sentences: the sun is a kind of star & the space revolves around the moon ->  the earth revolves around a star  the sun plant the space & earth is a kind of planet -> the moon orbits a planet the moon orbits a planet  the moon orbits a planet & revolving around young orbiting -> the moon revolves around a planet the moon revolves around a planet  the space revolves around a stripe & the moon revolves around a planet -> the difference between the earth and the moon is that the moon revolves around a planet