For decades, astronomers have searched for signs of extraterrestrial intelligence using radio telescopes and optical instruments, scanning the skies for artificial signals. Now, researchers are taking a different approach, this time looking much closer to home for alien artefacts that might already be in our Solar System. A new study published in Monthly Notices of the Royal Astronomical Society describes an innovative method for detecting potential extraterrestrial probes near Earth. Their approach; to use Earth's shadow as a natural filter to eliminate interference from human-made satellites and space debris. Modern skies are cluttered with thousands of satellites and millions of...