#2978: Stranded
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[Two astronauts, Megan and Cueball, are shown floating in the cabin of a space station, Megan near the top and Cueball near the bottom. Various miscellaneous devices and features are visible, all across the inner walls of the space station, as well as a large round window through which they can see some of the Earth's surface. Three white shapes are visible that could represent landmasses in a large body of water, bodies of water in/around a landmass or possibly weather systems.]
Megan: Until they get another rocket ready to launch, 8 billion people are stranded down there.
(Sourced from explainxkcd.com)
Title text:At least they're not alone down there.