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1

It's hard to guess what is in the mind of another contributor, but... Using a cycler model could involve a network of space ports, and the cycler would take the role of a "midway" space station (it taking care for the cargo for the portion of the journey between Earth and Mars) In Earth orbit, there would be a staging post or spaceport. Launch vehicles ...


9

You're right: this has issues. You can insert a station into a circular orbit halfway between Earth and Mars, but because this has an orbital period also in between those of Earth and Mars, your station won't be in a usable position most of the time. So you'd have to fill the orbit with several station to always have one reasonably close. The fuel is also ...


3

That is how it is commonly used. If you were in a parking orbit around Mars, it is imaginable that the burn that brought you on the transfer back to earth wold be called a TEI. The TEI from Apollo is also a deceleration wrt. to Earth, just like a TEI from Mars would be a deceleration wrt. the Sun. In 2004, from outside the Earth-Moon system, the Stardust ...


2

They were only in orbit for a few years each in the 1960s, and thus fail the "currently" test, but the Echo1 and Echo2 satellites deserve some mention. https://en.wikipedia.org/wiki/Project_Echo Basically aluminized Mylar balloons, Echo1 had a volume of $14,800 \text{ m}^3$, while Echo2 topped out at $36,000 \text{ m}^3$ Echo2 was actually test-inflated ...


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Initial and Bonus Answer: With a volume of 609.31 M^3 and an empty mass of 15,500kg (13,500 kg empty weight plus 2,000kg for the attached Instrument Unit), J002E3 is Apollo 12's S-IVB stage (designated S-IVB-507). It was intended to be placed in a heliocentric orbit following Apollo 12's TLI Burn. Due to insufficient propellant, however, it ended up ...


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Answer for Bonus question Not entirely sure if indeed the biggest (in heliocentric orbit), but bigger than roadster for sure: S-IVB, the third stage of Saturn V rocket that was used for Apollo lunar missions (height 17.81m, diameter 6.6m) https://en.wikipedia.org/wiki/S-IVB There are few of them in heliocentric orbit. https://en.wikipedia.org/wiki/...


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I would say it's probably Envisat. It is definitely the heaviest although i'm not sure if it is also the largest piece volumetrically. We had a full scale 'mock up' at our faculty and I can confirm that it is absolutely massive! They have been thinking about ways to deorbit it for quite a while now since a collision involving this large of a satellite could ...


1

If you think about it, the Earth is at the same distance from the Moon that the Moon from the Earth (of course), so the Earth at the lunar surface should be 4 times bigger in appearence.


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