What if, 65 million years ago, the asteroid didn't hit Earth and the dinosaur extinction didn't happen?
How would the earth have evolved if the asteroid didn't hit the earth and kill the dinosaurs?
Could an asteroid hit knock Earth off its orbit? If a massive asteroid hit earth, would it be more catastrophic if it hit land or open ocean? Could an asteroid impact knock the Moon into the Earth? Why don't the asteroids in the asteroid belt coalesce to form a planet? Would we be better off if an asteroid hit land or water? What if we weren't the original people of earth and we killed off a race to have earth? How fast would a 10km wide asteroid need to be travelling to destroy all the dinosaurs on earth? What would happen if earth didn't have a moon? Will gravity eventually pull the asteroid belt together to form a planet? What would happen if earth was a moon of jupiter? If the Moon weren't orbiting the Earth, would it be considered a planet? What would happen if the Moon hit the Earth? What would happen on earth if a meteor hit the moon? How will the earth die? If extra terrestrials attacked the Earth would humans stand a chance of repelling them? If I built a death star over say Tatooine, then decided I wanted to destroy Earth, would I have to make the death star mobile? Or would it be possible (assuming I could collect enough energy) to target and destroy Earth, unobstructed by innocent objects along the way? What would happen to Earth if the Moon is hit by an asteroid, forcing it to have a different orbit around the Earth, but at the same distance? What could possibly end the world except killer asteroids? If wiping out human existence would save planet earth, and not doing so would lead to its complete destruction, should we do it? If we detected a planet-killing asteroid, is there anything we could do about it at the present time? Why didn't any of the other planets in the Solar System evolve the conditions for life as we know it, given that they were created by the same process? If a rogue planet the size of Mars were to hit the Earth in 3 years, how would nations respond? If life were to start in an Earth-like planet somewhere in the universe, what is the possibility that it will evolve exactly like in Earth? What would happen if  the Earth and all terrestrial objects suddenly  stopped spinning, but the atmosphere retained its velocity? If the early Earth’s atmosphere was deteriorating to a certain extent and was hit by a solar storm, could it create the first life? What would happen if you were to jump into the planet Jupiter? What could end the world except asteroids? What would happen to Venus if it were moved to an orbit half way between mars and Earth? What would happen if the moon fell to earth? What would happen to Venus if it was moved to an orbit half way between Mars and Earth?