On the left in the background is the same J-2 engine I showed yesterday. On the right in the foreground is the even larger F-1 rocket engine. A single engine produced 1.5 million pounds of thrust -- as much as all three space shuttle main engines combined. Five of these huge engines generated a staggering 7.5 million pounds of thrust to power the first stage of the Saturn V moon rocket. It remains the most powerful liquid fuel engine ever developed.

In other news, I'll be out of town this weekend participating in the MS150, a bike ride from Houston to Austin benefitting the National Multiple Sclerosis Society. (The photoblog will be on autopilot.) The Houston-Austin ride is the largest MS ride in the country, with 13,000 people participating this year! If you are interested in sponsoring my ride, please feel free.

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