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1

I like to play with the notion of cyclers. One type of cyclers is a circular orbit crossing an elliptical orbit, both with the same period. On this comic book page the Cheng Ho is such a cycler. The geometry of orbits about the sun and around the earth are the same so I'll leave the labels at A.U. and years. Here for simplicity's sake I set both the semi ...


10

If your jump is perfectly nadir pointing, and all perturbing forces are neglected so we can consider both your orbit and the ISS orbit as perfect two-body orbits, you will meet again after one full orbit, as a low-velocity impulse that is perfectly radial does not affect the orbital period. From your perspective, relative to the ISS, you will move downward ...


9

NASA has helpfully provided a list of spacecraft classifications which covers these terms (and more.) Rover: a vehicle. There have been 4 rovers on Mars: Sojourner, Spirit, Opportunity and Curiosity. Lander: any spacecraft that can land safely. Lander spacecraft are designed to reach the surface of a planet and survive long enough to telemeter data ...


4

The reason you go with UDMH/NTO F/O pair is storability, i.e. the ability of your rocket or missile to be stored, fully fueled straight from the factory, in a silo or stand on a launch rack for an extended amount of time, possibly years or even decades, and ready to use at a moment's notice, and spontaneous combustion upon contact with no ignition, meaning ...


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