Physical Danger
You'd have to be a real klutz to put yourself in harm's way with this job, and if you're that accident-prone you'd probably be just as much at risk in any other job. Actually, you'd probably be unemployed, because no one wants to hire someone who's too clumsy to look through telescopes and write grant proposals. Sorry, Charlie.
So yeah, if you're concerned about safety in your future career, fear not—there's pretty much no gig safer than this one. Put it out of your mind, and for your own sake, don't go asking all your colleagues whether it's safe to use the equipment. You don't want the office joke to be about how you're afraid of a spectrograph.