Sorry, y'all. SpaceX isn't going to Mars in 2018

In April 2016, SpaceX made the bold proclamation that it will send a robotic mission to Mars by 2018. 
Today, the Elon Musk-founded company is singing a different tune. 
Instead of aiming for the 2018 deadline, SpaceX will now try to launch a robotic mission to Mars — known as its Red Dragon mission — two years later, in 2020, SpaceX president Gwynne Shotwell said during a press conference Friday. 
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