These photos show the 215-foot-tall Falcon 9 rocket and Crew Dragon spacecraft at launch pad 39A, ready for liftoff from Florida’s Space Coast on a critical test flight to the International Space Station.

Watch NASA’s news conference to preview three spacewalks outside the International Space Station planned for late March and early April to prepare for the future arrival of U.S. commercial crew spacecraft and upgrade station hardware.

NASA astronaut Nick Hague will take the place of Anne McClain on a spacewalk Friday outside the International Space Station, teaming up with crewmate Christina Koch  to continue a series of battery upgrades on an excursion that would have been the first all-female spacewalk in history.