The Sun is the most important object in the Solar System. The planets, asteroids, and comets all are held in their orbits by its strong gravity. Without the Sun, the Earth would be a dark, dead, frozen world.
Sunlight warms our planet, powering the weather systems.
Even a small change could make life on Earth difficult. A minor increase in the Sun's heat would start the melting of the polar ice-caps, with the disastrous result of a rise in the ocean levels. On the other hand, if the Sun cooled a bit, a new ice age would begin on Earth. A speck of solar material just the size of a grain of sand, taken from the Sun's core, could burn a human being from 150km away. The Sun's mass is about 333,000 times that of the Earth.