How do constellations form in the sky?
When you take a quick look, the glittering stars seem to be strewn carelessly all over the velvety dome of night. After you have feasted your eyes on their stupendous beauty for a while, you notice that they are arranged in odd shaped designs. These starry patterns are the constellations, Your eye soon learns to recognize some of the constellations that adorn the starry night, one star design may remind you of a sprawling letter M. Ancient star gazers saw it as a seated lady and they named it for their queen Cassiopeia. Most of our constellations were named at the dawn of history, and some of the patterns are not quite what they were in ancient times. Gemini, the Heavenly Twins, has changed quite a bit in the past 2,000 years. It is convenient to chart the stars as though they were all at the same distance and painted on the inside of a vast basin. Modern astronomers call this inverted bowl the celestial sphere, and they know that the stars really are at vastly different distances from
