In January, we reported on a series of seven fast radio bursts (FRBs) that scientists were able to pinpoint to a specific galaxy more than three billion lightyears away. These bursts repeated at a set duration and lasted only one to five milliseconds each, perplexing astronomers and physicists alike and leading to a whole slew of theories as to their source, including the idea that they could be produced by alien life.

Other theories include supermassive black holes ejecting material back into space, supernova explosions greater in scale than any we’ve ever witnessed, and a list that continues to grow as our planet’s greatest thinkers and mathematicians compare notes, scratch their heads, and try their hardest not to jump to any conclusions that revolve around little green men.

However, a group of scientists and researchers at the Harvard-Smithsonian Center for Astrophysics (CfA) aren’t shying away from the possibility that these seemingly intelligent radio bursts could be produced by an alien civilization, and although that may sound crazy, nothing the human race has discovered in the nature of space can explain away these phenomena, leaving room to consider that perhaps these bursts aren’t naturally occurring at all.

“Fast radio bursts are exceedingly bright given their short duration and origin at great distances, and we haven’t identified a possible natural source with any confidence,” said Harvard professor Avi Loeb in a press release. “An artificial origin is worth contemplating and checking.”