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...changed a lot. (Wow) This is where we did the search right here. Dallas Campbell: So this is the original room where you’d be looking …? Frank Drake: This is the original room. Dallas Campbell: It looks like no one’s cleaned up since about 1959. Frank Drake: It looks as though it’s become a store room. Dallas Campbell: So where would you actually, where would you...

...change in their properties (although there are exceptions). It's possible, however, to observe many different stars, all at different stages of their evolution, and try to build a picture of how they relate to each other in order to understand that evolution, in much the same way as attempting to work out the life cycle of a tree by walking through a forest. The sheer...