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I'm relieved that we finally have a limitation. While looking at a living organism in different scales we discovered that in order to be alive you need to be at least 1 micron. When we kept going down in the scale 10-8, 10-9... We began to see atoms and electrons. At this point there was no longer an improbable assembly since we weren't  able to differentiate different organisms (we looked the same). Same idea when we began to go up the scale. There was a point where we just saw dots in space and couldn't distinguish us (Earth) from other planets or stars and so on.

Talking about space raises a lot of questions regarding our definition of life. Like other classmates have mention if there is life elsewhere we would probably share similarities (one or more categories).
Professor Grobstein mention how carbon atoms where made from the explosion of the end of a star's life(supernova) and how there hasn't been a supernova near our galaxy in a long time. Now I wonder has there been a supernova in other galaxies? Can we track it?