Trivia

Hard

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

H
J
X
Y

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

Rather Than Buy Locally, It’s Cheaper To Fly Roundtrip From Australia To The US For What?

Trivia

Easy

Which Of These North American Mammals Has A Sophisticated Language System?

Trivia

Hard

The 1904 Olympic Gold Medal Winner In Marathon Running Won With Help From?

Trivia

Hard

Which TV Show Was Originally Pitched As “Wagon Train to the Stars”?

Trivia

Hard

The Iconic Coca-Cola Bottle Derives Its Shape From?

Trivia

Hard

The Underside Of Nuclear Bombers Are Traditionally Painted What Color?

Trivia

Hard

Which Operating System Bestows Animal Code Names On All Releases?

Trivia

Very Hard

NASA Modeled The Apollo Re-entry Modules After What Naturally Occurring Shape?

Trivia

Hard

The City Of Glasgow Spends $15,000 A Year Keeping What Off Their Most Famous Statue?

Trivia

Hard

Which Herbivore Stalks Its Food Against The Wind Like A Carnivore?