Was there ever life on Mars? Will Earth be hit by an asteroid? Are there any other solar systems? Backyard Astronomy guides you through the mysteries of the universe and tells you everything you need to know about becoming a proficient backyard astronomer.Was there ever life on Mars? Will Earth be hit by an asteroid? Are there any other solar systems? Backyard Astronomy guides you through the mysteries of the universe and tells you everything you need to know about becoming a proficient backyard astronomer.
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