NASA Prepares To Touch The Sun

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NASA counted down Friday to the launch of a $1.5 billion spacecraft that aims to plunge into the Sun’s sizzling atmosphere and become humanity’s first mission to explore a star.

The car-sized Parker Solar Probe is scheduled to blast off on a Delta IV Heavy rocket from Cape Canaveral, Florida early Saturday.

The 65-minute launch window opens at 3:33 am (0733 GMT), and the weather forecast is 70 percent favorable for takeoff, NASA said.

The probe’s main goal is to unveil the secrets of the corona, the unusual atmosphere around Sun.

Not only is the corona about 300 times hotter than the Sun’s surface, it also hurls powerful plasma and energetic particles that can unleash geomagnetic space storms and disrupt Earth’s power grid.

“The Parker Solar Probe will help us do a much better job of predicting when a disturbance in the solar wind could hit Earth,” said Justin Kasper, one of the project scientists and a professor at the University of Michigan.

The probe is protected by an ultra-powerful heat shield that is just 4.5 inches thick (11.43 centimeters).

The shield should enable the spacecraft to survive its close shave with the center of our solar system, coming within 3.83 million miles (6.16 million kilometers) of the Sun’s surface.

The heat shield is built to withstand radiation equivalent up to about 500 times the Sun’s radiation here on Earth.

Even in a region where temperatures can reach more than a million degrees Fahrenheit, the sunlight is expected to heat the shield to just around 2,500 degrees Fahrenheit (1,371 degrees Celsius).

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

Scientists have wanted to build a spacecraft like this for more than 60 years, but only in recent years did the heat shield technology advance enough to be capable of protecting sensitive instruments, according to Fox.

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.

“We will also be listening for plasma waves that we know flow around when particles move,” Fox added.

“And last but not least, we have a white light imager that is taking images of the atmosphere right in front of the Sun.”

When it nears the Sun, the probe will travel rapidly enough to go from New York to Tokyo in one minute, some 430,000 miles (700,000 kilometers) per hour, making it the fastest human-made object.

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