Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

It is the closest ... little planet around it. Now three more have been discovered and they are all tiny. Barnard’s Star is an old M dwarf star, much smaller and much cooler than our Sun.

Save guides, add subjects and pick up where you left off with your BBC account. From up here on the International Space Station I get a great view of Earth. Our planet is just the right distance ...

Inner planets are the four planets closest to the Sun: Mercury, Venus, Earth and Mars. They are collectively characterized by a solid surface and small size relative to the outer gas giants.

For example, Mercury, the closest planet to the Sun, experiences a dramatic 46% temperature swing between its Perihelion and Aphelion Day! On its Perihelion Day, Mercury is only 46 million km from ...