The replacements for NASA's two stuck astronauts are on their way to the International Space Station aboard the Crew Dragon, which launched from Kennedy Space Center.

The SPHEREx telescope will create the most colorful map of the cosmos, while the four satellites of the PUNCH mission track the evolution of the solar wind in three dimensions.

NASA has scrubbed its launch to take four astronauts to the International Space Station, which is one of the first steps in returning NASA astronauts Suni Williams and Butch Wilmore’s back to Earth. NBC News' Tom Costello has more on the reasons for the scrub.