Let's say that I happened to stumble upon a nano-teleporter (it does not matter how) and it subsequently transported me to a massive protected complex (within the Earth's Core) which housed several "stargate" like portals.
I subsequently found that these portals led to hundreds of thousands of uninhabited habitable planets within the Universe (both known and undiscovered).
Should I then inform the rest of the human race? Or what would you do?