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You can check the Wikipedia article "List of nearest stars". Note that it is quite possible that not all stars up to that distance have been discovered, since red dwarves and brown dwarves are quite difficult to detect.
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How many stars within 50 light years from earth?
According to SIMBAD, ~970. But there's a lot of stars within 50 light years whose distances aren't known. There's quite a few stars within 50 light years. To get a good estimate, we should consider how many stars within 20 light years, and go from there. The nearest 25 light years are really well catalogued, and the current census is 200 stars. Now, through knowledge of Geometry, one can say that if you multiply the radius of a 3D shape by a number, x, the volume will increase by the x^3. Why 3? because it's a 3D shape. So we double our sphere from 25 to 50 light years. So thus the volume increases by 2^3 = 8 times! So there are 8 times as many stars within 50 light years as there are within 25 light years. 200 * 8 = 1,600 stars (estimate).
When do stars appear?
The light emited by stars can take thousands of years to reach the Earth, because the stars can be located thousands of light years away. Stars viewed from Earth can only be seen at night because the light from the sun creates a glear on the atmosphere.
Is betelgeuse the farthest star from earth?
No, Betelgeuse is about 640 light-years from earth, but some stars are many billions of light-years away.
Are the hottest stars the red stars?
Red stars are the coolest. They are usually between 3,000-6,000 degrees Fahrenheit. They include Proxima Centauri (4.2 light-years from Earth) and Betelgeuse (350-650 light-years from Earth). The cooler and smaller the star, the longer it lives. Blue stars are the hottest, but the LBV types, such as Eta Carinae (7,500 light-years from Earth) and R136a1 (163,000 light-years from Earth) are the hottest and heaviest in the universe. They could range temperatures from 50,000-100,000 degrees Fahrenheit.
What is the unit of measurement of the distances of the stars from the earth?
Light Year is unit for all astronomic distances
Do All stars in a constellation have to be within a light year?
No. No star other than the sun is within a light year of Earth. Most of the stars in constellations are dozens to hundreds of light years away.
How many stars within 50 light years from earth?
According to SIMBAD, ~970. But there's a lot of stars within 50 light years whose distances aren't known. There's quite a few stars within 50 light years. To get a good estimate, we should consider how many stars within 20 light years, and go from there. The nearest 25 light years are really well catalogued, and the current census is 200 stars. Now, through knowledge of Geometry, one can say that if you multiply the radius of a 3D shape by a number, x, the volume will increase by the x^3. Why 3? because it's a 3D shape. So we double our sphere from 25 to 50 light years. So thus the volume increases by 2^3 = 8 times! So there are 8 times as many stars within 50 light years as there are within 25 light years. 200 * 8 = 1,600 stars (estimate).
Is the distance between stars and earth measured in kilometres or light-years?
Light Years.
Does it sometimes take millions of years for starlight to reach earth?
Not for the stars you can see without a telescope. All of the stars you see at night are within a few hundred light years of Earth, so it does not take the light more than a few hundred years to reach us. There are stars in other galaxies that are millions or even billions of light years away. That light does take millions to billions of years to reach us, though the stars are too far away for us to thee them individually.
In astronomy when said stars are close together as in constellations how far in light years are they distanced from one another?
Could be any distance. Generally, however, the bright stars that are part of constellations are within a few hundred light years of Earth.
How many years does starlight travel?
It depends on the distance of the star to Earth. The distance to the star in light years is the number of years the light took to get here. Most of the stars we see at night are within a few hundred light years of Earth. The closest star other than the sun is about 4.2 light years away.
When do stars appear?
The light emited by stars can take thousands of years to reach the Earth, because the stars can be located thousands of light years away. Stars viewed from Earth can only be seen at night because the light from the sun creates a glear on the atmosphere.
In distance in space between stars and earth measured in kilometres or light years?
in light years
How far are bayer stars from earth?
it is light years away
Of the 20 brightest stars observed from earth how many are within 32 light years of the sun?
6, 7 if you include the SunSunSiriusAlpha Centauri AVegaProcyonAltairFomalhaut
Is betelgeuse the farthest star from earth?
No, Betelgeuse is about 640 light-years from earth, but some stars are many billions of light-years away.
When should you use light years?
Light years are used to measure distance from Earth to distant stars and planets.
