This dusty gas coming from the nucleus is heated by the sun and forms a glowing hot cloud around the comet called the coma.
Comets also develop dust and gas tails.
Draw a comet at its perihelion, and include the tail. Comets are usually seen only in the night sky. Furthermore, it is important to think about the earth and the comet, and their relative positions to each other as they orbit the sun. Also, the comet we see may be on the far side of the sun from the earth, and thus visible at early evening or early morning. A comet can lose hundreds, or even thousands of kilograms of material each second as it passes by the sun and forms a dust tail.