SOLAR SYSTEM

Detailed explanation-1: -The star lies along the line of sight to the nearby Hyades cluster. Aldebaran is a red giant, meaning that it is cooler than the Sun with a surface temperature of 3, 900 K, but its radius is about 44 times the Sun’s, so it is over 400 times as luminous.

Detailed explanation-2: -Stars that have a low temperature and a low luminosity are typically small, cool stars known as red dwarfs. These stars are the most common type of star in the universe, but they are also the least luminous and difficult to observe.

Detailed explanation-3: -These are the supergiants, the largest of stars with extremely high luminosities. A red supergiant such as Betelgeuse would extend beyond the orbit of Jupiter if it replaced the Sun in our solar system.

Detailed explanation-4: -red gi·ant • n. Astron. a very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.