By 2025 we expect new spacecraft designed for long journeys to allow us to begin the first ever crewed missions beyond the Moon into deep space. So we'll start by sending astronauts to an asteroid for the first time in history. By the mid-2030s I believe we can send humans to orbit Mars and return them safely to Earth. And a landing on Mars will follow and I expect to be around in see it.

Reflecting on his years in prison, Nelson Mandela wrote that there were dark moments that tested his faith in humanity, but he refused to give up.

As we look forward to the New Year, let's resolve to recommit ourselves to the values we share.

When we don't pay close attention to the decisions made by our leaders, when we fail to educate ourselves about the major issues of the day, when we choose not to make our voices and opinions heard, that's when democracy breaks down. That's when power is abused. That's when the most extreme voices in our society fill the void that we leave. That's when powerful interests and their lobbyists are most able to buy access and influence in the corridors of power - because none of us are there to speak up and stop them.

As for Israel, our friendship is rooted deeply in a shared history and shared values. Our commitment to Israel's security is unshakeable. And we will stand against attempts to single it out for criticism in international forums.

I think that people are concerned about the breakdown of the family but they also don't want to see discrimination against gays and lesbians who they work with and they want to be able to make sure that gays can visit each other in hospitals and be able to inherit property.

My hope is Donald Trump makes things better. And if he does, we'll all benefit from it.