#2828: Exoplanet Observation
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Transcript
[Cueball is holding a stick and pointing at a slide with two ghosts and a planet. The slide has unreadable scribbles of text and arrows pointing from the two ghosts toward the planet.]
Cueball: When the planet passed in front of its host star, some of the light was absorbed by ghosts, indicating that the planet is likely haunted.
[Caption below the panel]
Exoplanet Spectral Analysis
(Sourced from explainxkcd.com)
Title text:NASA prefers to say that their rovers are 'looking for signs of past life on Mars' and not 'ghost hunting.'