1) The first photograph of a black hole was captured in 2019 using a network of telescopes around the world.

2) The speed of light is approximately 299,792,458 meters per second.

3) The European Union (EU) is a supranational organization comprising 27 member states that cooperate on various issues, including trade, economic integration, and common policies, while preserving individual national sovereignty.

4) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.