Why is the universe, of which our earth is a part, so frightening ? give as many reasons as you can

Just as you "step" outside of our Earths ozone layer everything there it will kill you if not for the special suits! Radiation, space vaccum, pressure, temperature, etc is not human species friendly! That's why we need The ozone layer, without which we would not survive more than a few days on this planet!

Increasing the release of greenhouse gases and pollution

A,b,c is the answer to the question