>tfw they realize the earth and moon's orbits around

Yeah, the Solar system isn't stable, but it'll take loooooong time before it will cause any trouble for us.

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>sun begins to turn into red giant
>gravity fluctuations destabilize moon's orbit
>moon crashes into earth and survivors sent into space to repopulate the earth afterwards watch as the impact sends it hurtling into the sun
>there is chaos on board, however they eventually accept death is inevitable and set a collision course with mars so bacterial samples are spread across its surface
>billions of years later life on mars warmed by the red giant sun achieves sapience and wonders how life could have arisen when ancient mars had poor conditions for abiogenesis
>one being hypothesizes that it must have come from a planet that existed before the sun changed
>theory is rejected because the bacteria couldn't have survived the journey from a rock ejected by an asteroid impact
>all that is left of our civilization is a rejected hypothesis in their records