Challenges in Mars Exploration

Now before any of you comment and try to correct the info in the video please read :
The distance between Earth and Mars constantly varies due the orbits of the planet along with the time it takes light to travel between the two planets so the numbers I used in the video are specific examples of a hypothetical situation and are accurate.

Also I heard the news about Stephen Hawking and I just wanted to say RIP (1942-2018)

Sources:
The ScienceVerse
11:07 PM (5 minutes ago)
to me
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