On the space ship, returning to Earth from another planet

'anoth':9 'earth':7 'planet':10 'return':5 'ship':4 'space':3

'asteroid':2 'lagrang':6 'point':7 'tow':3

We will obscure the definition of "human"

Biological humanity will cease to exist first

'biolog':1 'ceas':4 'exist':6 'first':7 'human':2

A habitable exoplanet not currently known

'current':5 'exoplanet':3 'habit':2 'known':6

Includes planets, moons, asteroids, but not space stations

The question will resolve when the first alive human baby be born away from Earth. The distance from the surface of Earth at the moment of the birth must be at least 80km.

Edit: Human as defined as biological creatures with a homo sapiens lineage