The Off-Roading Astronauts of Apollo
Astronomers has discovered thousands of planets outside of our solar system over the past few decades, revealing a multitude of captivating worlds within our galaxy. This golden age of exoplanet discovery raises an alluring question: If we can spot worlds orbiting stars from Earth, could speculative alien civilizations spot Earth from their own vantage points?
Most exoplanets are discovered as they pass in front of their host star from our perspective, causing a very slight dip in stellar brightness that can be detected by telescopes on Earth. This technique, known as the transit method, has enabled scientists to spot and even characterize basic details about these worlds, including whether they might be potentially habitable.