- Active galaxy with a jet stretching perpendicularly to the galaxy plane for distances much bigger than the galaxy's size, shinning in all the wavelengths.
- Planet around a double star one of which is a black hole or a neutron star.
Planet around a double star one of which is a black hole or a neutron star
I'm not sure that would be very habitable. Unless they're far apart, the neutron star/black hole would be accreting matter from its companion and the accretion disk would be emitting large amounts of x-rays. In some cases, they can occasionally increase in luminosity by a factor of 10, emitting powerful bursts of x-rays.
I believe anywhere near a neutron star is going to be extremely inhospitable. A very compact massive object, spinning really fast, and with a strong magnetic field, will produce intense synchrotron radiation, right?
Wikipedia says the magnetic field of a neutron star is between 10^8 and 10^15 times the Earth's. The amount of energy in a magnetic field that strong is mind-boggling. Anything anywhere near a neutron star will be bathed in intense broadband radiation, and whipped about by a rapidly-rotating magnetic field. Not a nice place to set up camp.
- Active galaxy with a jet stretching perpendicularly to the galaxy plane for distances much bigger than the galaxy's size, shinning in all the wavelengths.
- Planet around a double star one of which is a black hole or a neutron star.