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The International Space Station (ISS) is the largest artificial object ever placed in space. It is a large, habitable spacecraft that orbits the Earth at an altitude of around 400 kilometers (about 250 miles). The ISS is a joint project involving NASA (United States), Roscosmos (Russia), ESA (Europe), JAXA (Japan), and CSA (Canada). Construction of the station began in 1998, and it has been continuously inhabited by astronauts since November 2000.
The ISS is roughly the size of a football field, measuring about 109 meters (356 feet) end to end, making it easily visible from Earth to the naked eye when it passes overhead. It consists of multiple interconnected modules used for living quarters, laboratories, and solar arrays that provide power to the station. It travels around the planet at a speed of about 28,000 kilometers per hour (17,500 mph), completing an orbit approximately every 90 minutes.
The main purpose of the ISS is scientific research and space exploration testing. Scientists aboard the station conduct experiments in microgravity, study the effects of space on the human body, test new technologies, and research topics in biology, physics, astronomy, and earth science. The ISS also serves as a stepping stone for future missions to the Moon and Mars.
The other options listed in the question are not correct:
An AI-powered robot is not a space structure but a technology used in robotics.
A parabolic aircraft is used on Earth to simulate weightlessness for astronaut training but does not stay in space.
"None of the above" is incorrect because the ISS is the recognized largest man-made structure orbiting Earth.
Thus, the correct answer is ISS (International Space Station), a symbol of global cooperation and the biggest artificial satellite ever built.
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