Perhaps our next Mars probe should be called the Tinkerbell. The fairy from “Peter Pan” was brought to life by children shouting, “I do believe in fairies! I do! I do!” The same chorus of belief in Martians resounds with each downpour of images and data from the apparently dead Red Planet. The photos sent home by the rovers Spirit and Opportunity have already set off a flurry of Internet chatter amongst amateur space enthusiasts. Would be astrobiologists (a new field that weds astronomy with biology) claim to see everything from fossilized coral and seashells to an admittedly creepy looking claw. The European Space Agency’s orbiting Mars Express has produced an image to fire speculation too — a grainy object that some identify as a stepped pyramid with an underground entrance.