"Science is not perfect, it is often misused, it is just a tool, but it is the best tool we have, it corrects itself, it is always evolving and it can be applied to everything. With this tool we conquer the impossible "
Carl Sagan
Including the planets and their satellites, comets and meteoroids, stars and interstellar matter, systems of dark matter, stars, gas, and dust called galaxies, and galaxy clusters ;!
A galaxy (from the Greek γαλαξίας 'milk') is a set of stars, gas clouds, planets, cosmic dust, dark matter and energy gravitationally bound in a more or less defined structure.
It is one of the most renowned space telescopes in modern astronomy that orbits outside the Earth's atmosphere, in a circular orbit around planet Earth at 593 kilometers above sea level, with an orbital period between 96 and 97 minutes.!