Artemis

 is a black hole badge on Khan Academy. So far its requirements are unknown. However, people are looking for clues in the HTML page source to find the requirements. A Khan Academy user, now a staff member, named Peter Collingridge knows its requirement but is not sharing any details as he feels that it would be wrong of him to reveal its secrets. His website says that it is currently impossible to earn.

Trivia

 * This is the hardest badge to earn.
 * This badge gives the most number of free energy points.
 * It is impossible to earn this badge currently.

Named After
This badge was named after Artemis, a Greek goddess. She was the great Olympian goddess of hunting, wilderness and wild animals. She was also a goddess of childbirth, and the protectress of the girl up to the age of marriage.