... What is the value of the Drake Equation to students? ... These seven factors, discussed below, not only give us a tentative answer to the question "Is anybody out there?" but also point SETI researchers in directions that could lead to a discovery. ... Life on EarthтАж and Elsewhere , a booklet of activities on astrobiology and the search for life beyond Earth from the NASA Astrobiology Institute. http://nai.arc.nasa.gov/library/downloads/Astrobiology-Educator-Guide-2007.pdf . ...