[이광식의 천문학+] How big is the biggest star in the universe? Giant “Stevenson 2-18”: ZUM. story



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Estimation of the dimension of the Sun by Stevenson 2-18

It could be attention-grabbing and helpful to boost our notion of the universe of ‘development’. First, if we had been to understand the largest object round us, it might be the Sun. It is 109 occasions the diameter of the earth, dwelling to eight billion folks, and 1.3 million in dimension. The solar is so infinite that it is a disgrace to say that the solar guidelines the photo voltaic system. It represents 99.86% of the mass of all celestial our bodies in the photo voltaic system.

Even that solar is nothing but when it carries it to the galaxy and the sky. This is why there are such a lot of big stars in the universe. The largest stars are referred to as giants, and even the well-known large Betelgeuse in the constellation Orion has a diameter greater than 1,000 occasions the diameter of the Sun. When this star is pulled towards the Sun, it might be roughly the dimension of Jupiter’s orbit.

However, it is common for the stars to see Betelgeuse as self-importance. The VY Canis Majoris (VY Canis Majoris) discovered in the constellation of Canis Major has been confirmed to be 2069 occasions the Sun resulting from observations in 2020. It is bigger than the Saturn system. Although it was as soon as regarded as the largest star in the historical past of commentary, a extra complicated evaluation exhibits that this radius is smaller than earlier measurements. It is about 3900 mild years from Earth.

The supergiant that surpassed VY Canis Major to change into the most large star was found, a star named Stevenson 2-18 found by American astronomer Charles Bruce Stevenson in 1990.

The purple star in the center is Stevenson 2-18. The vivid star above is Stevenson Star Cluster 2.

One of the 40 purple giants in the Stevenson 2 open cluster, positioned in the constellation Shields, about 20,000 mild years from Earth. It doesn’t belong to the arm of Orion, the round arm to which the Earth belongs, however to the arm of the constellation Shield-Crucio.

So how big is this star? Its diameter is about 2.9 billion kilometers, 2,150 occasions the diameter of the Sun. It will take greater than 8 hours to orbit the star at the pace of sunshine, and it’ll take 1,100 years to journey round the star at a pace of 900 km/h. It exceeds the interval of Goryeo and Joseon Dynasty mixed. If this star is pulled into the solar’s orbit, it would swallow Saturn’s rings and moons. Can you think about that one thing could possibly be that big? Of course, this star belongs to the Milky Way, however many astronomers strongly consider in the isotropism and monotheism of the universe, which implies that it is not a lot to assume that it is the largest star in the universe.

The most large star in the universe, Stevenson 2-18, is about 14 to twenty million years previous, the similar as different stars in this group, making it very younger in comparison with different stars. As stars grow old, their life spans change into a lot shorter. This is as a result of the larger the star, the sooner the nuclear fusion, which consumes extra nuclear gas.

Stevenson 2-18 is anticipated to die in a supernova explosion inside hundreds of thousands of years after which collapse right into a black gap.

Kwangsik Lee Science columnist joand999@naver.com

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