![The World on Twitter: "If we put a giant mirror 10 light years away from Earth and looked at it through a telescope theoretically we'd see 20 years into the past. https://t.co/Z5bzKHvpVz" / The World on Twitter: "If we put a giant mirror 10 light years away from Earth and looked at it through a telescope theoretically we'd see 20 years into the past. https://t.co/Z5bzKHvpVz" /](https://pbs.twimg.com/media/C2ncqufW8AAC87I.jpg)
The World on Twitter: "If we put a giant mirror 10 light years away from Earth and looked at it through a telescope theoretically we'd see 20 years into the past. https://t.co/Z5bzKHvpVz" /
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
![What is the answer to this: if a star which is 100 light years away explodes right now, then after how much time will it be visible to us? - Quora What is the answer to this: if a star which is 100 light years away explodes right now, then after how much time will it be visible to us? - Quora](https://qph.cf2.quoracdn.net/main-qimg-240b23855d1da14c3714d93f9d2fe678.webp)
What is the answer to this: if a star which is 100 light years away explodes right now, then after how much time will it be visible to us? - Quora
![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 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](https://haygot.s3.amazonaws.com/questions/2070878_1529436_ans_89da27feb07743c2bb31b600f1c7dd31.jpg)