Star closest to Earth
- The Sun is one out of billions of stars.
- It rotates once every 27 days.
- The Sun formed over four and a half billion years ago. It is middle-aged. i.e it is at about the middle of its life.
- Sun’s surface is called the photosphere.
- A small region known as the chromosphere lies above the photosphere.
- The Sun is 109 times wider than Earth, and is 333,000 times heavier.
- Sun gives heat and light necessary for life support on Earth and hence without the Sun, life on Earth could not survive.
- Sun contains more than 99.8% of the total mass of the Solar System.
- The solar wind and the much higher energy particles ejected by solar flares can have dramatic effects on the Earth ranging from power line surges to radio interference to the beautiful aurora borealis.
- Its core temperature is 15 million º C.
- Sun has 75% Hydrogen and 25% Helium.
- Sun contains more than 99.8% of the total mass of the Solar System. Jupiter contains most of the rest.
- Ulysses was the first spacecraft to study our Sun's poles
- The Greeks named the Sun as Helios.
- All planets orbit the sun in the same direction, counterclockwise, and on roughly the same plane, known as the ecliptic.