After a last-minute technical problem forced NASA to postpone for 24 hours the launch of its first mission to explore the Sun, the agency plans to try again on Sunday.
The new 60-minute launch window opens at 3:31 a.m. (0731 GMT) for Parker Solar Probe, a $ 1.5 billion unmanned spacecraft that aims to get closer to the center of our solar system in history.
The probe is designed to immerse itself in the mysterious atmosphere of the Sun, known as the corona, which extends 3.83 million miles (6.16 million kilometers) from its surface during a seven-year mission.
It is protected by an ultra-powerful heat shield that can withstand unprecedented levels of heat and radiation 500 times greater than that experienced on Earth.
The car-sized probe is designed to help scientists better understand the solar wind and geomagnetic storms that risk causing chaos on Earth by knocking out the power grid.
The Saturday weed was caused by a helium gas sensor that exceeded the launch limit on the Delta IV-Heavy rocket, the United Launch Alliance said.
According to ULA, the weather forecast is expected to be approximately 60 percent favorable for the launch.