- Mysterious red 'cap' on Pluto's moon could be 'sticky organic residue' Yahoo News Australia
- Pluto's Moon Has a Mysterious Red North Pole, And We May Finally Know Why ScienceAlert
- Scientists Identify a Possible Source for Red Cap on Pluto's Largest Moon Charon SciTechDaily
- Charon's Red Cap at its North Pole? We Might Have an Answer Universe Today
- Mystery of `red cap` on Pluto`s moon finally solved WION
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