Nasa's coolest Parker Solar Probe to lift off and touch Sun soon

This rendering demonstrates the anticipated approach of the Parker Solar Probe to the sun’s atmosphere

The journey, called the Parker Solar Probe, will loop around the sun 24 times, flying within the star's hot million-degree atmosphere.

At 3:33 a.m. EDT, the Parker Solar Probe will launch from Space Launch Complex 37 on Florida's Cape Canaveral Air Force Station.

Scientists also hope the probe can help them to answer why the corona, the outermost layer of the sun's atmosphere, is 300 times hotter than its surface. The current close-to-the-sun champ, NASA's former Helios 2, got within 27 million miles (43 million kilometers) in 1976. Over the next seven years, the Parker Solar Probe will fly by Venus seven times, using the planet's gravity to bring itself closer to the Sun each time.

The probe is relying on a 4.5 inch carbon heat shield which has taken 10 years to develop and which is so strong it will survive for billions of years even when the rest of the spacecraft has disintegrated.

Scorching, yes? But if all works as planned, the inside of the spacecraft should stay at just 85 deg F (29 deg C).

"The sun is full of mysteries", said Nicky Fox, project scientist at the Johns Hopkins University Applied Physics Lab. In March, members of the public were invited to be a part in the historic mission by submitting their names to be placed on a memory card that the spacecraft will take into space.

"We are ready. We have the flawless payload". During its closest solar approaches, the spacecraft will hurtle through the corona at 430,000 miles per hour (690 kph), setting a speed record.

Parker, now 91, recalled that at first, some people did not believe in his theory.

Image: The spacecraft can withstand enormous heat.

"It was just a matter of sitting out the deniers for four years until the Venus Mariner 2 spacecraft showed that, by golly, there was a solar wind", Parker said earlier this week.

Tools on board will measure high energy particles associated with flares and coronal mass ejections, as well as the changing magnetic field around the Sun.

After it launches, the probe will travel at a record-breaking 430,000 miles per hour, the fastest speed ever achieved by a spacecraft. "We're a technological society, so we have to understand this to better understand its impact and ultimately to be able to predict it just like we do weather on Earth".

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