Surprising but true: Earth was more visible to aliens during the time of the dinosaurs

The study found that oxygen, methane, ozone and methane were more prominent in the spectra of the Earth 100-300 million years ago than they are now. This helps to visualise what Earth might have looked like to other observers, and indicates what to look for when searching for life on other planets.

So there is hope that detecting complex and advanced life elsewhere in the Universe is easier than we think!