"Ever since Williamina Fleming was little she was curious, and her childhood fascination with light inspired her life’s work. Mina became an astronomer in a time when women were discouraged from even looking through telescopes. Yet Mina believed that the universe, with its billions of stars, was a riddle—and she wanted to help solve it. Mina ultimately helped to create a map of the universe that paved the way for astronomers. Newbery...

Describes the life and work of Eratosthenes, the Greek geographer and astronomer who accurately measured the circumference of the Earth.

"A biography of Carl Sagan focusing on his childhood and culminating in the Voyager mission and the Golden Record"--Provided by publisher.