Take for instance the Crab Nebula, the result of the awe-inspiring supernova of 1054. Even a thousand years later, with the guts of the former star spread out over a volume ten light-years across, still maintains a roasting 15,000 kelvin, and is home to a rich, potent soup of radioactivity. The magnetic fields in the nebula alone are strong enough to whip up particles to half the speed of light. A Chernobyl-like Exclusion Zone full of radioactive particles and intense X-rays. No sane traveler should enter.
