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Important notices

In a dark place, our pupils dilate. A person will feel discomfort and lost his dark adaptation if a strong light shines on his eyes suddenly. Photos of wispy nebulae and galaxies can only be taken with extended exposure. Not only flashlight will not help, it will become a nuisance.


Red light is less irritating to the eyes and helps to preserve our night vision. A red torch can be prepared easily by wrapping a sheet of red cellophane, cloth or even a plastic bag over an ordinary torch.


Since flames are bright and the hot air around causes the image to shiver, the surface details of the celestial body cannot be resolved when a fire is around. Use a warm pack or put on more clothes to keep warm.