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“You’ll travel nearly a trillion miles in your lifetime, even if you never leave home. Here’s how.”

exoplanets

super-earths

The universe is about 14 billion years old The universe is flat The universe is expanding

8 planets in our system

Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune

Definition of a planet:

  • orbits around a sun
  • “round enough”
  • cleared the neighborhood around its orbit

Pluto isn’t a planet because it didn’t meet the third criteria

All galaxies seem to rotate once every billion years, regardless of size

perihelion

Milky Way Andromeda

Black Holes

“Black holes are regions of spacetime from which nothing, not even light, can escape. They are formed when a massive star collapses at the end of its life, and they are some of the most mysterious and fascinating objects in the universe.”

“It might be like The Matrix inside a black hole”

White Holes