People first set foot on the moon on July 20, 1969. Astronauts Neil Armstrong and Buzz Aldrin stepped from the Apollo 11 spacecraft. They planted an American flag on the moon’s surface. After that, NASA sent six more missions to the moon. Then the United States government stopped funding them. NASA hasn’t sent a crew to the moon since 1972.
Now the space agency is planning a return trip. In December 2017, President Donald Trump signed a Space Policy Directive. It put lunar
                                
                                    
                                    
                                
                                
								
									lunar
                                    
                                    NEIL ARMSTRONG—NASA
                                    
										relating to the moon
										(adjective)
                                    
                                    Astronaut Neil Armstrong returned to Earth with several lunar rocks. 
                                
                             exploration back at the top of NASA’s agenda.

GIANT LEAP Astronaut Buzz Aldrin poses for a photo on the moon, on July 20, 1969.
NASA
NASA wants to change the way astronauts explore the moon. The Apollo 11 crew spent 21 hours, 36 minutes there. Future astronauts could spend up to six weeks at a time orbiting
                                
                                    
                                    
                                
                                
								
									orbit
                                    
                                    CARLOS CLARIVAN—SCIENCE PHOTO LIBRARY/GETTY IMAGES
                                    
										to travel around something
										(noun)
                                    
                                    Many satellites orbit the Earth. 
                                
                             the moon and visiting its surface. This will be made possible by the Lunar Orbital Platform-Gateway.
Gateway will be a sort of mini space station. It will be much smaller than the International Space Station. Gateway will have five modules, or interlocking parts. One or two of them will house astronauts. Another will provide solar electric power. Others will serve as an air lock for spacewalking astronauts and a docking port for vehicles. Astronauts will travel to the moon’s surface and back in a small craft.
NASA plans to use unmanned
                                
                                    
                                    
                                
                                
								
									unmanned
                                    
                                    CHOMBOSAN/ISTOCK/GETTY IMAGES
                                    
										not operated or completed by a person
										(adjective)
                                    
                                    There is new technology to have an unmanned taxi drive pick you up!
                                
                             rockets to send parts for Gateway into lunar orbit. “We’re working to have astronauts on the moon by the mid-2020s,” says Bill Gerstenmaier. He is a NASA administrator for human exploration and operations.

THINK BIG President Trump holds a toy moonwalker during the signing of a directive that put moon exploration back on NASA’s agenda.
SAUL LOEB—AFP/GETTY IMAGESAll Aboard
Gateway will allow astronauts to explore more of the moon than Apollo could. Apollo flew a circular path around the moon. It stayed about 60 miles away. It could land only near the moon’s equator
                                
                                    
                                    
                                
                                
								
									equator
                                    
                                    REBECCA YALE/GETTY IMAGES
                                    
										an imaginary circle the same distance from the North Pole and South Pole in the middle of the Earth
										(noun)
                                    
                                    Most howler monkeys lives in rain forests along the equator. 
                                
                            . Gateway will travel an egg-shaped orbit. It will fly between 1,200 and 47,000 miles away. Astronauts will pick their landing spot. They’ll adjust Gateway’s orbit to fly over that spot. Then they’ll take the landing vehicle down.
Other countries may pitch in. Russia may build the air-lock module. Japan might provide a module that will assist with propulsion
                                
                                    
                                    
                                
                                
								
									propulsion
                                    
                                    PAUL BRADBURY/GETTY IMAGES
                                    
										the action that pushes something forward
										(noun)
                                    
                                    Swimmers kick their feet underwater as a means of propulsion. 
                                
                             and communications. Canada could build a robotic arm for outdoor work on Gateway.
The U.S. Congress will have to get on board too. It’s up to them to provide money to build Gateway. In 1962, President John F. Kennedy encouraged Americans to support the space program. He said in a speech, “We choose to go to the moon.” The most powerful word in that line was choose. We chose then. We can choose again. It’s entirely up to us.

Mars
NASAOn Deck: Mars
NASA sees Gateway as a base for staging missions beyond the moon. What’s the next stop? Mars. The space agency plans to build a special craft for the trip. The Deep Space Transport will carry astronauts from Gateway to the Red Planet and back. This will reduce the cost of shuttling supplies for a Mars mission all the way from Earth. The Mars transport could even expand its size by attaching one of Gateway’s habitat modules.
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