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If NASA is to reach beyond the Moon and someday reach Mars, it must be relieved of the burden of launching people and cargo to low earth orbit. To do that, we must invest more in commercial spaceflight.

As we visit Mars multiple times, we will build up infrastructure on the surface to expand the capabilities and reach of humans on Mars.

We achieved our mission to the moon. Let's look home from that lofty perch and reimagine our mission on Earth - that is what we need to do here. Together, we can upcycle everything. The world will be better for our positive visions and actions.

We constantly learn new lessons up here. The experiences we gather will enable us to establish a long-term station on the moon and to go on to Mars.

Let's not spend resources that we don't need to be sending astronauts back to the moon. Let's not spend expensive resources on bringing people who have reached Mars back again. Prepare them to become a growing colony.

We will build new ships to carry man forward into the universe, to gain a new foothold on the moon and to prepare for new journeys to the worlds beyond our own.

Years of science fiction have produced a mindset that it is human destiny to expand from Earth, to the Moon, to Mars, to the stars.

The space program needs a goal, and the goal should be humans to Mars.

If you want a nation to have space exploration ambitions, you've got to send humans.

Mars is key to humanity's future in space. It is the closest planet that has all the resources needed to support life and technological civilization. Its complexity uniquely demands the skills of human explorers, who will pave the way for human settlers.