What is the biggest star in the world?

The largest star in the world: the star with the largest mass known to mankind is BAT99-98, and the star with the largest volume known to mankind is Stevenson 2- 18.

1. The most massive star known to mankind is BAT99-98.

BAT99-98 is a star in the large magellanic cloud and a Wolf-Rayet star (blue giant). It is located near the cluster R 136 of the 30 Nebula of the Sword. It is the largest known star and one of the brightest stars, with a mass of 226M☉ and a brightness of 5,000,000 L ☉. This star releases a large amount of mass through the stellar wind of 1600 km per second, and its surface temperature is 45,000 Kelvin, so it is classified as WN6 star.

2. The largest known star is Stevenson 2- 18.

Stevenson 2- 18, also known as Stephenson 2DFK 1 or RSGC2- 18, is a red Supergiant star on the shield. Discovered by American astronomer Charles Bruce Stevenson in 1990. Located near Stephenson 2, it is an open cluster about 6,000 parsec away from the Earth, and it is considered to be one of a group of stars in close proximity. It is the largest known star and one of the brightest red Supergiant star. Its radius is about 2 158 times that of the sun, which is equivalent to its volume being 654380+000 billion times larger than the sun.

Characteristics of stars

1, physical characteristics

The first is the size of the star. The size of a star varies with its mass, from a very small red dwarf to a huge giant. Second, the brightness of the star. The brightness of a star is related to its temperature and radius. The higher the brightness, the hotter the star. In addition, the color of a star is also one of its physical characteristics. The color of a star is directly related to its surface temperature. Stars from red to blue have different temperature and spectral characteristics.

2. Behavior characteristics

The first is the movement of stars. Stars are constantly moving in the universe, some rotate around the center of the Milky Way at a constant speed, while others experience more complicated trajectories. Secondly, the life cycle of stars. The life cycle of a star is divided into several stages, starting with the collapse of gas clouds, gradually evolving into mature stars, and finally becoming red giants or black holes. In addition, there will be a supernova explosion inside the star, and a lot of matter and energy will be ejected during the explosion.

Reference to the above content: Baidu Encyclopedia -BAT99-98