When this event happened, there was an ice age on planet Earth and humans were battling the elements to survive. Humans did survive and civilisations have come and gone, empire have risen and fallen and the human race has been through many trials and tribulations. They have managed to look into the heavens and build telescopes that can look at the stars. They have discovered that the stars they look at are often in the past. They are witnessing an event that happened 20,000 years ago, yet only now do we realise that such a momentous event took place. It has taken 20,000 years of light speed for this information to reach us. If someone at the other end had a telescope and could look at Earth, they might look at Stone Age men hunting mammoths upon ice plains. They would have no notion we had adapted and evolved. It makes the mind boggle. All our silly little political squabbles seem meaningless when there is that vast eternity waiting for us.