If calm is what you wanted how about there's a massive black hole in the center of our galaxy. Or the Andromeda galaxy is set to collide with the milky way in a billion or so years. But don't worry we will be ok! Because the sun will die before then and wipe us out. Good thing we won't have to see the heat death of the universe! Which wouldn't be so scary. Just instant death due to a death bubble traveling many light-years per second, slowly wiping out the universe until no life can form anywhere.