On this day in space! Oct. 13, 1773: Astronomer Charles Messier discovers the Whirlpool Galaxy before we ever knew it was a galaxy

On Oct. 13, 1773, a French astronomer named Charles Messier discovered the ” Whirlpool Galaxy,” also known as Messier 51, or M51. Charles Messier was scanning the sky for objects that could confuse comet hunters when he catalogued the galaxy as M51. However, Messier wasn’t able to see the spiral structure, and he didn’t identifyContinue Reading

The High Cost of El-Sayed

Under “Money Out of Politics,” for example, he lists his support for terrible ideas such as abolishing Immigration and Customs Enforcement and setting up a structure to bring waves of immigrants more quickly to the United States…Continue Reading

air-tahiti-all-first-class-atr-72-begins-epic-6-day,-9-airport-journey-from-france-to-tahiti

The newest ATR 72-600 for Air Tahiti is embarking on an extraordinary six-day journey from France to French Polynesia, covering approximately 14,455 miles (23,263 km) and visiting nine airports along the way. Registered F-OPFO, the aircraft is no ordinary regional turboprop, featuring an exclusive 26-seat, all-business-class cabin designed for wealthyContinue Reading

practical-gate-driver-considerations-for-modern-switches

Modern insulated gate semiconductor switches such as Si- and SiC-MOSFETs and Si-IGBTs are far easier to use than the bipolar junction transistors and GTO (Gate Turn-Off) thyristors of decades past. A primary reason is that they are all controlled by a voltage applied to a control terminal—the gate—that looks likeContinue Reading