US to launch car-sized spacecraft to study Sun

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The U.S. National Aeronautics and Space Administration (NASA) is set

to launch a probe on Saturday to study the Sun closer than any other human-made object before, revealing mysteries behind the fiery surface.

NASA disclosed that, the car-sized spacecraft called Parker Solar Probe is programmed to lift off on a United Launch Alliance Delta IV Heavy, carrying instruments to study the Sun both remotely and directly.

NASA said one science task of the probe is to study the acceleration of the solar wind and the Sun’s constant outflow of material, while the other is exploring the secret of the corona’s enormously high temperatures.

Besides, Parker Solar Probe’s instruments might reveal the mechanisms at work behind the acceleration of solar energetic particles, which can reach speeds of more than half the speed of light as they rocket away from the Sun.

 

[penci_blockquote style=”style-2″ align=”none” author=””]The heat shield is a sandwich of carbon-carbon composite surrounding nearly four and half inches of carbon foam, which is about 97 per cent air.[/penci_blockquote]

Such particles can interfere with satellite electronics, especially for satellites outside of Earth’s magnetic field. According to NASA, the biggest breakthrough for the spacecraft is its cutting-edge heat shield.

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“The Thermal Protection System (the heat shield) is one of the spacecraft’s mission-enabling technologies, ”said Andy Driesman, Parker Solar Probe project manager at the Johns Hopkins Applied Physics Lab. “It allows the spacecraft to operate at about room temperature.”

The heat shield is a sandwich of carbon-carbon composite surrounding nearly four and half inches of carbon foam, which is about 97 per cent air.

The solar array cooling system and on-board fault management system are also innovations of the probe.

The cooling system allows the solar arrays to produce power under the intense thermal load from the Sun, and the fault management system protects the spacecraft during the long periods of time when the spacecraft can’t communicate with the Earth.

“The launch energy to reach the Sun is 55 times that required to get to Mars, and two times that needed to get to Pluto,” said Guo Yanping from the Johns Hopkins Applied Physics Laboratory, who designed the mission trajectory.

 

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“During summer, Earth and the other planets in our solar system are in the most favorable alignment to allow us to get close to the Sun,” Guo added.

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The Sun constantly sends magnetized material outward, and the magnetic energy can burst out with light and particle radiation that travel through space and create temporary disruptions in our atmosphere, sometimes garbling radio and communications signals near Earth.

The key to understanding its origins lies in understanding the Sun itself and that’s where Parker

Solar Probe comes in, according to the researchers at NASA.

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