Astronomers
Anything outside the Earth is astronomy.
the Greeks called the planets wanderers
Using the stars (and planets) to predict future events on Earth is called Astrology. There aren't many who would still call it a "science," though.
rockmantoligost
An object that orbits a star is called a "planet." Planets can vary in size, composition, and atmosphere, and they are typically categorized as rocky or gas giant planets. Other celestial objects that may orbit stars include dwarf planets, moons, and asteroids.
Anything outside the Earth is astronomy.
You don't.
exoplanets
A huge mass of stars and planets is called a galaxy.
An astronomer.
Technically yes. A long time ago, when people didn't know about planets, they called the ones that moved differently than the rest, wandering stars. That's where the word planet came from. So, in that sense, even though planets are not stars, it is accurate to call them that due to their history.
telescope
Planets orbit stars. Our planet (earth) orbits a star we call the sun.
This will never happen.
An astronomer
Comparative Planetology
Those are called "planets". The ancient Greeks distinguished "fixed stars" - which is what we nowadays simply call "stars"; and the moving stars, which in Greek is called "planets".A planet certainly looks like a star (a very bright star, in some cases), but nowadays they are not usually called "stars".