The distance between Altair and Vega and the earth? How far is Altair from the earth? How far is Vega from the earth? How far is Altair from vega? Are they brighter than the sun?

The distance between Altair and Vega and the earth? How far is Altair from the earth? How far is Vega from the earth? How far is Altair from vega? Are they brighter than the sun?

Vega is 2.6 times the mass and 33 times the volume of the sun, and is about 26.5 light-years away from the earth
Altair's diameter is a little larger than that of the sun, its brightness is about 7-8 times of that of the sun, and it is about 16.8 light-years away from the earth
The distance between Altair and Vega is not clear

What is the nearest star to the earth

The sun
The distance between the sun's far point and the earth is 152 million km and 147 million km respectively, with a difference of 5 million km

Propagation speed of light in vacuum______ &M / s. light years are______ &If a star is 10 light-years away from the earth, we can see its light is______ It was issued five years ago

(1) The propagation speed of light in vacuum is 3 × 108m / S; (2) light year is the unit of length. If a star is 10 light years away from the earth, it will take 10 years for its light to propagate to the earth before we can see it