#2524: Comet Visitor
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[Megan sits at a desk in front of a computer, looking to the left off-panel and pointing at the screen]
Megan: Have you seen this big comet, C/2014 UN271?
Megan: It'll pass near Saturn's orbit in 10 years.
[In a frameless panel, Cueball stands behind Megan, who is now looking at the computer and typing]
Cueball: Wow, look at the orbital period.
Megan: Yeah, it hasn't been to this part of the solar system since humans evolved.
Megan: At least.
[Cueball starts running off-panel, holding his finger in the air. Megan looks towards him with both arms resting on the back of her chair]
Cueball: Well, we definitely need to tidy up. I'll start on the Pacific Garbage Patch, you tackle orbital debris.
Megan: What about the moon footprints?
Cueball: Sweep them up. Collect the Mars rovers, too!
Cueball: We can put them back once it's gone.
(Sourced from explainxkcd.com)
Title text:It's a myth that the Great Wall of China is the only human-made structure visible from space--there are LOTS of structures for us to feel self-conscious about!