"Back then, it was just kind of a curiosity, but now it's becoming an annual tradition," Tyson told NBC News. "It started out with tens of people, and then hundreds, and now there are thousands of people who block traffic. I've alerted the police department of this, just as an issue of public safety, that perhaps they should close off streets. We're still trying to resolve that. They're not accustomed to closing off streets for cosmic reasons."