Or this one:
And there's more footage here. What this means is that anyone leaving on a mission to Mars right now would have to be cool with the possibility of traveling across the solar system just to end up splattered on some rocks, which we're pretty sure was the plot of the movie Red Planet.
Meanwhile, the Mars One guys (the ones who wanna shoot a reality show on Mars) think they can avoid becoming ground sausage by using jets to slow them down instead of parachutes, but that would require a lot of fuel. Fuel has weight, and you don't have to be a physicist/TV producer to know that heavier things require more power to move. So the more fuel they need, the more, uh, fuel they need. Infinity fuel may be a difficult resource to scrounge up. Plus, if we keep making the ship bigger to carry more fuel and adding more fuel to move the bigger ship, we'd eventually end up with a Death Star.
Fine, a Borg Cube, then.