Where did Mercury get its water ice? Maybe from a slow asteroid impact in a single Mercurian day - Space

Where did Mercury get its water ice? Maybe from a slow asteroid impact in a single Mercurian day    Space Mercury's water ice may have been deposited by a larger, slower impactor than previously thought—in only one day    Phys.org Astronomer’s Notebook: Mercury, the elusive innermost planet    Delco Times Mercury may have gained all of its unexpected water in a single day    New Scientist Water ice on Mercury could have formed in a single day    Universe Space Tech

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