The two astronauts have a busy day ahead of them. Hague and Williams will "patch light leaks in the NICER X-ray telescope, then ready the Alpha Magnetic Spectrometer for future upgrades," NASA officials wrote in a Jan. 15 blog post.

The US space agency announced Thursday that two astronauts successfully completed a spacewalk to repair the International Space Station (ISS). During the six-hour mission, astronauts Suni Williams and Nick Hague replaced faulty light filters and reflectors,