This 48 piece Gravity In Space set will help teach student about gravity and how it affects movement of stars, planets, and other objects in space. Teach students that gravity exists in space, teach them about how mass and distance changes gravitational forces, how different amounts of gravity change space, and more. This set includes 16 PNG color illustrations, 16 PNG gray scale black and white versions and 16 line versions. These are high resolution (300 dpi) transparent background graphics. N