The probe is created to plunge into the Sun's mysterious atmosphere, known as the corona, coming within 3.83 million miles (6.16 million kilometres) of its surface during a seven-year mission.
Nasa is planning to launch the $1.5bn probe towards the sun, with an aim to offer the closest-ever glimpse of the star at the centre of the solar system.
The space agency scrubbed the launch due to a last-minute anomaly in the United Launch Alliance Delta IV Heavy rocket sheduled to launch the Parker Solar Probe at 4:28 a.m. EDT (0828 GMT), NASA officials said.
According to NASA, the forecast shows a 60 percent chance of favourable weather conditions for launch.
The Parker probe will swing close to the sun, then out around Venus, and back again, 24 times over the next seven years.
The probe is set to use seven Venus flybys over almost seven years to gradually reduce its orbit around the Sun, using instruments created to image the solar wind and study electric and magnetic fields, coronal plasma and energetic particles.
Not only is the corona about 300 times hotter than the Sun's surface, but it also hurls powerful plasma and energetic particles that can unleash geomagnetic space storms, wreaking havoc on Earth by disrupting the power grid.
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The probe is protected by an ultra-powerful heat shield that is just 11.43 centimetres thick.
The probe is equipped with a 4 1/2-inch thick carbon-carbon heat shield created to withstand temperatures of about 2,500 degrees Fahrenheit. The US$1.5 billion mission is already a week late because of rocket issues.
"We'll be going where no spacecraft has dared go before - within the corona of a star", said project scientist Nicky Fox from Johns Hopkins University Applied Physics Laboratory.
Poking out over the heat shield, an instrument known as the Faraday cup will take measurements of the solar winds, a flow of ionised gases from the sun that streams past Earth at a million miles per hour.
"Parker Solar Probe uses Venus to adjust its course and slow down in order to put the spacecraft on the best trajectory", said Driesman.
"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 NY to Tokyo in one minute - some 430,000 miles per hour, making it the fastest human-made object.