The planets that are much near in our solar system are those that are very smaller than the stars and in the same way as the moon reflects the sunlight.
Thus based on the alien astronomers to detect the light of the planet that is the solar system a product of the is calculated to be as 4.54 x 10.
D, the universe began 13.8 billion years ago (I assume this test may be a little outdated since the updated version is 13.8 billion years ago, but D is the closest to the answer, so I would go with D).
