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Parker Solar Probe: fastest object ever built, at 430,000 mph

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Parker Solar Probe: fastest object ever built, at 430,000 mph

NASA's Parker Solar Probe set its current speed record for a human-made object in 2024, and has matched it on every close pass since.

Verified · NASA Science

NASA’s Parker Solar Probe is the fastest object humans have ever built. It reached about 430,000 miles per hour on December 24, 2024, passing just 3.8 million miles above the Sun’s surface, the closest any spacecraft has come to a star. At that speed it could cross the continental United States in under half a minute.

The record comes with a qualifier: the speed is measured relative to the Sun. Parker is not pushed by engines. It is falling toward the most massive object in the solar system, and it reached its tight orbit gradually, using seven flybys of Venus over six years. The record grew in steps:

  • April 1976: the German-American Helios 2 probe set the previous record for a human-made object.
  • October 29, 2018: Parker passed 153,454 mph and took the title.
  • December 24, 2024: its closest approach pushed the record to about 430,000 mph, nearly three times as fast.
  • September 4, 2026: the 29th close pass again hit 430,000 mph at 3.8 million miles, as every pass since 2024 has.

How close is 3.8 million miles?

NASA’s comparison: shrink the Sun–Earth distance to the length of a football field and Parker would be about four yards from the end zone, inside the Sun’s outer atmosphere, the corona.

Surviving there depends on a carbon-foam heat shield designed to tolerate 2,600°F. Operators expected it to face about 1,800°F at closest approach while the instruments behind it stayed near room temperature. After the 2024 pass, a beacon tone on December 26 confirmed the spacecraft had come through intact.

430k mph
top speed
3.8M mi
from the Sun
2018
broke Helios 2 record

Sources & references

5 references

Well-established. Corroborated by 2 independent sources.

1 NASA Science Space agency Breaking its previous record by flying just 3.8 million miles above the surface of the Sun, NASA’s Parker Solar Probe hurtled through the solar atmosphere at a blazing 430,000 miles per hour — faster than any human-made object has ever moved. science.nasa.gov ↗
2 NASA Science Space agency If the solar system was scaled down with the distance between the Sun and Earth the length of a football field, Parker Solar Probe would be just four yards from the end zone — close enough to pass within the tenuous outer atmosphere of the Sun known as the corona. science.nasa.gov ↗
3 NASA Science Space agency At about 10:54 p.m. EDT, Parker Solar Probe surpassed 153,454 miles per hour — as calculated by the mission team — making it the fastest-ever human-made object relative to the Sun. This breaks the record set by the German-American Helios 2 mission in April 1976. science.nasa.gov ↗
4 NASA Science Space agency NASA’s Parker Solar Probe completed its 29th close approach to the Sun on Sept. 4, again matching its record speed and distance from the solar surface. science.nasa.gov ↗
5 Johns Hopkins Applied Physics Laboratory Research institution The shield was designed to reach temperatures of 2,600 degrees Fahrenheit (around 1,430 degrees Celsius) — hot enough to melt steel — while keeping the instruments behind it shaded at a comfortable room temperature. Spacecraft operators expect the shield to have faced temperatures around 1,800 F (980 C) at closest approach. jhuapl.edu ↗
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