The Stuff Between the Stars: How Vera Rubin Discovered Most of the Universe

Nickel, Sandra: - Sandra Nickel is a former New York City lawyer who now lives with her family in Switzerland. She is a graduate of the Vermont College of Fine Arts with a master of fine arts in writing for children and young adults. Helena Perez Garcia is a Spanish illustrator whose work has appeared in magazines, newspapers, and books around the world. Her clients include Penguin Random House, The Body Shop, Tate Publishing, and Reader's Digest, among many others. She currently lives and works in Madrid.