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.

We have to deal with issues like inequality, we have deal with issues of economic dislocation, we have to deal with peoples fears that their children won't do as well as they have. The more aggressively and effectively we deal with those issues, the less those fears may channel themselves into counter-productive approaches that pit people against each other.

Even as we implement the nuclear deal and welcome our Americans home, we recognize that there remain about differences between the United States and Iran. We remain steadfast in opposing Iran's destabilizing behavior elsewhere, including its against Israel and our Gulf partners and its support for violent proxies in places like Syria and Yemen.

Sanctions alone could not stop Iran's nuclear program. But they did help bring Iran to the negotiating table.

The Internet and Twitter and all these things are very powerful, but it also means sometimes that instead of having a dialogue we just start calling folks - calling each other names. And that's true on the left or the right.

So I'm not proposing anything radical. I just believe that anybody making over $250,000 a year should go back to the income tax rates we were paying under Bill Clinton. Back when our economy created nearly 23 million new jobs, the biggest budget surplus in history, and plenty of millionaires to boot. ... At the same time, most people agree that we should not raise taxes on middle-class families or small businesses -- not when so many folks are just trying to get by.

We're showing that there's no excuse for other nations to come together, both developed and developing, to achieve a strong global climate agreement next year.