Why NASA's Parker Solar Probe spacecraft launched to 'touch' Sun won't melt

Parker Solar Probe will make six more Venus flybys and 24 total passes by the Sun, journeying steadily closer to the Sun until it makes its closest approach at 3.8 million miles.

As NASA launced 'Parker Solar Probe', mankind's first mission to 'touch' the Sun, it left us all wondering - how and why will it not melt?

NASA's Parker Solar Probe in on a seven-year long journey to unlock the mysteries of the star's fiery outer atmosphere and its effects on space weather.

Throughout its seven-year mission, Parker Solar Probe will make six more Venus flybys and 24 total passes by the Sun, journeying steadily closer to the Sun until it makes its closest

approach at 3.8 million miles.

At this point, the probe will be moving at roughly 700,000 kilometres per hour, setting the record for the fastest-moving object made by humanity. At closest approach, the solar shield of

the probe will face temperatures approaching 1,377 degrees Celsius. 

So how did the engineers manage to build something that it won't melt even in extreme heat condition? Well, the secret lies in its shield. The spacecraft and instruments will be protected

from the Sun's heat by a 4.5-inch-thick carbon-composite shield, which will need to withstand temperatures outside the spacecraft. 

“The key lies in its custom heat shield and an autonomous system that helps protect the mission from the Sun’s intense light emission, but does allow the coronal material to ‘touch’ the

spacecraft,” NASA said in a statement according to news agency ANI report.

NASA on Twitter even demonstrated how the carbon-composite shield will withstand the exreme temperature from the Sun.

The launch of the United Launch Alliance Delta IV Heavy rocket carrying the spacecraft was scrubbed on Saturday due to a violation of a launch limit, resulting in a hold.

"The spacecraft is in good health and operating on its own. Parker Solar Probe has begun its mission to 'touch' the Sun," NASA said in a blog post, about two hours after the lift off.

The mission is the first to be named after a living scientist -- 91-year-old Eugene N Parker, who first predicted the existence of the solar wind in 1958.

The heliophysics pioneer watched the liftoff from NASA's Kennedy Space Center. A plaque dedicating the mission to Parker was attached to the spacecraft in May. It includes a quote from the

physicist, "Let's see what lies ahead." It also holds a memory card containing more than 1.1 million names submitted by the public to travel with the spacecraft to the Sun.

The mission's findings will help researchers improve their forecasts of space weather events, which have the potential to damage satellites and harm astronauts on orbit, disrupt radio

communications and, at their most severe, overwhelm power grids, NASA said.

"This mission truly marks humanity's first visit to a star that will have implications not just here on Earth, but how we better understand our universe," said Thomas Zurbuchen, associate

administrator of NASA's Science Mission Directorate. 

"We've accomplished something that decades ago, lived solely in the realm of science fiction," Zurbuchen said.

During the first week of its journey, the spacecraft will deploy its high-gain antenna and magnetometer boom. It also will perform the first of a two-part deployment of its electric field

antennas.

Instrument testing will begin in early September and last approximately four weeks, after which Parker Solar Probe can begin science operations.

"Today's launch was the culmination of six decades of scientific study and millions of hours of effort," said project manager Andy Driesman, of the Johns Hopkins University Applied Physics

Laboratory (APL).

"Now, Parker Solar Probe is operating normally and on its way to begin a seven-year mission of extreme science," said Driesman.

Over the next two months, Parker Solar Probe will fly towards Venus, performing its first Venus gravity assist in early October - a manoeuvre a bit like a handbrake turn - that whips the

spacecraft around the planet, using Venus's gravity to trim the spacecraft's orbit tighter around the Sun.

This first flyby will place Parker Solar Probe in position in early November to fly as close as 15 million miles from the Sun - within the blazing solar atmosphere, known as the corona -

closer than anything made by humanity has ever gone before.

The spacecraft will transmit its first science observations in December, beginning a revolution in our understanding of the star that makes life on Earth possible.

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