Question

explain briefly about sun

Answer 1

The Sun, like most stars in the Universe, is on the main sequencestage of its life, during which nuclear fusion reactions in its core fuse hydrogen into helium. ... For the Sun, this process began 4.57 billion years ago, and it has been generating energy this way every since.

Answer 2

The Sun is a star, just like the ones you can see in the night sky, but much, much, much closer. In fact, our Sun is a rather ordinary star – it's not particularly big or particularly small, it's not particularly young or particularly old. Just an ordinary, run-of-the-mill star. However, since it is so close to Earth, it is the one star that we can mostly easily study. From it we have learned a great deal about the physical processes that determine the structure and evolution of stars in general.The Sun contains the same basic elements that we find on Earth, but in vastly different quantities than what we see around us. The Sun contains about 92% hydrogen and 8% helium, with just a tiny bit of the other common elements we find on Earth. Compare that to Earth, where the most common elements are oxygen, magnesium, silicon, and iron. On Earth, hydrogen barely makes the top 10 list of common elements, and helium is extremely rare.

The parts of the Sun that we can observe and measure directly are contained in the Sun's atmosphere: the photosphere, chromosphere and corona. These regions have substantially different properties from each other, with regions of gradual transition between them.