Using 1. the number of stars in the galaxy (N*) & 2. the age of the Galaxy (TG) & 3. the fraction of stars with planets (fp) & 4. the number of environments per star that could possibly support life (ne) -- QUESTION: 1A.) FROM the drake Equation - Provide estimates for each of the four items listed above to be the best known in the Drake equation, and cite your source for each estimate (the textbook, a reliable website...) 1B.) Give estimates for each of the remaining four items in the Drake equation you have identified as most uncertain. Provide a reasonable explanations for all your estimated values.