Posts tagged theories
By all accounts Earth should be a “snowball planet” like the frigid world Hoth in the 1980 Star Wars film “The Empire Strikes Back.”
Why? Because common theories of stellar evolution predict that the sun was only 70 percent of its current brightness when it first lit its fusion engine 4.5 billion years ago. The sun has been steadily growing brighter since then and will continue so into the future, eventually evaporating away Earth’s oceans.