Parker Solar Probe: How We See the Beautiful, Violent Sun

Parker Solar Probe did something extraordinary in July 2025. It snapped the closest ever images of the sun, just 3.8 million miles from the solar surface, deep within the outer corona. The photographs show the solar wind racing outward, a river of charged particles streaming from our star into the void. That image is the latest chapter in a story that stretches back thousands of years. Humans have always watched the sun. What changed is how.

Clay Tablets to Telescopes

The ancient Babylonians and Chinese tracked sunspots and solar eclipses, scratching their observations into clay tablets. Those records outlasted entire civilizations. Then came the telescope. In the early 1600s, astronomers like Galileo Galilei, Christoph Scheiner, and Johannes Fabricius pointed these new instruments at the sun. They projected its image onto paper and saw dark blemishes drifting slowly across the solar surface. Scheiner argued those spots were satellites orbiting the sun. Galileo disagreed. He insisted they resided on the sun itself. Galileo was right.

The Sunspot Wars

Galileo published his Letters on Sunspots in 1613. He thought the dark spots resembled clouds. Scheiner, a Jesuit mathematician, developed a safer method for observing them, projecting the sun's image through a telescope onto a screen. Their debate pushed solar science forward, but neither man understood what those spots actually were. That answer took centuries.

An Element Born in the Stars

In the 1800s, spectroscopy changed everything. By splitting light into a kind of barcode, scientists could read an object's elemental makeup. Pierre Janssen and Norman Lockyer independently found lines in the sun's spectrum that matched no known element on Earth. Lockyer named it helium, after Helios, the Greek god of the sun. It took another 27 years before Sir William Ramsay isolated and identified helium on our planet. The sun had revealed a piece of itself that was hiding right here all along.

The Magnetic Revelation

George Ellery Hale delivered the next leap in the early 1900s. Those dark spots Galileo and Scheiner had argued about? They were not blemishes. They were magnetic storms, regions of intense activity that waxed and waned on an 11-year cycle. Hale had cracked open the sun's true nature. It was not a placid ball of fire. It was a dynamic, magnetic beast.

On September 1, 1859, the English astronomer Richard Carrington spotted an unusual and sudden brightening on the solar surface. He mapped it carefully. Seventeen hours later, the northern lights blazed as far south as Cuba. Telegraph systems across the Western world failed. Some even caught fire. The Carrington Event became the first documented case of a geomagnetic storm tied to a solar flare. The sun had teeth.

Breaking Through Earth's Blanket

The French astronomer Bernard Lyot built a coronagraph in 1930. It was a telescope with a disc at its center that blocked the sun's blinding light, creating an artificial eclipse on demand. For the first time, scientists could study the corona, the sun's ghostly outer atmosphere, without waiting for the moon to cooperate. Then came the space age. From the 1950s onward, satellites and probes escaped Earth's observational barriers entirely. They began directly measuring the solar wind, that constant stream of charged particles the sun hurls in all directions, along with coronal mass ejections, plasma founts that rank among the most energetic events in our solar neighborhood.

An Unblinking Watch

Since 1995, the Solar and Heliospheric Observatory, a collaboration between NASA and the European Space Agency, has kept constant surveillance. NASA's Solar Dynamics Observatory joined the watch in 2010. These orbiting sentinels revolutionized space weather forecasting. They captured solar flares in exquisite detail, including a massive flare in October 2014 from NOAA 12192, the largest active region on the sun in nearly a quarter century.

Parker Solar Probe Touches the Sun

And this is where it gets interesting. Parker Solar Probe first flew through the corona itself in 2021. Its pass in 2024 was the closest any human made object has ever come to a star. Then came July 2025. Parker Solar Probe trained its cameras on the sun from inside the outer corona, just 3.8 million miles from the surface. The resulting image shows the solar wind racing out from the corona, a view no human had ever seen before.

Solar Orbiter, a joint mission of the European Space Agency and NASA that launched in 2020, added another first. All previous views of the sun had been oriented toward its equator, taken from the plane on which Earth orbits. Solar Orbiter provided the first look at the sun's south pole. Over eight days of observations, it measured the tracks of magnetic imprints in the chromosphere, the layer between the sun's surface and the corona, elongated by the sun's rotation. The polar magnetic field was in motion, alive.

What We Now Watch

• The Solar and Heliospheric Observatory, still operating after three decades, maintains its uninterrupted view from a point on the direct line between the sun and Earth
• The Solar Dynamics Observatory captures high resolution images in multiple wavelengths of extreme ultraviolet light
• Parker Solar Probe flies closer than any object in history, sampling the corona directly
• Solar Orbiter reveals the sun's poles for the first time

The Questions That Remain

But there is a catch. The instruments keep improving and the secrets they uncover continue to fascinate, yet fundamental mysteries persist. The corona burns hundreds of times hotter than the surface below it. That defies basic intuition. Heat should dissipate as you move away from the source, not intensify. Scientists still cannot fully explain why.

Why is the corona hundreds of times hotter than the surface below it? What drives the solar cycle? How do the electromagnetic radiation bursts known as flares decide to erupt?

These are not new questions. They have accumulated over centuries of observation, from clay tablets in Babylon to the cameras of Parker Solar Probe. The sun remains, as it has always been, both beautiful and violent. We see it now with astonishing clarity. But seeing is not the same as understanding.

The journey from Galileo's projected sunspots to Parker Solar Probe's coronal close ups spans four centuries. Each generation built instruments that were unthinkable to the last. The next generation will likely do the same. The sun will keep burning, keep flaring, keep hurling plasma into space. And we will keep watching, closer than ever before.

Key Milestones in Solar Observation

• Ancient era: Babylonians and Chinese record sunspots and eclipses on clay tablets
• Early 1600s: Galileo, Scheiner, and Fabricius turn telescopes toward the sun
• 1800s: Janssen and Lockyer discover helium through spectroscopy
• 1859: The Carrington Event links a solar flare to geomagnetic chaos on Earth
• Early 1900s: Hale identifies sunspots as magnetic storms on an 11-year cycle
• 1930: Lyot builds the coronagraph, enabling eclipse free coronal study
• 1995: SOHO begins constant solar surveillance
• 2021: Parker Solar Probe flies through the corona
• 2025: Parker Solar Probe captures the closest ever images of the sun

Frequently Asked Questions

What did the Parker Solar Probe achieve in July 2025?

In July 2025, the Parker Solar Probe snapped the closest ever images of the sun from just 3.8 million miles within the outer corona. The image shows the solar wind racing outward from the corona, a view no human had ever seen before.

Why is the corona's temperature considered a fundamental mystery?

The corona burns hundreds of times hotter than the surface below it, defying basic intuition that heat should dissipate as you move away from the source. Scientists still cannot fully explain why the corona is so much hotter.

How did George Ellery Hale change our understanding of sunspots?

In the early 1900s, Hale identified that sunspots were not blemishes but magnetic storms, regions of intense activity that waxed and waned on an 11-year cycle. He cracked open the sun's true nature as a dynamic, magnetic beast.

When did the Carrington Event occur and what were its effects?

On September 1, 1859, English astronomer Richard Carrington spotted an unusual brightening on the solar surface. Seventeen hours later, the northern lights blazed as far south as Cuba and telegraph systems across the Western world failed, some even catching fire.

Who first discovered helium in the sun's spectrum?

Pierre Janssen and Norman Lockyer independently found lines in the sun's spectrum that matched no known element on Earth. Lockyer named the element helium, after Helios, the Greek god of the sun.