1. Try using the Drake equation with values that you find reasonable. How many civilizations do you estimate there are in our Galaxy? 2. Discuss the possible biological effects of our probes that...

1. Try using the Drake equation with values that you find reasonable. How many civilizations do you estimate there are in our Galaxy?

2. Discuss the possible biological effects of our probes that visit other life-sustaining worlds.

3. What social effects might probes from other worlds have on us?