Astronomy Picture of the Day . Colors of Comet Pojmanski . ... Credit Copyright: Adam Block ( Caelum Observatory ), R. Jay GaBany ( Cosmotography.com ) Explanation: Comet Pojmanski flew by planet Earth last weekend on a surprise trip through the inner solar system. Then an easy binocular target for morning skygazers , Pojmanski ultimately showed off a long tail , but it also presented some lovely green-blue hues as gas molecules in its tenuous coma and tail fluoresced in the sunlight. ...