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### Theory:

National Aeronautics and Space Administration (NASA) is the most well-known space agency established on $$October\ 1,\ 1958$$, with headquarters in Washington DC. It has ten field centres that play an important role in carrying out NASA's mission.

NASA

NASA is a supporter of the International Space Station (ISS), an international space exploration collaboration. The space agency has sent rovers to Mars, studied Jupiter's atmosphere, and investigated Saturn and Mercury.

ISS

NASA learned more about space flight through the Mercury, Gemini, and Apollo programs. All the planets in the solar system have been visited by NASA's robotic space probes. NASA's satellites have uncovered many data about the Earth, resulting in useful knowledge on its weather patterns. From smoke alarms to medical tests, NASA's technology has helped to create significant products used in daily life.
Apollo Missions:
The most well-known NASA missions are the Apollo missions since they made the American astronauts walk on the Moon. There are $$17$$ missions totally out of which Apollo-8 and Apollo-11 are particularly noteworthy.

Apollo mission

The first manned mission to the Moon was Apollo-8, which returned to Earth after orbiting the Moon. The first 'Man Landing Mission' to the moon was Apollo-11.
Landing on the Moon:
Neil Armstrong, an American astronaut, was the first person to set foot on the Moon on $$July\ 21,\ 1969$$ on Apollo-11 mission. It was the first ‘Man Landing Mission’ to the moon. Neil Armstrong was the first man to walk on the surface of the Moon, followed by Edwin Aldrin.

Neil Armstrong walking on Moon

Footprint of Neil Armstrong

The members of the crew were Neil Armstrong, Edwin Aldrin, and Michael Collins.

From left: Neil Armstrong, Edwin Aldrin, and Michael Collins
"That's one small step for a man, one giant leap for mankind" - Neil Armstrong
NASA's work with ISRO:
NASA and ISRO have agreed to collaborate on the launch of the NISAR satellite (NASA-ISRO Synthetic Aperture Radar) and Mars Exploration Missions.

NISAR satellite
Reference:
https://cdn.pixabay.com/photo/2016/09/02/22/58/nasa-1640510_960_720.jpg
https://cdn.pixabay.com/photo/2012/11/28/10/36/international-space-station-67647_1280.jpg
https://cdn.pixabay.com/photo/2012/10/10/05/06/moon-landing-60543__340.jpg
https://live.staticflickr.com/7831/46713054544_1e8b27fdfe_b.jpg
https://commons.wikimedia.org/wiki/Help:Public_domain