Of all matter in the Solar System, about 99.8 percent of it is all concentrated at the Sun.
The mission has been 60 years in the making to send a small but mighty craft on a 4.9 billion-mile journey to touch the sun.
As the probe orbits the sun, it will experience extreme radiation with temperatures expected to reach 1,377C (2,510F), which is close to the melting point of steel.
Nasa aims to collect data about the highly magnetised corona. Not exactly, explains NASA. One reason is that the Earth is moving 67,000 miles per hour nearly entirely sideways relative to the sun.
Scientists hope the mission will be able to provide answers as to why the corona is 300 times hotter than the surface of the sun, a phenomenon that Nasa says is in "defiance of all logic" because "its atmosphere gets much, much hotter the farther it stretches from the sun's blazing surface".
It will launch using a Delta IV Heavy rocket and on its trip, the probe will perform seven Venus gravity assists over the seven-year mission to shed sideways speed.
All these gravity assists over at Venus should draw Parker's orbit closer and closer to the Sun.
The Parker Solar Probe, named after American solar astrophysicist Eugene Parker, will fly closer to our star than any other man-made object.
After it launches, the probe will travel at a record-breaking 430,000 miles per hour, the fastest speed ever achieved by a spacecraft. At its peak, the Parker Solar Probe is likely to clock in at over 692,000 km per hour on its final orbits.