What is a solar radius?
The solar radius is one of the ways that astronomers use to classify stars in the galaxy of the Milky Way, and is the basic unit of size based on the radius of the Earth's sun or distance from its center to outer surface. At approximately 432,164 miles (695 501 kilometers) in the radius, the sun is an average yellow star in the so -called main sequence in the Milky Way galaxy, which contains a stunning volume of all stars. While Star Evolution dictates that most stars spend 90% of their lives in the main sequential range of stars, there are also a small number of neutron stars that can be up to 12 miles (Appx 19 kilometers) into a radius, converting to 0.00003 solar radii. In the Milky Railway since 2011, the largest star Red Hypergier is called Vy Canis Mairis, which is larger than the Sun about 1,950 times. By replacing the Sun for Canis Majorris in the Earth's solar system, it would have such a huge solar radius that it would include a region of space reaching the planet SAT planetUrn.
Most of the main sequence stars with a sun radius near the sun exists in the area of the Milky Way disk, unlike its strongly focused central bulge stars. The main sequential stars range from the small red dwarves to yellow stars like the sun, and blue giants. Red dwarves are usually half the size of the sun or smaller and are the most common type of star in the milk galaxy. The closest neighbor of the Alpha Centauri solar system is a double star in a locked orbit with proxima Centauri, a red dwarf, and Alpha Centauri has a solar radius of 1,227, so it is slightly larger than the sun. Blue giant stars are the upper end of the stars in the main sequence and are 10 to 100 solar radii.
stars located in the external disk areas of the Milky Way are referred to as populations and stars and are a relatively relatively young, with high concentrations of heavier firstKinks like iron. The sun is about 25,000 light -years since the center of the galaxy, which is estimated to have a radius of about 50,000 light -years. In the regions of the II population, such as galactic or globular clusters, as well as in the central bulge of the Milky Way, there are other giant stars and red hypergiers such as you canis majoris or blue supergiants such as Rigel, estimated to at least 62 to 78 solar radii. Galactic clusters usually contain about 1,000 of these largest stars according to solar radius and globular clusters can contain up to 1,000,000 such stars.
Although size is an important method of stars measurement, other factors such as solar luminosity and sun mass are also important, and they can be inconsistent, although two stars are of the same size. The red giant star like Betelgeuse with a 1,180 solar radius has a solar mass so light that its surface density is less than the atmosphere on the ground. On the other handThe stars would weigh more than one ton on the ground.
An important diagram for classification of stars using a spectral class or temperature against absolute brightness is the Hertzsprung -russell diagram. The H-R scheme shifts the stars by lowering the temperature in the letters: O, B, A, F, G, K and M. The Sun is classified as a G-type star in this range and stars in the range F or K are also considered the most stable stars, with the possible lifetime of supporting planets in orbit around them. The F type stars, such as Canopus and Procyon, have an average of 1.7 solar radius and type K stars as Aldebaran have an average solar radius of 0.8.