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The 233-foot tall probe. Credit: NASA/Johns Hopkins APL/Ed Whitman

NASA is set to launch the first space mission to enter the sun's corona, with the launch slated for Saturday from Cape Canaveral Air Force Station in Florida.

The big picture: The Parker Solar Probe stands out for just how close to the sun it plans to reach: less than 3.82 million miles away. By comparison, we live a comfortable 93 million miles away from our solar system's star. Assuming a successful launch, the probe will also become the fastest-moving man-made object ever, traveling at 340,000 miles per hour.

Why it matters: At a press conference on Thursday, project scientist Nicola Fox said that engineers and scientists have been waiting 60 years to be able to develop the right technology to build this type of probe. "We know a lot about the sun," she said, but there are key mysteries that will be unsolvable until a spacecraft can reach closer to its surface.

For example, Fox said:

"The corona that we all saw during the total solar eclipse is 300 times hotter than the surface of the sun, and we want to figure out why that’s happening. Why is this atmosphere continually expanding and accelerating away from the star?"

Answering these questions will improve scientific understanding and also help build resiliency on Earth against volatile space weather.

  • The probe also honors by name Eugene Parker, a 91-year-old solar astrophysicist who developed meaningful (but initially rejected) theories about the solar corona, solar wind and the magnetic fields between Earth and the sun.
  • Parker is the first namesake of a mission to be alive at the time of launch, NASA said.

How it works: The probe will encounter incredibly hot temperatures of up to 2,500°F as it travels close to the sun, and extremely cold temperatures on the other end of its orbit as it travels near Venus. Most of the probe is shielded by a 4.5-inch-thick carbon composite foam material "umbrella" that will keep it at tolerable operational temperatures.

But other parts of the probe will be exposed directly to whatever temperature extremes the spacecraft passes through. Fox said the solar probe cup, which "peeps around the heat shield" is the "bravest" piece of the probe. It's made materials like molybdenum, niobium and tungsten.

Image: Greg Stanley/Johns Hopkins University

The details: The probe is set to launch at 3:33 AM on Saturday aboard a ULA Delta IV Heavy rocket, but there's a 65 minute launch window in case conditions are not ideal.

  • The probe is 233 feet tall, making it almost as tall as a football field is long. It will gradually shed layers as it travels into outer space. At launch, it weighs approximately 1,400 pounds.
  • In all, the project has been a long time coming, with thousands of dedicated workers that, by project manager Andy Driesman's calculations, have worked more than 4 million hours over ten years.
  • You can watch the launch live on NASA TV here.

Go deeper

Updated 47 mins ago - Science

China launches first astronauts to new space station

The manned Shenzhou-12 spacecraft from China's Manned Space Agency onboard the Long March-2F rocket launches at the Jiuquan Satellite Launch Center in Jiuquan, Gansu province, China, on Thursday morning Beijing time. Photo: Kevin Frayer/Getty Images

China's Shenzhou 12 mission carrying three astronauts launched into orbit on Thursday morning Beijing time.

Why it matters: Astronauts Nie Haisheng, Liu Boming and Tang Hongbo are set to occupy China's new space station. This will be the country's longest crewed space mission ever and the first in almost five years.

Biden's two-step negotiating process

President Biden departs Geneva. Photo: Martial Trezzini/Pool/AFP via Getty

President Biden's summit "reset" was less about trying to make a friend out of Russia than reframing what the U.S. believes can be accomplished by engaging with President Vladimir Putin.

Driving the news: The Geneva meeting yielded no immediate breakthroughs beyond agreements about ambassadors returning to work and plans to launch talks on nuclear security. But in classic Biden fashion — aviators on, jacket off and a one-liner about invading Russia he had to clarify was a joke — the U.S. president used a post-summit news conference to explain his approach.

Scoop: NRCC to accept cryptocurrency donations

Illustration: Sarah Grillo/Axios

The Republicans' House campaign arm will begin accepting contributions in cryptocurrency, Axios has learned.

Why it matters: The National Republican Congressional Committee is the first national party committee to solicit crypto donations. That puts it at the forefront of a disruptive financial technology that could test campaign finance rules.

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