A lymphocyte is a type of white blood cell. White blood cells are part of your immune system and help your body fight off diseases, including infections and cancer. There are two main types of lymphocytes â B cells and T cells.
There are the inner, rocky planets and then the outer gas planets. Venus is a rocky planet, as are Mercury, Earth and Mars. The terrestrial (rocky) planets are the 4 inner (closest to the sun behind the asteroid belt) rocky worlds in the Solar System: Mercury, Venus, Earth and Mars. The Gas giants, well, they are Jupiter, Saturn, Uranus, and Neptune. The gas and rocky planets are separated by the asteroid belt.
Jupiter and Saturn are the gas giants of the Solar System. The term gas giant was originally synonymous with giant planet, but in the 1990s it became known that Uranus and Neptune are really a distinct class of giant planet, being composed mainly of heavier volatile substances (which are referred to as ices).