Ready for a solar adventure? Here are 10 stellar facts about NASA’s Parker Solar Probe, the bold spacecraft that’s set to literally touch the Sun. From a half‑century of planning to breaking speed records, this mission packs more excitement than a fireworks show on a solar flare.
10. Stellar Facts About NASA’s Sun Mission
10. Goal To ‘Touch The Sun’
The Parker Solar Probe is on a quest no other human‑made object has ever attempted: it will plunge into the Sun’s outer atmosphere, or corona, and collect data right where the action is. NASA’s official tagline captures the drama: “This summer, humanity embarks on its first mission to touch the Sun.”
Beyond the headline‑grabbing goal, the probe is designed to unravel the Sun’s secrets and show how solar activity shapes Earth’s magnetic environment—knowledge that’s becoming ever more crucial as our technology gets increasingly vulnerable to solar storms.
This historic plunge will answer long‑standing questions while inevitably sparking fresh mysteries for the next generation of solar scientists.
9. 50-Year Effort
The August 2018 launch capped more than five decades of theory, debate, and engineering. Scientists first sensed the corona’s million‑degree heat in the 1940s and confirmed the existence of the solar wind in the 1960s, yet the mechanisms behind these phenomena remained elusive.
It wasn’t until 1958 that someone proposed actually measuring the corona up close. Over the ensuing years, several spacecraft flirted with the Sun, but none ventured close enough to satisfy Parker’s vision. Budget cuts and shifting priorities shelved many earlier concepts, pushing the ultimate effort back repeatedly.
Now, after half a century of groundwork, the Parker Solar Probe finally brings those early ideas to fruition.
8. First Spacecraft Named After A Living Person
NASA has traditionally christened probes after planets, mythic deities, or even fictional characters, but never after a living individual—until now.
Eugene Parker, born in 1927, is a towering figure in astrophysics, boasting honors such as the National Medal of Science, the Royal Astronomical Society’s Gold Medal, and the Kyoto Prize. His pioneering work on solar wind and the coronal heating problem reshaped our understanding of how stars behave.
In a rare move, NASA named the mission after Parker before launch, making the Parker Solar Probe the first spacecraft to bear the name of a living person as it heads beyond Earth’s orbit.
7. Solar Wind
Solar wind is the mission’s beating heart. Originating in the Sun’s corona, this stream of charged particles can zip through space at speeds up to 1.6 million km/h (about 1 million mph).
Because the corona’s extreme heat weakens the Sun’s grip on its own particles, the wind escapes into the solar system, eventually reaching Earth where it can wreak havoc on satellites and power grids.
By sampling the wind right at its source, scientists hope to decode how the corona heats up and why the solar wind accelerates, turning a cosmic mystery into a tangible set of data.
6. The Sun Is Really Hard To Get To
Getting to the Sun is no walk in the park—its energy demands are roughly 55 times greater than a typical Mars transfer. Though the Sun sits 150 million km (93 million mi) away, the true challenge isn’t distance but the need to cancel out Earth’s sideways orbital motion.
Our planet rockets around the Sun at about 108,000 km/h (67,000 mph). A spacecraft launched directly toward the Sun would inherit this sideways velocity and miss the target entirely. The solution? Launch the probe “backward” at a speed that cancels Earth’s forward motion.
Even after solving the navigation puzzle, the probe still has to survive the blistering environment of the outer corona, a feat made possible by its cutting‑edge heat shield.
5. Gravity Assists From Venus
To shed its sideways speed gradually, the Parker Solar Probe takes advantage of Venus’s gravitational pull. Each close flyby of the planet acts like a cosmic brake, pulling the spacecraft into a tighter orbit around the Sun.
Over the mission’s seven‑year span, the probe will perform seven such Venus fly‑bys, each one shaving away enough orbital momentum to let it dive ever closer to the star.
This intricate dance dictates a narrow launch window—a two‑hour daily slot that repeats for about two weeks each summer when Earth and Venus line up just right.
4. Fastest Man‑Made Object In History
Thanks to the Venus assists, the Parker Solar Probe will eventually blaze through space at a jaw‑dropping 692,000 km/h (430,000 mph)—the fastest speed ever achieved by a human‑made object.
For perspective, NASA’s Juno spacecraft tops out at 266,000 km/h (165,000 mph), while Voyager 1 cruises at about 61,000 km/h (38,000 mph). Parker’s velocity is more than twice Juno’s and eleven times Voyager 1’s.
On Earth, that means the probe could zip from Philadelphia to Washington, D.C., in just one second.
3. Heat Shield
The probe’s heat shield is a marvel of engineering. Measuring 2.4 m (8 ft) across, it sits at the front of the spacecraft, deflecting the Sun’s ferocious heat away from delicate instruments.
It consists of a 11.4 cm‑thick (4.5 in) block of carbon foam sandwiched between carbon‑carbon composite panels, together weighing just 73 kg (160 lb). While the corona’s temperature reaches 1.1–1.7 million °C (2–3 million °F), the shield’s design lets the probe survive by exploiting the sparse distribution of plasma particles.
Lead engineer Betsy Congdon likens it to briefly touching a blazing oven: “Those are very hot, but we’re not touching a lot of them.” The shield enables the probe to survive the Sun’s outer layers without melting.
2. Most Autonomous Spacecraft Ever
Because the Sun‑Earth communication lag is about eight minutes, the probe must act on its own in mere seconds when conditions change. Highly automated software lets it make rapid, real‑time adjustments without waiting for ground control.
The onboard computer is pre‑loaded with every plausible scenario scientists could imagine, allowing the heat shield to rotate, the spacecraft’s orientation to shift, and other critical maneuvers to happen autonomously.
Project scientist Nicola Fox of Johns Hopkins’ Applied Physics Laboratory calls the Parker Solar Probe “the most autonomous spacecraft that has ever flown.”
1. Unique Cargo
While the probe can’t carry heavy payloads, it does transport a very human cargo: the names of more than 1.1 million people who signed up for a virtual seat aboard the mission.
In March 2018, NASA invited the public to submit their names for a memory card on the spacecraft. Iconic actor William Shatner, famed for his role as Captain Kirk, helped promote the campaign, leading to a flood of submissions.“It’s fitting that as the mission undertakes one of the most extreme journeys of exploration ever tackled by a human‑made object, the spacecraft will also carry along the names of so many people who are cheering it on its way,” said project scientist Nicola Fox.
Kurt Manwaring is a syndicated freelance writer at fromthedesk.org.