because it is a planet
None of the planets are stars, only the stars. See related questions.
Galaxies are generally a collection of stars. But within any galaxy, there are lots of other objects, including planets. So galaxies are related to planets in some ways.
No, planets are not stars. Stars are huge balls of burning gas, planets are not. At certain times, there are 5 planets that are visible with the naked eye in the night sky. Some of these are similar to stars but much closer. They are Mercury, Venus, Mars, Jupiter and Saturn. See the related link for more information.
Planets orbit stars.
On the contrary! A star has planets, which circulate it. And planets have moons. Stars do not circle planets.
No. Supernovas are cataclysmic eruptions from massive stars that have come to the end of their lives. See related questions
Stars The 2006 German poster is in the "Related Links" section
Polaris is a star. It is likely that it has planets, i.e. that there is a related solar system, since most stars seem to have planets.
Planets and stars have gravity.
The Solar System Makes the planets and the Stars.
No. Geography is the study of Earth, covering landscapes and environments among others. Astronomy is the study of planets.
Moons orbit planets. Planets orbit stars. Some stars orbit other stars, or orbit their mutual center of gravity. Stars orbit the center of the galaxy. Galaxies may orbit the center of the "galactic group".