The Strong Gravitational Pull

In the early age, Humans made an astonishing discovery regarding black holes. They discovered that due to their huge gravitational pull, the closest black holes where able to pull a person's spirit, after death, into their centers, destroying them.
As of the 770's from the third millennium, the more elderly started to be transported from their home planet (planet Earth) to interstellar planets unprovided of a black hole's gravitational pull, to avoid having their spirit killed.
Today, 6 thousand years later, most of these amazingly colonized interstellar planets are populated with humans all age and governed by our ancestors' spirits.

Planet Earth remains as a wild planet where the more adventurous go to enjoy the planet's natural state, but rarely stay.