The new, 60-minute launch window opens at 3.31am (3.31pm Singapore time) for the Parker Solar Probe, a US$1.5 billion (S$2 billion) unmanned spacecraft that aims to get closer than any human-made object in history to the centre of our solar system.
If the probe doesn't launch on Sunday, the window for a successful launch doesn't close until August 23.
The mission is expected to shatter a number of records: It will approach seven times closer to the sun than any other manmade object ever has, and it will be Nasa's fastest spacecraft, reaching top speeds of over 400,000 miles per hour (643737 kmh - fast enough, as Nasa's website says, to get from Washington, DC, to Philadelphia in less than one second).
NASA says it will try again Sunday.
The goal for the Parker Solar Probe is to make 24 passes through the corona during its seven-year mission.
NASA's $1.5 billion Parker Solar Probe spacecraft, the size of a auto, 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.
The launch of a United Launch Alliance Delta IV Heavy rocket carrying the Parker Solar Probe spacecraft was scrubbed today due to a violation of a launch limit, resulting in a hold.
Trump calls Omarosa 'a lowlife' after memoir claims racial slurs
According to her, Trump suggested he was sworn in over the book instead of the Bible. Omarosa Manigault has a book coming out and she's wasting no time to promote it.
"And it needs to be, because it takes an vast amount of energy to get to our final orbit around the Sun", Driesman added.
"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.
The probe is named after Eugene Parker, a solar physicist who in 1958 first predicted the existence of the solar wind, the stream of charged particles and magnetic fields that flow continuously from the Sun.
"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 fly by Venus seven times throughout the mission".
The probe is protected by an ultra-powerful heat shield that is 4.5 inches (11.43 centimeters) thick.
It is created to withstand heat of up to 1,000 degrees Celsius, speeds of 700,000 kilometres per hour and a journey that will last seven years. The current close-to-the-sun champ, NASA's former Helios 2, got within 27 million miles (43 million kilometers) in 1976.