There have been instances of flashes in space that were attributed to sprites and fairies. Now, I know these phenomena can be explained by natural means such as blue/purple lightning. But the concept made me wonder: how could sprites or fairies, as typically represented in folklore, theoretically survive in space?
I use the words fairies loosely, but I refer to the Tinkerbell kind rather than the fae that are biologically similar to humans. My fairies are small: about 2 inches high, and they have wings. In space, their wings serve to stabilize them so they can float through the hydrogen/helium atmosphere. If brought to Earth, they can flap their wings and fly like birds. They have some primitive form of speech, but their chatter is at sufficiently high frequency that humans can't hear them (>20,000 Hz).
Like Superman, they get their energy from electromagnetic radiation from the sun (or stars). They convert the solar energy into kinetic energy for flight. Because they get their energy to perform life functions from EM radiation, they have no need for any outside sources of nutrition. They also don't need oxygen to breathe.
My fairies could be captured and bought to Earth as pets. However, they are further away from the stars, their main source of energy in space. This makes them extremely weak because they can't produce sufficient energy. They are soon unable to fly, and eventually to move at all. If they are kept on Earth for a sustained period, they could die. Not to worry - my characters have found a way to sustain them using either light therapy such as the lamps used to treat SAD, or feeding them a form of liquid starlight which they harness from the stars.
Edit: Let's assume, for argument's sake, that my fairies do exist (at least in my fantasy setting). Is the science I use to explain the existence of my creatures in outer space valid? Or are there modifications I can make to their anatomy/physiology that would make their energy-converting, space-propelling superpowers more believable?
(I apologize if this edit in any way undermines or invalidates existing answers, but I was advised to make the question less science-based.)