Planet Savenus/Timeline

4.6 billion years ago (4.6 Ga): Tiny planetesimals combined to form Savenus. 4.54 billion years ago (4.54 Ga): A giant object hit Savenus forming a moon. (Similar to how our Moon formed)                                                                                                                                                                  4.533 billion years ago (4.533 Ga): Another giant object hit Savenus, which reversed its direction of rotation. 4.527 billion years ago (4.527 Ga): Savenus lost its moon as the moon spiralled inwards and merged back with the planet. 3.8 billion years ago (3.8 Ga): Savenus had shallow water oceans on its surface. Surface temperature was habitable. 2.5 billion years ago (2.5 Ga): Savenus' early oceans evaporated due to proximity to Sun. Carbon dioxide dominated the atmosphere causing runaway greenhouse effect leading to high temperatures. Today: Savenus is the hottest planet in the Zoolar System. Even lead can melt on its surface. 100,000 years from now (+100 ka): Cloud cities will float on Savenus' clouds where conditions (temperature & pressure) are similar to Earth. 5 billion years from now (+5 Ga): The red giant Sun will engulf Savenus.