Science
How to get people from Earth to Mars and safely back again – The Conversation AU
We’ve already sent probes to land on Mars. The challenge now is to get people there and bring them home again.

There are many things humanity must overcome before any return journey to Mars is launched.
The two major players are NASA and SpaceX, which work together intimately on missions to the International Space Station but have competing ideas of what a crewed Mars mission would look like.
Size matters
The biggest challenge (or constraint) is the mass of the payload (spacecraft, people, fuel, supplies etc) needed to make the journey.
We still talk about launching something into space being like launching…
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