Imagine you're sitting relaxed in a dark, forgotten corner of asteroid X, five billion kilometers from the sun. Imagine looking up and seeing the feeble sunlig

Imagine you're sitting relaxed in a dark, forgotten corner of asteroid X, five billion kilometers from the sun. Imagine looking up and seeing the feeble sunlight. Some of it gets reflected back and starts a long journey toward some telescope on Earth. Now imagine seeing "extremely powerful laser" from earth. Some of it gets reflected ... (ditto). For your method to work, the latter must be more powerful than the former. In other words, if you point your laser at Mars, a Martian should suddenly find the Earth shining brighter than the sun. I don't believe mankind possesses such power yet (thank god).