CONTEST: KENTUCKY DERBY HORSE OR GEOLOGICAL FORMATION ON MARS?

Here’s a contest you can play with listeners, or just amongst yourselves. Which of these is a horse running in the Kentucky Derby this coming Saturday, and which is a geological formation found on the planet Mars?
– Known Agenda (horse)
– Like the King (horse)
– Ghost Dune (Mars rock formation)
– Brooklyn Strong (horse)
– Keepmeinmind (horse)
– Tharsis Rise (Mars volcano)
– O Besos (horse)
– Mandaloun (horse)
– Olympus Mons (Mars volcano)
– Medina Spirit (horse)
– Big Joe (Mars rock)
– Barnacle Bill (Mars rock)
– Hot Rod Charlie (horse)
– Midnight Bourbon (horse)
– Dynamic One (horse)
– Face on Mars (Mars rock that looks like a face)
– Home Plate (Mars rock that looks like, uh, home plate)
– Rock Your World (horse)
– Little Flat Top (Mars rock)
– Hidden Stash (horse)
– Mount Sharp (Mars volcano)
– King Fury (horse)
– Super Stock (horse)
– Blueberries (Mars field of hematite stones)
– Soup and Sandwich (horse)
– Medusae Fossae (Mars rock formations)