Gravity: An entry from Macmillan Reference USA's <i>Macmillan Reference USA Science Library: Space Sciences</i>

This digital document is an article from Macmillan Reference USA Science Library: Space Sciences, brought to you by Gale®, a part of Cengage Learning, a world leader in e-research and educational publishing for libraries, schools and businesses. The length of the article is 974 words. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser. From the history of space exploration to the future of space business, this set offers a broad survey of the space sciences. Includes biographies of scientists and the space-related job market.