Within the Solar System, four Jovian planets exist – Jupiter, Saturn, Uranus and Neptune. A planet designated as Jovian is hence a gas giant, composed primarily of hydrogen and helium gas with varying degrees of heavier elements.This planets are also known as Gaseous planets.

With the exception of Pluto, planets in our solar system are classified as either terrestrial (Earth-like) or Jovian (Jupiter-like) planets. Terrestrial planets include Mercury, Venus, Earth, and Mars. These planets are relatively small in size and in mass.This planets are also known as Rocky planets.

The visible surface of the Sun, the photosphere, is the layer below which the Sun becomes opaque to visible light.Above the photosphere visible sunlight is free to propagate into space.