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We should shine lasers into space if we want to hide our presence from aliens, two US-based astronomers suggest. The beams could compensate for the dip in light the Earth creates when it passes in front of the Sun, as viewed from far-off worlds, they contend.
 extraterrestrial hide laser
The discovery of more than 330 planets outside our solar system in recent years has helped refine the number of life forms that are likely to exist. The current research estimates that there are at least 361 intelligent civilisations in our Galaxy and possibly as many as 38,000.
 philosophy life extraterrestrial astronomy