Humans, animals and plants on Earth need the sun because it provides most of the energy required to survive in this solar system. Earth would be a very cold and lifeless planet if it did not get its light and heat from the sun. Similarly, the Earth's stays in orbit because of the gravitational pull of the sun.
Plants also need the sun's energy for the photosynthesis process used to manufacture food and oxygen. While a plant is an autotroph that make its own nutrients, animals and humans are heterotrophs that depend on autotrophs or other heterotrophs for food. Without food and oxygen animals and humans could not live on Earth.
Humans also need sunlight to manufacture vitamin D. This vitamin is necessary for the absorption of calcium that is important for strong bones and overall health.Learn More
The Sun is a star that comprises 99.8 percent of the total mass of the solar system, and it is made up of 92.1 percent hydrogen and 7.8 percent helium. It is almost a perfect sphere with a diameter of approximately 864,336 miles, which is more than 100 times that of the Earth.Full Answer >
Earth is the third planet in the solar system. Earth orbits the sun at a distance of roughly 93 million miles and is the only known planet capable of supporting life.Full Answer >
Because the sun is not a planet, a solar day is undefined. The definition of a solar day is the amount of time it takes for a planet to rotate on its axis before the sun returns to the same spot in the sky.Full Answer >
A granule is a cellular feature found on the surface of the sun that is caused by convection currents. Granules are situated atop convection cells, except in areas enveloped by sunspots, that release hot fluid from their interior. This process creates bright spots on the surface that sink inward.Full Answer >