There are many types of life. On Earth, these range in size from microbes to blue whales and giant sequoia trees. Now, estimate the number of planets in our galaxy that have intelligent life with which we might someday communicate.
There are many types of life. On Earth, these range in size from microbes to blue whales and giant sequoia trees. Now, estimate the number of planets in our galaxy that have intelligent life with which we might someday communicate.