the astronomers use Absolute magnitude
microlensing
Astronomers study the movement of stars in the night sky using telescopes and specialized instruments to track their positions and trajectories over time. By observing and analyzing the patterns of star movements, astronomers can gain insights into the dynamics of the universe and the behavior of celestial objects.
Collectively they are called Astronomers and Astrophysicists. Either professionals or amateurs.There are many types of astronomers, defined by how they study the stars. The most well-known are those that use optical telescopes followed closely by those that use Radio-telescope to pick up wavelengths other than visible light. there are many others and many other ways to collect data on the galaxies and stars.Astrophysicists are astronomers and may also collect direct data, yet they are more interested in the working behind the data. They deal in physics and theories of the galaxies.
500 different ways
Stars are useful to us in several ways. They provide us with light and heat, they serve as navigational aids for sailors and travelers, and they also help astronomers study the universe and understand the origins of the cosmos. Additionally, stars play a crucial role in the formation of elements that make up our bodies and the world around us.
Astronomers can use an H-R (Hertzsprung-Russell) diagram to classify stars based on their luminosity and temperature, aiding in understanding star formation and evolution. They can also use the H-R diagram to identify different stages of a star's life cycle, such as main sequence, red giant, and white dwarf phases.
Electromagnetic radiation is "light." Light in various wavelengths (gamma rays through to infrared) comes to us from out in space, and astronomers use instruments called telescopes to capture it and observe the bodies and processes emitting this light.
because sometimes people study the moon in other different ways.
There are several ways to do this; the most accurate, as far as I know, is in the case of double stars. In that case, from the orbit of one of the stars, the mass of the other one can be determined quite accurately.
Astronomy is the overall title for a variety of sciences that involve the study of space and that outside of our planet. Some types of it as Astrophysics, Exobiology, Planetary or Exo Planetary astronomy, and Radio Astronomy just to name a few. Astronomy has many parts, such as planets, stars, black holes, star clusters, etc. They all have to do with space.
One of the newest satellites is the James Webb Space Telescope (JWST), launched in December 2021. It is an advanced space observatory that will help astronomers study the universe in ways never before possible, such as observing the first light from stars and galaxies.
People study abroad to learn about different cultures and ways of life. It is a life experience.