What has one head, sometimes has tails, and orbits the Sun? A comet! These giant balls of ice, mixed with rock and dust, orbit the Sun. When they are very far from it, they have no tails. When they get closer to the Sun, they heat up and give off a cloud of gases and dust--and form tails. Early readers will be taken on a journey through outer space in simple yet captivating text as they learn these and other fascinating facts about comets. Each 24-page...

What's the closest planet to our Sun? Mercury! Mercury orbits the Sun very quickly-in fact, it circles the Sun four times more quickly than Earth. With a surface covered in craters, it's also the smallest planet. Early readers will be taken on a journey through outer space as they learn these and other fascinating facts about Mercury. Each 24-page book features controlled text with age-appropriate vocabulary and simple sentence structure. Stunning...

What planet has at least 12 rings and 53 moons? Saturn! The planet's bright rings are made of pieces of rocks and ice. Some pieces are as big as a house. Scientists have sent spacecraft to learn more about the planet--and expect to discover more moons and rings. Early readers will be taken on a journey through outer space as they learn these and other fascinating facts about Saturn. Each 24-page book features controlled text with age-appropriate vocabulary...