On September 18, 1968, Western intelligence picked up a signal from Zond 5, a Soviet lunar mission. The messages were unusual. They emitted the voices of cosmonauts Valery Bykovsky, Vitaly Sevastyanov ...

In the heart of the Cold War, a Soviet probe sent back images of Venus that had never before been seen by human eyes. These rare photographs, which lay dormant in archives for decades, have now been ...

Here’s what you’ll learn when you read this story: Object Arjuna 2025 PN7 was thought to be a meteorite in an Earthlike orbit, but that is now being questioned. The new hypothesis suggests that 2025 ...