The Survivors After the Earth Was Split in Half

No system, no rebirth, no cheats, unhappy writing, plot flow, pure idea literature, wit fighting, madness. With a slight wave of God's hand, the earth was broken in half and suffered catastrophe. The spraying magma was the earth's last space ballet. The only two remaining earthlings went to the depths of the universe to find the answer to all this. When the world was destroyed, everyone went home to see their families for the last time, except for his brother. With confusion and regret about his brother, the male protagonist left the earth. Are his tears shed for the civilization of the earth, or for his brother alone? Has his brother really abandoned him? A butterfly flaps its wings gently. The same beginning, different results, and the chaotic system finally undergoes earth-shaking changes. When the development of civilization locked at the speed of light comes online, what other efforts can civilization make to resist the law of entropy increase? What role does human civilization play in the galaxy? Where should the two remaining Earthlings go?