A star is ten light years away from the ...

A star is ten light years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?

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To solve the problem of how long it will take for us to see the change in brightness of a star that is ten light years away from Earth, we can follow these steps: ### Step 1: Understand the Concept of Light Year A light year is the distance that light travels in one year. Therefore, if a star is ten light years away, it means that light from that star takes ten years to reach Earth. ### Step 2: Determine the Distance The distance to the star is given as 10 light years. This means that light emitted from the star today will take 10 years to reach us. ...

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How many light years alpha centauri away from the earth?

1.29

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A star is 20 light years from the Earth. How much time does it take for the light from the star to reach the Earth ?

60 years

20 years

6 years

15 years

Two stars are 10 light years away from the Earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600 nm. To see the stars just resolved by the telescope, the minimum distance between them should be (1 light year = 9.46 xx 10^(15)m) of the order of :

`10^6` km

`10^8` km

`10^11` km

`10^10` km