Astronomers utilize a variety of techniques to determine the distances between stars dependent on their brightness, size, and motion, as well as other features. The most popular methods include the following: n Parallax: This technique is based upon the evident shift of the position of a star near distant stars when the Earth revolves around the Sun. By taking the angle of this shift, Astronomers can determine the distance from the Star using trigonometry. n The brightness of a Stellar: This technique uses its intrinsic luminosity, also known as the luminosity of a star, and its apparent brightness or magnitude, as observed from Earth, to calculate the distance it is. Comparing the luminosity of specific types of stars, including Cepheid variables, and their magnitudes as observed and astronomers can estimate their distances. n Traditional candles: This method uses the luminosity of astronomical objects, such as Type Ia supernovae, to determine the distance between galaxies and galaxies in clusters. By taking the apparent luminosity of these objects, scientists can calculate their distances using their luminosity, as well as the square law of light that is inverse. n Radar range: This method makes use of radar signals that are sent from Earth to other asteroids or planets and returned to Earth to calculate their distances. In determining the delay between the receiving and sending signals, astronomers can calculate the distance from the object. n