[triceratops]

There have always been scientists or natural philosophers or shamans (or whoever else was the most learned of their respective times) who have said "X is impossible" for some X. So far, they've always been proven wrong by a new discovery, often from an unrelated field, that somehow makes X possible. Are we so certain that it's different this time? Interstellar migration won't come soon enough to save us from the climate crisis, but to say it'll never happen is a strong statement.