But aliens are so much more fun.It was a Klingon ship, they forgot to activate their cloaking device.........It being a post office it could have something to do with a package bomb or poison sent through the mail.
They mailed a package to the observatory? Yeah. Maybe.
Another theory is that the observatory captured an image of "something" and they were put in immediate lockdown before they could disseminate it.
You might want to check out "anomalies" appearing near the Sun
![dunno :dunno: :dunno:](/styles/smilies/dunno.gif)