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The Sun
By far the hottest object in the Solar System, the Sun is our main heating system. The reason why the sun's color is different when you see it with the unaided eye than when you see it with a telescope equipped with a Solar Filter is because we cannot see the actual surface of the sun, though the very outer edge of what is called the Corona is visible only during a Total Solar Eclipse. The sun, like the planets, orbits an object, which is called the Milky Way and rotates once every 25.4 days.
The temperature on the sun is roughly 10,000 degres Fahrenheit and it has a diameter of about 800,000 miles, which is bigger than any of the plants put together with  room left over. The components of the sun are 70% Hydrogen and 28% Helium with metals taking up the last 2%. The sun is 150 times more dense than water. Located on the sun's surface are dark spots known as sunspots, which are cooled areas of the sun. Of course, the sun won't last forever as with everything else, it will die but not right away as for about 5 billion years, the sun will continue to heat the Earth.