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Our solar system is more than six billion years old. Scientists believe there was life on Mars four million years ago. Many people on Earth believe they are the only life forms in the universe but, with millions of undiscovered planets out there, can that really be true? Find out how life began on Earth, how far humans have come in a short period of time, and how we might measure up to other worlds. Includes 21st Century Skills and Content, sidebars, activity, table of contents, index, and glossary. "Our solar system is more than 6 billion years old. Scientists believe there was life on Mars 4 million years ago. Many people on Earth believe they are the only life forms in the universe. But, with millions of undiscovered planets out there, can that really be true? Find out how life began on Earth, how far humans have come in a short period of time, and how we might measure up to other worlds"-- Provided by publisher. Activities for further learning Author/Illustrator biography Glossary of key words Index Infographics Informative sidebars Table of contents For years, the possibility of alien life was a science fiction idea, a potential hoax, or a government cover-up inside of Area 51. Then, in 2020, it happened. The Department of Defense released footage of "unidentified aerial phenomena." Other life is out there, and science is leading the way to prove it. The next generation of STEM is here. Includes 21st Century Skills and Content, sidebars, activity, table of contents, index, and glossary.