Book excerpt: In our galaxy, there are stars and solar systems. There are comets, asteroids and a whole lot of solid material. There is also a lot of space between star systems. We call this space between star systems the Interstellar Medium. In this area, there are great clouds of gas and dust. They can range in size from a few light years to many thousands of light years across. Some of them glow. Some are so dark that we cannot see through them. These massive clouds of gas and dust are called nebulas. How much do you know about nebulas? Do you know the answers to these questions? What is the difference between a dark nebula and a light nebula? Is there a nebula in the Milky Way galaxy? Can a nebula become a star? What is an emission nebula? How did some nebulas get their names? Find out more about nebulas and amaze your family and friends with these fun facts. Ages 8 and up. All measurements in American and metric. Reading Level: 6.7 Educational versions include exercises designed to meet Common Core Standards. LearningIsland.com believes in the value of children practicing reading for 15 minutes every day. Our 15-Minute Books give children lots of fun, exciting choices to read, from classic stories, to mysteries, to books of knowledge. Many books are appropriate for hi-lo readers. Open the world of reading to a child by having them read for 15 minutes a day.