89K views · 3.5K reactions | Yesterday, we put NASA’s Orion Spacecraft's propulsion system to the test! Watch the auxiliary and main engines fire up , simulating a challenging mission scenario: boosting Orion into a temporary orbit. This test helps ensure the safety of astronauts on #Artemis missions to the Moon: https://go.nasa.gov/2yJl0mA | NASA - National Aeronautics and Space Administration | Facebook

The history of UFO sightings in North America goes back nearly 80 years. Explore the timeline of some of the most famous sightings and listen to testimonials from witnesses and the experts who dedicate their careers into uncovering the mysteries behind them. Solve the unknown in the brand new series, UFOs: Investigating The Unknown, Tuesdays at 8pm on National Geographic UK. | National Geographic UK

For decades, the existence of UFOs was denied by the U.S. Government even after unidentified phenomena were spotted above the U.S. Capitol in July of 1952. Over half a century later - on April 27th, 2020 - the Pentagon acknowledged the existence of Unidentified Aerial Phenomena as captured in footage that was brought to light by a team of experts and researchers. Don't miss the return of the groundbreaking series that started it all when #Unidentified returns July 11th at 10/9c on HISTORY. | HIS