Classic SF Featuring Planets With Very Long or Very Short Days

Earth is blessed with a day neither of extraordinary length nor of extreme brevity. Currently it is about twenty-four hours long. A quick glance at planets like Mercury and Venus shows us that worlds can have days much longer than Earth’s; bodies like Haumea suggest that days could be much shorter.

SF authors have notice this and written books about planets/planetesimals with different day lengths. Consider these five vintage works.

 

Mission of Gravity by Hal Clement (1953)

61 Cygni’s world Mesklin is sixteen times more massive than Jupiter. A day less than twenty minutes long means that the gravity at the equator is a measly three gravities. Thus, human starfarer Charles Lackland is able to briefly set down near the equator, where he is subjected to extreme discomfort (rather than immediate death). Too bad for Lackland that the object of his quest, a lost probe, is near one of Mesklin’s

Read More