Trivia

Hard

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

H
Y
J
X

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

The Comet Lovejoy Is Notable For Leaving A Trail Of?

Trivia

Very Hard

The Highest Grossing World War II Film Of All Time Is?

Trivia

Hard

The First Game Console To Feature A Built-In Hard Drive Was The?

Trivia

Hard

Which Band Got Together Because the Members Were Running From a Gun Fight?

Trivia

Easy

Which Of These Heart Medications Got Its Start As A Rat Poison?

Trivia

Easy

The Direction Of Clock Hand Movement Was Determined By?

Trivia

Hard

What Wildly Successful Game Was Programmed By One Individual Using Assembly Language?

Trivia

Hard

The Web Site For Which 1996 Movie Has Remained Online And Untouched?

Trivia

Hard

In British Culture, An “Agony Aunt” Dispenses?

Trivia

Easy

Which Tech Company Once Consumed 100% Of The World’s CD Production Capabilities?