The Parker Solar Probe is a NASA space probe launched in 2018 with the mission of making observations of the outer corona of the Sun. It will approach to within 9.86 solar radii from the center of the Sun, and by 2025 will travel, at closest approach, as fast as 690,000 km/h, or 0.064% the speed of light. NASA's Parker Solar Probe is on a mission to "touch the Sun." The spacecraft is flying closer to the Sun's surface than any spacecraft before it. The mission will revolutionize our understanding of the Sun. Parker will fly more than seven times closer to the Sun than any spacecraft. The Solar Probe Cup's data shows that the Parker Solar Probe dipped into the corona three times on April 28, at one point staying in the outer atmosphere for approximately five hours. To resist the sun's intense temperatures, the device is made of heat-tolerant chemicals like tungsten, niobium, molybdenum and sapphire. The thermal Protection System (TPS) is 8 feet (2.4 meters) in diameter and 4.5 inches (115 millimeters) thick to protect Parker Solar Probe from the intense heat generated by the Sun. Even though the shield provides just a few inches of protection, this allows the spacecraft to maintain a temperature of 85 F (30 C). NASA's Parker Solar Probe has survived a four years journey and a 2 million degree Fahrenheit environment. The RL10 second stage engine helped send the Parker Solar Probe, developed by the Johns Hopkins University Applied Physics Laboratory, into a heliocentric orbit that ultimately will take it around the Sun 24 times. According to project scientist Nicky Fox, the team describe it as "the most autonomous spacecraft that has ever flown". The primary power for the mission is a dual system of solar panels (photovoltaic arrays). The spacecraft that is traveling the fastest is NASA's Parker Solar Probe. After it launched from Earth in 2018, it skimmed the Sun's scorching atmosphere and used the Sun's gravity to reach 330,000 mph (535,000 km/h). The cost of the project is US$1.5 billion. Johns Hopkins University Applied Physics Laboratory designed and built the spacecraft, which was launched on 12 August 2018.

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