The first observatory-class space-based solar mission from India.
Our Sun is the nearest star and the largest object in the solar system. The estimated age of sun is about 4.5 billion years. It is a hot glowing ball of hydrogen and helium gases. The distance to the sun from the earth is about 150 million kilometres, and is the source of energy for our solar system. Without the solar energy the life on earth, as we know, can not exist.
The gravity of the sun holds all the objects of the solar system together. At the central region of the sun, known as ‘core, the temperature can reach as high as 15 million degree Celsius. At this temperature, a process called nuclear fusion takes place in the core which powers the sun. The visible surface of the sun known as photosphere is relatively cool and has temperature of about 5,500°C.