SUN
the star in the solar system
Its large mass which comprises 99.86% of all the mass in the Solar System. Its produces temperatures and densities in its core high enough to sustain nuclear fusion of hydrogen into helium, making it a main-sequence star.This releases an enormous amount of energy, mostly radiated into space as electromagnetic radiation peaking in visible light.
Polaris
refers to the star closest to the northern celestial pole
Polaris is a polar star that can be seen in the northern hemisphere. The current North Star is Alpha Ursa Minor. After the 31st century, Shaowei Zengba will become the North Star. Around 14000, Alpha Lyrae will become North Star.
Sirius
The brightest star in the sky
Sirius is so bright not only because of its high luminosity, but also because of its proximity to the sun. Sirius has twice the mass of the Sun, and its absolute magnitude is 1.42. It is 25 times brighter than the sun, but its luminosity is significantly darker than other bright stars, such as Canopus or Betelgeuse.
Star
A spherical luminous plasma condensed by gravity
Almost all the other stars that can be seen on the earth at night are in the Milky Way, but due to the very long distance, these stars seem to be fixed luminous points. A star will carry out a nuclear reaction of heavy elements in its core, transfer energy from the inside of the star, travel a long path, and then radiate from the surface to outer space. The core of a star undergoes nuclear fusion throughout its life, and at the end of life, the star will also contain degenerate matter.
