That is a telescope
A spectrometer is used to determine the composition of stars, and how fast they are going relative to Earth.
Usually during the night.
A telescope is commonly used to see stars and planets clearly in the night sky. Telescopes work by gathering and focusing light to magnify distant objects, allowing observers to see them more clearly and in greater detail. Telescopes come in different types and sizes, suitable for various astronomical observations.
Planets orbit stars.
Telescope
On the contrary! A star has planets, which circulate it. And planets have moons. Stars do not circle planets.
Planets and stars have gravity.
The Solar System Makes the planets and the Stars.
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".
No. Stars are like suns, around which planets may orbit.
Astronomers (and their ilk) study stars and planets.
Planets orbit the sun. Stars do not.