If the sun is not a Rigel why other scientist said that sun is the biggest star on the solar system and why if you look in the sky at night you never see a star more bigger than sun?

Answer 1

The Sun is a star, Rigel is also a star. We name the stars just like we name the planets.

Our solar system consists of The Sun and all the planets that go around it including moons, asteroids and comets. To say that The Sun is the biggest star in our solar system simply doesn't make sense because it is the only star in it.

Now, our solar system is inside a galaxy where there are approximately 200 BILLION stars, some are bigger some are smaller than The Sun. The closest star to us after The Sun, is so far away that it is impractical to measure distances in miles, so we have to measure distances in light-years (one light-year is the distance light would travel in one year, light travels at 18600 miles per second, therefore, one light-year equals 5,865,696,000,000 miles). The closest visible star to our solar system is about 4.3 light-years away and that is far enough to make it seem like a little dot of light to the naked eye despite it being about the same size as The Sun.

Answer 2

The Sun is a star, but it is not the biggest star in the universe. It is an average-sized star compared to others. The reason the Sun appears bigger and brighter than other stars in our sky is that it is much closer to us. Stars like Betelgeuse and Rigel are much larger than the Sun, but they are too far away to appear as large in the night sky.