<ul><li>NASA's space activities have led to significant milestones, including humans landing on the Moon in 1969 and sending spacecrafts to explore other planets in the solar system.</li><li>One of NASA's major achievements is the establishment of the International Space Station (ISS), a joint project with space centers from Russia, Japan, Canada, and Europe. The ISS orbits the Earth at a height of approximately 400 km, completing one revolution every 90 minutes.</li><li>The ISS, which has been in operation for the past 20 years, is larger than a football field and serves as a hub for scientific research. Scientists from around the world visit and stay on the ISS for extended periods, conducting experiments in its unique, gravity-free environment.</li><li>The space shuttles are used to transport astronauts to and from the ISS, enabling more than 250 scientists to benefit from its research facilities and conditions.</li></ul>

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