Usually light-years, or parsecs.
Distance.
With a long measuring tape.
Astronomers typically measure distances in parsecs. One parsec is the distance of a hypothetical star having a parallax of 1 second of arc; it's about 3.2 light years.
Astronomers use the parallax method to measure distances to stars by observing how a star's position shifts against distant background stars as Earth orbits around the Sun. By measuring the angle of this shift and knowing the baseline distance between Earth's orbit positions, astronomers can calculate a star's distance using trigonometry. The parallax method is most effective for nearby stars within a few hundred light-years from Earth.
To measure the distance of stars you have to measure by light years.
Astronomers use a method called parallax to measure the distance to nearby stars. By observing how a star's position changes when viewed from different points in Earth's orbit around the Sun, astronomers can calculate the star's distance based on the angle of this apparent shift.
Astronomers measure distances from Earth to stars using a method called parallax, which involves observing the apparent shift in a star's position as Earth orbits the Sun. They also use techniques like spectroscopy and standard candles to estimate distances to stars that are farther away.
Astronomers use parallax to measure the distance to other stars by observing how a star appears to shift its position against the background of more distant stars as the Earth orbits the Sun. By measuring this apparent shift, astronomers can calculate the distance to the star based on the angle of the shift and the known distance between the Earth and the Sun.
For small distances, e.g. Earth to Moon, scientists use miles of kilometers. For larger distances, e.g. the orbit diameter of Jupiter, they use the "AU" or Astronomical Unit, which is the distance from the Sun to Earth. For enormous distances, astronomers use the lightyear, which, although it sounds like a time unit, is truly a distance unit. A lightyear is the distance light travels in one year, or 5.87849981 × 1012 miles. Another unit for large distances is the Parsec, which is 3.26 lightyears.
Because it is a large number, suitable for large distances. Astronomers also like to use the unit Parsec.
Astronomers use the unit of measure "Light Years" to calculate the distance between pretty much anything in the Universe.
Astronomers measure the parallax angle of a planet or star to determine its distance from Earth. By observing the apparent shift in position of the object against the background stars as the Earth orbits the Sun, astronomers can calculate the angle and use it to estimate the object's distance.