When is the Sun and Earth going to collide?
Nobody knows for sure but I think it would be along time like some millions or billions years. Anyway you don't have to worry about that for now. ___________________________ At a close approximation, "never" . In about 5 billion years, the Sun will turn into a red giant star, and _may_ expand enough to consume the Earth. But the math isn't certain yet.
We do not believe that the Earth will ever collide with the Sun; however, in about 4 billion years, the Sun will probably expand into a red giant, and expand out to consume the planets Mercury and Venus, and perhaps Earth as well. By that time, we will may be able to move the Earth out from the Sun. Science fiction author Larry Niven proposed a mechanism by which it might be done in his…
In most probability the earth would never have come into existence without the sun. However, if the sun had to disappear now, all life on earth would die very shortly, as everything on earth requiring it's energy would die. Everything that orbits the sun will go off track and possibly collide as there will be no gravitational pull from the sun.