Answer:
HowStuffWorks (article): NASA's Helios 2 probe came within 27 million miles (43.5 million kilometers) of the surface of the sun in 1976.
futurism (article): Its approach brought it within 15 million miles — far closer than the planet Mercury — from the Sun's surface, traveling at 213,200 miles per hour, which is the fastest any man-made spacecraft has ever traveled.
Step-by-step explanation:
well, there are a bunch of approximations out there. take a look at the two above.