There are other stars like giant stars which have exhausted hydrogen in their cores and are in various stages of evolution. The density of gases in main sequence stars are roughly the same as the main constituent is always hydrogen and helium. The size of stars depends mainly on its mass .
Why do stars of the same size look different?
When you gaze at the constellations, every star produces an image that’s the same size , but your retina isn’t sensitive enough to respond to the outer parts of those images except for the brighter stars — which therefore look bigger than the fainter ones.
Why do stars have different sizes?
But for all other stars, their sizes are determined by that simple balance: the force from the outward radiation, at the surface, has to equal the inward pull of gravitation . Larger radiation forces means the star swells to larger sizes, with the largest stars of all swelling to billions of kilometers.
What affects the size of a star?
In brief, a star’s size is predominantly set by its own mass . ... The mass and density of interstellar clouds appear to be important physical properties for determining the number of these cores, and thus the number of stars that the cloud will form.
Can stars be different sizes?
Stars come in many different sizes, colors, and masses . (The mass of an object is a measure of how much matter is in the object.) This activity discusses the types of stars that are in the main part of their “lives”, which is called the main sequence, and the sizes of these different classes of stars.
What are the 3 sizes of stars called?
- Super Giant Stars. The stars known a Super Giants are luminous stars with a mass more than 10 times higher than that of our sun and have started to decay. ...
- Giant Stars. ...
- Main Sequence White Dwarf Stars. ...
- Brown Dwarfs.
What’s the biggest type of star?
The largest known star in the universe is UY Scuti , a hypergiant with a radius around 1,700 times larger than the sun. And it’s not alone in dwarfing Earth’s dominant star.
Are All stars basically the same size?
1. Every star you see in the night sky is bigger and brighter than our sun. Of the 5,000 or so stars brighter than magnitude 6, only a handful of very faint stars are approximately the same size and brightness of our sun and the rest are all bigger and brighter.
Why are star different colors?
When matter gets hot enough, it emits visible light . When heated to the same temperature, light bulb filaments, horseshoes, and stars will emit the same characteristic blend of color (or wavelengths) of light. Stars are different colors — white, blue, yellow, orange, and red.
Do stars look the same?
All the stars (except for the Sun) are so very far away that even the ones that are close enough or bright enough to be seen without a telescope still look only like bits of glitter—just large enough to see, but too small to differentiate from each other with the unaided eye. Astronomers see them very differently.
What color star is the coolest?
Red stars are the coolest. Yellow stars are hotter than red stars. White stars are hotter than red and yellow. Blue stars are the hottest stars of all.
Which star is the hottest?
The hottest one measures ~210,000 K; the hottest known star. The Wolf-Rayet star WR 102 is the hottest star known, at 210,000 K.
Is Sun bigger than other stars?
The sun is many times larger than Earth but appears small because it is very far away. Even though the sun is very far from Earth, it is much closer than other stars. Because the sun is closer to Earth than any other star, it appears much larger and brighter than any other star in the sky.
What is the average age of a star?
Age. Most stars are between 1 billion and 10 billion years old . Some stars may even be close to 13.8 billion years old—the observed age of the universe.
Are stars bigger than the Sun?
Located around 9,500 light years from Earth, and composed of hydrogen, helium and other heavier elements similar to the chemical composition of our Sun, the star has a radius 1708 (±192) times larger than our Sun’s . That is nearly 1.2 billion km, resulting in a circumference of 7.5 billion km.
What are the 7 main types of stars?
There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M . This is known as the Morgan–Keenan (MK) system.
