Although the sun and the earth are separated by mercury and Venus, the sun can still transfer its light and heat to the earth to provide energy for life on earth. Therefore, the sun is very important for life on earth.

The sun is the parent of the solar system and the most important member of the solar system. Other members of the solar system orbit the sun orderly under the action of gravity. The sun constantly radiates heat into space every day, of which 1 / 22 billion of the energy radiates to the earth, becoming the main source of light and heat on the earth.

For mankind, the blazing sun is the most important celestial body in the universe. Everything grows on the sun. Without the sun, there would be no colorful life forms on the earth, and of course there would be no human beings. The sun brings light and warmth to human beings. At the same time, it makes the earth alternate between day and night and seasons, balances the earth's climate, and provides various forms of energy for life on earth.

The sun mainly uses its internal hydrogen as fuel. The sun will burn hotter and faster with the passage of time, which leads to the sun becoming brighter and brighter. The sun was born at least 4.6 billion years ago. From now on, the sun can still exist for about 7 billion years. After about 7 billion years, the core of the sun will heat up to a critical value, and it will expand to 260 times its current radius. At this time, due to the expansion of the sun's volume and surface area, its total luminosity will increase, and the surface temperature will decrease. However, because of its large volume, it will look dark.

The sun will gradually devour mercury, Venus, earth, and Mars as its volume increases. But because the gravitational force of the sun will decrease with its size, the earth may escape the fate of being swallowed up by fire. Even so, without the sun, the temperature of the earth's surface would be extremely low, and all life would no longer exist.