In this article, we'll find out how galaxies were discovered and what types exist, what they're made of, their internal structures, how they form and evolve, how they're distributed across the universe, and how active galaxies might emit so much energy. Contents What Is a Galaxy?
These are small pieces of plastic on your bikes to reflect the light from car lights so that drivers can see you.Ride your bike in the same direction. And don’t think that traffic lights and signals are just for those driving cars. They are important for you too, so always pay close...