At its closest approach, the probe will be 3.9 million miles from the sun's surface - closer than any spacecraft in history.
The one-point-five billion dollar mission aims to discover why the corona, the sun's atmosphere., is so much hotter than it's surface, and also to investigate the cause of solar winds.
It will take six years for the probe to make to reach its closest point to the sun, in 2024, by using Venus' gravity to bring itself nearer and nearer to the star.
A heat shield made using carbon composite coated with ceramic will protect it from the extreme conditions, Nasa says.
The spacecraft eventually will run out of fuel and, no longer be able to keep its heat shield pointed toward the Sun, will burn and break apart - except perhaps for the rugged heat shield. While the shield will be facing temperatures of up to 2,500 degrees Fahrenheit, the spacecraft will be at a toasty but tolerable 85 degrees. NASA will send the probe off on its mission with 55 times more energy than would be needed to reach Mars, the space agency explains. "Well, Parker Solar Probe's going to be in there", said project scientist Nicola Fox of Johns Hopkins University. Notably, the Parker Solar Probe is also the first NASA spacecraft to be named after a living person. Parker is now 91 years old and at Cape Canaveral with his family to witness his first launch - a Delta IV Heavy rocket with the spacecraft bearing his name.
It's created to take solar punishment like never before, thanks to its revolutionary heat shield that's capable of withstanding 1,370 degrees Celsius.
"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.
"We will also be listening for plasma waves that we know flow around when particles move", Fox added.
After it launches, the probe will travel at a record-breaking 430,000 miles per hour, the fastest speed ever achieved by a spacecraft.
"With each orbit, we'll be seeing new regions of the sun's atmosphere and learning things about stellar mechanics that we've wanted to explore for decades".