Trivia

Hard

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

Y
H
X
J

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

There Is A Species Of Moth That Has Adapted To Living Entirely On What?

Trivia

Easy

Mark Hamill Auditioned For Luke Skywalker At The Behest Of The Actor Behind Which Horror Movie Character?

Trivia

Easy

Stomach Ulcers Are Caused By?

Trivia

Hard

At The Turn Of The 17th Century The Most Popular Drink In Britain Was?

Trivia

Very Hard

Which Of The Following Medical Conditions Makes You More Attractive To Mosquitoes?

Trivia

Easy

Which Of The Following Lake Types Is Formed By A Meandering River?

Trivia

Hard

Who Divided The Day Into 24 Hours?

Trivia

Hard

In The Original Bram Stoker’s Tale, Dracula Isn’t Harmed By?

Trivia

Easy

Which Company Created The First Hand-Held Digital Camera?

Trivia

Hard

The Lowest Level Programming Language Is?