"Searching for signs of alien life is nothing new. Since the first believer, people have wanted to communicate with whatever might be out there. Learn about the satellites and observatories being used today to send and receive signals from space, and find out if anything has answered our call"--
Searching for signs of alien life is nothing new. Since the first believer, people have wanted to communicate with whatever might be out there. Learn about the satellites and observatories being used today to send and receive signals from space and find out if anything has responded to our call. Includes 21st Century Skills and Content, sidebars, activity, table of contents, index, and glossary.
