@jachayw: I voted for Mariner 10, mainly because I find Venus one of the more interesting planets in the solar system. There is this hypothetical NASA proposal to make floating airship cities as a colony. If you put it 50 km in the air, it becomes the most earthlike conditions in the system. I also have a soft spot for Galileo, because my Space Mission Project was on Jupiter.

@Nadh: Voyager 1 is the farthest man-made object drifting away in space. The least we can do is vote on it :)

@Tino_Z: donate yall

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@Tino_Z: https://teamtrees.org/

@FireFox87623: I want to say NASA and SpaceX 

@jachayw: NASA will. 

@nakedeye: agree.. both had different perspectives. tesla owns both s/w & hardware where as Nikola had hardware alone leaving s/w aspect to any other vendor like open s/w.  and also specs relating to Nikola tre are little more impressive compared to Tesla and usage of hydrogen using electrolysis is impressive. I wish the storage technologies from tesla/nikola are shared to mass helping in having green energy and these matters alot for future.

@Nadh: I'm sure Nikola Tesla would be proud of both Nikola and Tesla. 
At the moment Tesla is a light-year ahead of Nikola. It has proven many times that it can deliver. Nikola still has a long way to go. And I think it's going to be hard to catch up to Tesla let alone beat it.