NASA has begun a crucial test Monday of its towering Space Launch System rocket — marking one of the final steps before the vehicle launches four astronauts into deep space for the first time since the Apollo program ended more than five decades ago. The mission could launch as soon as February 8.The hands-on test, called a “wet dress rehearsal,” involves filling up the rocket’s tanks with more than 700,000 pounds of super-chilled propellants.The rehearsal also is expected to include a run-through of the countdown on launch day — except that during the test run the clock will be halted with less than a minute to go.AdvertisementAdvertisementHow this test plays out will offer hints about when NASA will be able to launch the Artemis II mission — which could occur within several launch windows between early February and late April. At launch, NASA’s Christina Koch, Victor Glover and Reid Wiseman as well as the Canadian Space Agency’s Jeremy Hansen are expected to ride atop the SLS rocket before their Orion spacecraft separates and begins a journey to circumnavigate the moon.NASA confirmed on January 23 that the crew members had entered quarantine in Houston in preparation for their spaceflight. Astronauts are routinely kept isolated ahead of liftoff to prevent illness.The crew is expected to arrive at their Florida launch site at Kennedy Space Center after the wet dress rehearsal is complete.Though the astronauts are not landing on the lunar surface for this mission, their trip is set to carry them deeper into the solar system than any humans have traveled, surpassing the record that Apollo 13 astronauts set in 1970.AdvertisementAdvertisementBefore liftoff, NASA is looking to …
