NASA and SpaceX halted the countdown late Thursday for the launch of four astronauts to the International Space Station.

Mission managers rescheduled the liftoff for early Saturday morning, giving them an extra 24 hours to close out lingering issues, officials said. Nearly ideal weather was expected.

The four astronauts, representing four countries, had not yet headed to the SpaceX Falcon rocket awaiting them on the pad.

They are expected to spend six months at the space station, replacing four astronauts who have been there for half a year.

SBUDNIC, built by an academically diverse team of students, was confirmed to have successfully reentered Earth's atmosphere in August, demonstrating a practical, low-cost method to cut down on space debris.

When it comes to space satellites, getting the math wrong can be catastrophic for an object in orbit, potentially leading to its abrupt or fiery demise. In this case, however, the fiery end was cause for celebration.

About five years ahead of schedule, a small cube satellite designed and built by Brown University students to demonstrate a practical, low-cost method to cut down on space debris reentered Earth's atmosphere sometime on Tuesday, Aug.