Life On Mars.

To have a living population on Mars, we would need to get food and shelter. I don't think it's possible because the weather conditions become very extreme and the atmosphere is 100 times less dense than Earth.

If the sun stopped.

If the sun suddenly stopped burning I think our Earth would not be able to function, we need sunlight for most things. First animals would be dying since the sunlight helps plants grow, and the herbivores would have no food, they would die off then the carnivores would have no food. People wouldn't be able to live, since there food source died off, and since there is no sun, there would be no heat so it would be to cold to live.

What I would be

I think if given the choice I'd pick astronomy. The stars and space are some things I find interesting.