When the National Solar Observatory in Sunspot in the US state of New Mexico closed down a week ago, not much was said about it — the FBI was reportedly involved but we didn’t know what really happened. Naturally, speculation spread like wildfire, with ideas ranging from an accidental interception of military signals to a detection of alien life. Now, James McAteer, the Observatory director, has said that they haven’t detected aliens — but we still don’t know anything else.

Initially, Shari Lifson, spokeswoman for Association of Universities for Research in Astronomy (AURA) stated:

“We have decided to temporarily vacate this facility as a precautionary measure. And we’re working with the proper authorities on this issue.”

But things got more heated after Otero County Sheriff Benny House told the Alamogordo Daily News: “The FBI were up there. What their purpose was nobody will say.” Employees from the solar observatory made similar statements.

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“We have absolutely no idea what is going on,” says Alisdair Davey, a data center scientist at the National Solar Observatory (NSO). “As in truly nothing, which in itself is just weird.”

The entire staff was reportedly sent home, with all the buildings on site being closed. Even a small U.S. Postal Service office on the same site as Sunspot that mostly handles mail deliveries for the observatory has been shut down.

To clear out some of the speculations that have been floating around, this almost surely has nothing to do with aliens. Not only has McAteer issued a statement on this, but any aliens that would be in our relative vicinity wouldn’t likely be detectable with telescopes.

Rather, the reason for this shut down could be much more earthly: the Sunspot observatory overlooks Holloman Air Force Base, and there are suspicions that an observer could potentially peek into the U.S. Army’s White Sands Missile Test range. So this may have something to do with espionage.

“New Mexico is a center of national-security-related science, and for that reason it has also been a prominent venue for foreign espionage,” says Steven Aftergood, director of the Federation of American Scientists’ Project on Government Secrecy. “Spies go where the secrets are, and there are plenty of secrets in New Mexico.”

But this also seems rather unlikely, as all the telescope’s sensors would be pointed upwards, not towards an earthly objective. Lastly, the strict involvement of the FBI, which closed and evacuated the area but didn’t say a word about why they were doing this, only adds to the mystery. Sheriff House added:

“They wanted us up there to help evacuate but nobody would tell us anything. We went up there and everything was good. There was no threat. Nobody would identify any specific threat. We hung out for a little while then we left. No reason for us to be there. Nobody would tell us what we’re supposed to be watching out for.”

Hopefully, we’ll find out what happened soon enough.