The new theory with time travel is that time exists in different planes, which coexist but have no effect on each other, so you could technically go back in time and kill yourself without repurcussions. Also, human time travel is certainly possible, but no where close to being realized. Time travel has already been proven on the quantum level
Oh and about the heavenly body thing...an asteroid is supposed to hit the earth in 2050-something. Theres an article about it in this months popular science
Oh and about the heavenly body thing...an asteroid is supposed to hit the earth in 2050-something. Theres an article about it in this months popular science