The stars are located millions and trillions of light year distance away from the Earth, therefore they take time to reach our planet Earth. Hence, option (d) is correct.
The given problem is based on the concept of illumination of heavenly bodies and the change in the intensity of illumination with distance. The action of emitting the light rays is known as illumination. The heavenly bodies such as Stars are located at a distance which are measured in terms of light years. Light year is an Astronomical unit used to measure distance between distant Celestial bodies.
And mathematically,
[tex]1 \;\rm light \;\rm year = 9.50 \times 10^{15} \;\rm m[/tex]
But in actual condition, no star is located at an exact distance of 1 light year. They are majorly located at the millions and trillions of light years from the Earth and light travels with the speed of [tex]3 \times 10^{8}\;\rm m/s[/tex], due to which it takes time to reach on Earth.
Thus, we conclude that the stars are located millions and trillions of light year distance away from the Earth, therefore they take time to reach our planet Earth. Hence, option (d) is correct.
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