On the day of the 2016 election here in the United States, the prediction gurus at FiveThirtyEight gave Hillary Clinton a 71.4 percent chance of becoming the next president. The New York Times was more optimistic, at 85 percent.

If elections were a merely a matter of statistical probability, one way to envision those odds is picturing four poker chips in a pouch: three blues for Clinton, and one red for Trump. On November 8, America reached inside, and against the odds, pulled out the red chip.

As we've seen throughout our Horizon Goal series , presidential transitions can be a time of great uncertainty for government agencies, including NASA. This would have been the case for both Clinton and Trump, but whereas Clinton represented the status quo, Donald Trump has vowed to upend it.

The president-elect tends to defy analysis; nevertheless, in this, our sixth and final Horizon Goal segment, we'll try to unpack the next four years of NASA's human spaceflight program.

Will the Trump administration keep the agency on course for sending humans to Mars in the 2030s? Are changes coming for the way for the cornerstone vehicles of those plans, the Space Launch System rocket and Orion crew capsule? And how will NASA set up shop beyond low-Earth orbit for the first time since 1972?