Sun-Earth Day, which is celebrated in March, was created by NASA and the European Space Agency (ESA) to spread facts about the Sun and its relation to life on Earth. Did you know the surface of the Sun, or its photosphere, is over 10,000 degrees Fahrenheit? That's relatively cool compared to its core's temperature which is a mind-boggling 27 million degrees Fahrenheit. Because of its size and mass, the sun's gravitational pull is 28 times greater than on Earth. Therefore a person weighing 150 pounds here will weigh 4,200 pounds on the Sun. However, exactly how does the Sun affect life on Earth? Plants need sunlight to undergo photosynthesis and produce oxygen for life on Earth.