This right here:

https://www.space.com/36800-five-ways-to-die-on-mars.html

It's scary because of how many people want to give it a go anyway.

False vacuum decay fucks me up due to the idea that it could happen at any point at any moment.

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Could already be happening? I could be totally misremembering but doesn’t it still progress at the speed of causality??? Though if so that would mean it might never catch up to some of the expansion? On the other hand … some theorise that we are already in a process of false vacuum decay - that’s what cosmic inflation is?

We must colonize other planets if we want our species to survive as long as possible

Given how long the universe is expected to exist, and taking that into consideration with how long it has already been about. We are so, so, SO early to the party.

Maybe life in the universe IS abundant, but we just haven't caught up to when it is on the timeline.

The "Grabby" Aliens hypothesis is cool too!

The coolest would be that some stars can have temperature of "barely lukewarm". I know they're brown dwarfs but that counts as stars. And WISE 0855-0714 is not even lukewarm, it's below water freezing point! Makes you really think about... well, what temperature is (anything above 0K). If that's not cool, idk what.

As for the scariest... well, when I was a kid I was afraid about the Sun dying. My tiny brain couldn't comprehend that I won't live for 5 billion years anyway. Used to have nightmares about the Sun frying the Earth. Now it's gamma ray bursts, I suppose. My brain is only slightly bigger now and it cannot understand probabilities and chances well.

I was listening to a podcast a while ago where they were laughing with a guy who (I think) had basically got a Nobel prize or some such for as they put it expanding our ignorance by working out that we actually only really know what 5% of the universe is - because dark matter/ dark energy makes around 95%.