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.
Are there planets that are not composed of rock, like Mercury, Venus, Earth and Mars? Are there planets where there is no land, just all nothingness? Yes, there are, they are known as a Gas Giants, they are large celestial bodies that are instead made up of gases. They may have a solid core, and their storm-laden atmosphere is very thick. They are all so large they could fit ten Earths. Solar Systemâs outer planets Jupiter, Saturn, Uranus and Neptune are all gas giants. Jupiter and Saturn are composed mainly of molecular hydrogen, metallic hydrogen and helium.