Trivia

Hard

Which Letter Appears Once a Year on the Moon’s Surface?

Y
X
J
H

Answer: X

The human mind is a pattern seeking one.  We humans are quite good at turning abstract shapes into familiar ones.  One of the most famous astronomical examples of this is the Man in the Moon–from our terrestrial vantage point the craters on the Moon’s surface look like a man’s face looking down on us.

If you look even closer at the Moon, however, you will find a much tinier surface feature just waiting for us to visualize a symbol over it.  For a scarce four hours at the beginning of the first quarter, the horizon of the Moon is illuminated by the Sun in just such a way that the walls of the lunar craters La Caille, Banchinus, and Purbach cast shadows that create the illusion of a giant X on the surface of the Moon. This formation is known as the Purbach Cross (thanks to the related crater) or the Werner X (named so after the Werner crater, a sizable landmark just south of the X formation).

Bonus Trivia: Formations like the Purbach Cross are known as clair-obscur formations, or light-dark formations, created by extreme contrast between natural light (in this case the sun) and darkness (the deep darkness of the dark side of the Moon and the Moon’s craters).

Trivia

Hard

Which Actor Portrayed A Comic Hero That Was Modeled Directly After Himself?

Trivia

Hard

What Popular Pet Was The Result Of Pollution-Oriented Experiments?

Trivia

Easy

If You Have A Lichtenberg Scar You’ve Been?

Trivia

Very Hard

Before The Term Coffin Came To Be Synonymous With Burial Casket, It Referred To?

Trivia

Very Hard

The Name Of The Most Popular Supercomputer Job Scheduler In The World Is A Nod To?

Trivia

Hard

“Dragon King” Is An Actual Title, And The King Rules Over?

Trivia

Easy

The British Tradition Of Driving On The Left Side Of The Road Is Thanks To?

Trivia

Easy

What Was The First Commercial USB Flash Drive Called?

Trivia

Easy

Modern Subway Maps Were Inspired By?