Nebula

A nebula is an enormous cloud of gas atoms and tiny particles. Nebulae are the birth place of new stars and some dying stars leave nebula as wreckage. The smallest nebula is much larger than the solar system and the largest are hundreds of light years across. Some nebula is bright while others are dark. The brightness could be due to their atoms getting affected by the energy given out by neighboring stars. Dark nebulae appear as black starless areas, since they are absorbing light from stars beyond