Be careful not to look directly at your Helios Dragon while it's hatching, and not just because a watched egg never hatches. As soon as the egg begins to crack, fissures of light erupt from its contents. Shield your eyes from the blinding flames as the Helios Dragon darts upward in the sky to rejoin the Sun.
Old Caretaker legend explains how each of the stars in the night sky are actually Helios Dragons that have flown away from Earth. Scientists have tried to monitor whether or not Helios Dragons could achieve escape velocity while they are flying, but the magnitude of brightness from flying Helios Dragons makes it impossible to measure accurately.
Helios Dragons are able to be seen by humans so long as they are not traveling at high speeds. When Helios Dragons are resting on your Dragon Island, they shouldn't cause any discomfort to your eyes. It's best to wear sunglasses though, just in case.
No one knows where Epic Helios Dragons go when they fly away on their trips in the sky. However, they always return from their voyage with new flames licking from their backs and wings, hotter than any campfire on your Island. Some fanatical Caretakers believe Helios Dragons fly to the Sun itself, and carry back a piece of the Sun to their homes.