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.Know More
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 about Our Sun
The star that shares the solar system with the Earth is the Sun. It is the star around which all the planets in the system revolve. According to About.com, the Sun weighs almost 99.86 percent of the total mass in the solar system.Full Answer >
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 >
The sun formed from a collection of gas and dust that pulled together by mass gravitation; the extreme pressure caused by this great mass produced a nuclear fission reaction that fueled the sun and continues to keeps it burning. The primary elements that make up the sun are hydrogen and helium. Scientists theorize that the shock wave from a large supernova drew together the dust particles that became the sun.Full Answer >
Ultraviolet radiation from the sun is the primary cause of skin cancer, according to WebMD. Sun exposure also accelerates the age of the skin. Dr. Troy L. Bedinghaus notes that sun exposure may result in damage to the eyes.Full Answer >