Nasa scientists and space policy makers from around the world have been talking this week about how to send humans back to the moon.
A space policy meeting in Washington DC looked at ways to use the moon as a staging platform for testing new commercial, civil and defence systems as well as mining its valuable resources.
Nasa hopes to return to the moon in the next few years.
Harry Horton was at the meeting and sent this report.
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"One small step for man, one giant leap for mankind"
It was Neil Armstrong's famous words in 1969 that inspired dreams of further space travel.
But in the decades since, trips to the moon stopped.
Now, President Trump wants to see Nasa return to the moon.
In December, he announced a new space policy directive.
<<TAKE SOT: PRESIDENT DONALD TRUMP (Speaking in December 2017)>>
"The directive I'm signing today will refocus America's space program on human exploration and discovery. It marks an important step in returning American astronauts to the moon for the first time since 1972 for long-term exploration and use. This time, we will not only plant our flag and leave our footprint, we will establish a foundation for an eventual mission to Mars. And perhaps, someday, to many worlds beyond."
Half of Nasa's new budget is designated for space exploration.
If Nasa is to send astronauts to the moon again then the people meeting in Washington DC this week will probably have some involvement.
The American and European Scientists here say only a fraction of the moon's surface has been explored - and robots and telescopes can only learn so much.
Here's Professor Carle Pieters, a Moon Geologist from Brown University.
<<TAKE SOT: Professor Carlé Pieters, Moon geologist, Brown University>>
"We can say, ok, here's something I want to do on the moon and we can design an instrument to do that, but - and this has been demonstrated with apollo over and over again - having a human on the moon finds new things that you didn't design for."
(UPSOT: "strolling on the moon one day…")
Harrison Schmitt singing on the moon's surface in 1972.
Today he's inspiring a new generation to dream about space exploration.
The last living human to visit the moon believes it's America who must lead the way in a crowded international space field - with an increasingly active China.
<<TAKE SOT: Harrison Schmitt, Apollo 17 Astronaut>>
"It's primarily important for the United States and the free world that Nasa return to the moon because of the international competition in space. The forces of freedom need to be there and be competitive."
"Do you think the world can get excited again about another mission to the moon?"
"Oh there's no question about it. The world's going to get excited. Any time human beings are taking huge risks, managing those risks and doing exciting things."
Private companies such as Space X have opened up space travel and Nasa plans to work with them and other countries in future.
45 years since Apollo 17 left the moon - Nasa hope they can send humans there again within the next decade.
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