A nebula is an <em>enormous</em><em> </em><em>cloud</em><em> </em><em>of</em><em> </em><em>dust</em><em> </em><em>and</em><em> </em><em>gas</em><em> </em>occupying the space between stars and acting as a nursery for new stars
<em><u>A strain of the species bred for use in aquariums has established non-native populations in waters of the Mediterranean Sea, the United States, and Australia. It is one of two species of algae listed in 100 of the World's Worst Invasive Alien Species compiled by the IUCN Invasive Species Specialist Group.</u></em>
