on mars? Not in your birthday suit

can we see Oxygen? If it was a liquid or solid, yes

Can lightning strike on a plane? All the time.

1) So that you can ask that question.

2) With proper equipment, yes.

3) Only when it's frozen, or liquid.

4) Yes.

We don't know and maybe there isn't really a why.

Yes, but you need to bring a bit (actually, a LOT) of Earth's environment with you.

Yes. When liquefied, it is a pale blue fluid.

Yes, and that happens regularly; so regularly in fact that lighting protection demonstration is part of any aircraft certification process.