Faint Young Sun Paradox
There are two things.
This is called Faint Young Sun Paradox.
Why Earth avoided the deep freeze is a question that has puzzled scientists for so many years.
Recently, the researchers have given a new explanation to Faint Young Sun Paradox. They have recently put forward a theory that Earth would have to be 6 or 7 percent closer to the sun than it is now. It’s a few million miles, but from an orbital mechanics standpoint, it’s not that far. The question is what could make a planet move from one location to another?" Professor proposes that Earth may have migrated from the sun over time through a process called planet-planet scattering, which occurs when one planet or more is ejected from its orbit, an increase in orbital separation occurs, or when planets collide.