1. There are more microbes than the total number of all humans who have ever been born in just *one* linear centimeter of your lower colon.
Neil deGrasse Tyson: In one linear centimeter of your lower colon, lives and works more microbes than the total number of all humans who have ever been born.
2. In about 7 billion years, our own Milky Way Galaxy and the Andromeda Galaxy will collide.
NGT: The nearest large galaxy to our own Milky Way is called the Andromeda Galaxy. We are on a collision course with one another. In about 7 billion years, we will collide. Our beautiful spiral patterns will be completely distorted, and in there gas clouds will collide, sticking together like two hard marshmallows. Where they stick, stars are born. We have a black hole in the center of our galaxy, and so does Andromeda. Those black holes will one day find one another and collide. Such is the fate of the Milky Way system.
3. There’s evidence that there was once life on Mars.
NGT: Mars has evidence of once having had liquid flowing water on its surface. All the water is gone today, so Mars is tantalizing as a prospect for a place that once had life.
4. Europa has an ocean of liquid water even though everything in its location should be completely frozen.
NGT: Jupiter and Europa and its system is well outside of the Goldilocks Zone of the sun. Everything should be completely frozen out there, but it’s not. The stress from Jupiter’s gravity and other surrounding moons pumps energy into Europa, melting its ice, having created an ocean of liquid water that’s been liquid for billions of years.
5. If you fall into a black hole, your body would become distorted until you’re a stream of atoms.
NGT: You want to avoid black holes. You fall in, you’re not coming out. It distorts the fabric of space and time, and you’re occupying the fabric of space and time, so you get distorted. Your feet will fall towards the center of the black hole faster than your head does, so you will snap into two pieces and then your two pieces themselves would snap into two pieces. You’d go from one, to two, to four, to eight, to sixteen, to thirty-two — all the way until you are a stream of atoms headed to the cosmic abyss.