NASA and SpaceX on Monday will launch its SPHEREx and PUNCH spacecraft missions tasked to create a three-dimensional map of hundreds of millions of galaxies in order to better understand our known universe.

SpaceX plans to launch NASA’s SPHEREx Observatory and PUNCH satellites from its Falcon 9 rocket Monday which may be seen in the skies above California.

SpaceX has designated a new launch time for NASA's SPHEREx Observatory and PUNCH satellites launch for Monday, March

The spacecraft, SPHEREx and PUNCH, had been expected to launch on a SpaceX rocket on Saturday. Two NASA missions will have to wait longer for a launch aboard a single rocket. Both aim to unravel mysteries about the universe — one by peering far from Earth, the other by looking closer to home.

The missions' first several delays were to allow for additional time for checkouts and processing on the Falcon 9 rocket they'll ride to space, according to NASA. Now, the delay is to "allow SpaceX to complete rocket preparations ahead of liftoff," NASA said in an update.

Developed over the past decade, NASA's $488 million SPHEREx mission will map the celestial sky in 102 infrared colors, surpassing any previous mission in its capability.

NASA's SPHEREx mission is expected to map the entire sky four times over two years, offering a window into how the universe came to be. Former astronaut Mike Massimino breaks down NASA's latest scientific mission to explore the galaxies.

Watch live as NASA launches the SPHEREx telescope and PUNCH mission aboard a SpaceX Falcon 9 rocket to explore the universe and the sun. SPHEREx will create a 3D all-sky map of 450 million galaxies, while PUNCH will use small satellites to study the sun’s impact on space weather and Earth’s communications.