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29. Getting to the Sun from Earth is remarkably energy intensive

Orbital mechanics are very counterintuitive, you have to get rid of virtually all of the Earth's orbital velocity in order to put something in the Sun, that's about 67,000 mph.

Orbital velocity around the Earth at 120 miles altitude is about 17,000 mph so you would need nearly four times the energy to put something in the Sun from Earth orbit than it took to get it to Earth orbit from the surface to start with.