The sun is the biggest star in the solar system and keeps all the planets warm and the closer you are the warmer you get and the further you are the colder. The sun is probably the most important planet in the whole universe if we didn't have it we would all be in an ice age and all die of coldness.

Sun Radius (km)696,000 Mass (kg) 2,000,000,000,000,000,000,000,000, 000,000 Volume (m³) 1,400,000,000,000,000,000,000,000, 000 Average density (kg/m³)1400 Surface gravity (m/s²)274 Rotation period (days)26 (at equator) Temperature at surface (C)~5700 Escape velocity at surface (km/hr)~2 million There is no population know to man on the sun. The sun is 4.5 million years old.

the sun of our solar system is a huge ball of hot, glowing gases. at about 333,000 times the mass of earth, the sun contains about 99.8 percent of all the mass in the solar system. heat and light from the average-size star travel a mean distance of million miles (149.6 million kilometres) to reach earth and support all life on our planet. We live on the planet, so we think it’s an equal member of the Solar System. But that couldn’t be further from the truth. The reality is that the mass of the Sun accounts for 99.8% of the mass of the Solar System. And most of that final 0.2% comes from Jupiter. So the mass of the Earth is a fraction of a fraction of the mass of the Solar System. Really, we barely exist.

It feels like the Sun has been around forever, unchanging, but that’s not true. The Sun is actually slowly heating up. It’s becoming 10% more luminous every billion years. In fact, within just a billion years, the heat from the Sun will be so intense that liquid water won’t exist on the surface of the Earth. Life on Earth as we know it will be gone forever. Bacteria might still live on underground, but the surface of the planet will be scorched and uninhabited. The most famous spacecraft sent to observe the Sun is the Solar and Hemispheric Observatory, built by NASA and ESA, and launched in December, SOHO has been continuously observing the Sun since then, and sent back countless images. With a diameter of 109 times the size the Earth, the Sun makes a really big sphere. You could fit 1.3 million Earths inside the Sun. Or you could flatten out 11,990 Earths to cover the surface of the Sun.

The Sun is one out of billions of stars. The Sun is the closest star to Earth. The Sun rotates once every 27 days. The Sun is now a middle-aged star, meaning it is at about the middle of its life. The Sun formed over four and a half billion years ago. You may think the Sun will die soon, but it will keep shining for at least another five billion years. The Sun’s surface is called the photosphere. The temperature of the photosphere is about 10,000  Fahrenheit. Its core is under its atmosphere. The temperature at the core, or very middle, of the Sun, is about 27 million  Fahrenheit. That’s pretty hot! The Sun’s diameter is about 870,000 miles wide. That means if you put the Sun on a scale, you would need 333,000 objects that weigh as much as the Earth on the other side to make it balance.

The Sun is only one of over 100 billion stars. In ancient times, the people believed the Sun was a burning ball of fire created by the gods. Later, people thought it was a solid object, or a liquid ball. Over one million Earths could fit inside the Sun. Looking directly at the Sun can permanently damage your eyes because it is so bright. A star mostly gives off light and heat. The larger the star, the hotter its temperature. A supergiant star can get to be 400 times larger than our Sun, which is almost a million miles in diameter. The Sun is tilted.

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