NASA's Parker Solar Probe has successfully survived its closest-ever flyby of the Sun, coming just 3.8 million miles from its surface.The probe transmitted a signal back to Earth, indicating that it is in good health and operating normally.The mission aims to gather data on solar wind, the Sun's heat, and the acceleration of energetic particles to near light speed.The Parker Solar Probe is equipped with a heat shield that can withstand temperatures up to 2,500 degrees Fahrenheit.