Trivia

Hard

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

Y
H
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

What Purpose Does The Penny Aboard NASA’s Curiosity Rover Serve?

Trivia

Easy

Which Film Does George Lucas Wish To Smash With A Sledgehammer?

Trivia

Hard

According To The USDA, A Sandwich Is Defined By The Presence Of?

Trivia

Easy

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Trivia

Hard

The Colors Of The Rainbow Were Identified And Set As They Are Now By?

Trivia

Hard

What Was The First Video Game Played In Space?

Trivia

Hard

Which Soda Company Briefly Owned A Sizable Naval Fleet?

Trivia

Easy

Which Country Has The Highest Rate Of Cremation?

Trivia

Hard

Which Of These Mammals Has Fingerprints Virtually Indistinguishable From A Human’s?

Trivia

Hard

Airport Code For The Airport Closest To Oracle’s World Headquarters Is?