What's about all those Sherlock Holmes regalia on the Perseverance Mars Rover?

Is Sherlock Holmes currently fashion or what's the reason for all those relics about him placed on the Mars Perseverance Rover for kids to find? I don't get it. Is there an alien murder mystery to solve on that planet?

The Mars rover Perseverance is packed with hidden messages. Can you find them?
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From the Sherlock Holmes Wikipedia article [link to en.wikipedia.org (secure)]

Sherlock Holmes is a fictional private detective
[...]
Referring to himself as a "consulting detective" in the stories
[...]
Holmes displays a strong aptitude for acting and disguise.
[...]
Watson describes Holmes as "bohemian" in his habits and lifestyle.
[...]
He sometimes used morphine and sometimes cocaine, [...] both drugs were legal in 19th-century England.