The Apollo Jettison Anomaly

A previously classified anomaly that could have killed the Apollo 11 astronauts on re-entry has recently been revealed. It almost caused the Service Module to collide with the Command Module, and it also affected two previous flights.

A serious anomaly occurred as the crew careened toward a landing on Earth, according to Nancy Atkinson, a science journalist and author who details formerly classified information about the event in her new book, " Eight Years to the Moon: The History of the Apollo Missions."

"Through my interviews and research for the book, I uncovered a serious anomaly that occurred during Apollo 11's return to Earth," Atkinson — whose book comes out July 2 — told Business Insider in an email. "The event was discovered only after the crew had returned safely to Earth."

The problem happened just before Apollo 11 returned to Earth, causing a discarded space module to nearly crash into the crew's capsule.

What's more, Atkinson's sources suggest, the same issue also threatened the crews of three other Apollo missions.

I have not heard about this before reading the article linked here and it's made me quite interested in reading Atkinson's book.