<Tr> <Td> <Ul> <Li> by orbit </Li> <Li> by size </Li> <Li> by discovery date </Li> </Ul> </Td> </Tr> <Ul> <Li> by orbit </Li> <Li> by size </Li> <Li> by discovery date </Li> </Ul> <Li> by discovery date </Li> <Tr> <Th> Lists </Th> </Tr>

8 planets in the solar system in order