Getting To Orbit And The Rocket Equation

The Apollo 12 mission recently celebrated its 50th anniversary. Launching on November 14, 1969 and returning on November 24, it put humans on the Moon for the second time. I wrote about Apollo 11 (mostly about its guidance computer) earlier in the year in my post The First Computer on the Moon. Today's post is about the rocket equation, and how challenging it is to get into orbit around th... » read more