Sometimes they may rotate and catch the sunlight only at certain angles, which will give the appearance of a white light blinking on and off as it moves. This can sometimes be quite dramatic, and appear as a bright flash, which has no doubt sometimes been mistaken for signalling. Other times they may be moving across the sky and then suddenly appear to blink out as the sunlight is no longer catching them.

Due to the fact they are out in space they are never very large in size, but can sometimes appear brighter than the other stars in the sky.