How big is the universe?

The dimensions of the universe depend on its age, shape, total mass and acceleration. The correct estimation of the size is around 156 billion light years. Much confidence can be put into this value as the instrument that has been used to measure is the […]

Why is the sun yellow?

Sun is made up of gases mainly like hydrogen, helium and small amount of other elements like sulphur, magnesium, carbon, neon, iron, oxygen, nickel, chromium and calcium. Temperature on the surface of sun is approximately 5780K, giving the sun white color but it often appears […]