Could a Twin Earth Detect Us?

A new study investigates whether an extraterrestrial civilization with technology similar to ours could detect Earth and evidence of humanity. Researchers found that Earth's radio signals, such as planetary radar emissions from the former Arecibo Observatory, are the most detectable technosignatures, potentially visible from up to 12,000 light-years away. Atmospheric technosignatures, like nitrogen dioxide emissions, are also becoming more detectable thanks to advancements like the James Webb Space Telescope and the upcoming Habitable Worlds Observatory. This research provides a multiwavelength framework for understanding the detectability of technology on other planets and shaping our search for extraterrestrial intelligence.