Mr Lightfoot also sent a memo to Nasa employees.
Acting NASA Administrator Robert Lightfoot announced that the agency would be conducting a feasibility study for a crewed SLS launch during a conference in Washington D.C. this morning, according to the NASA press office.
SpaceX plans to launch nearly 5,500 pounds of science experiments, supplies and research equipment for NASA to the International Space Station on Saturday morning.
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Upon arrival at the space station, astronauts Shane Kimbrough of NASA and Thomas Pesquet of ESA will use the station's robotic arm to capture Dragon.
According to current plans, SLS's second launch, EM-2, will be a crewed mission.
SpaceX is targeting February 18 to launch its Dragon space freighter atop a Falcon 9 rocket from Kennedy Space Center in Florida. The first test of Orion aboard a Space Launch System rocket is now planned without human passengers.
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What's more, thimerosal was never used in the measles-mumps-rubella vaccine that some vaccine skeptics claim causes autism. And since then, researchers have found that autism rates among children haven't gone down .
The mission will last three weeks and will involve the Orion craft orbiting the Moon for six days.
The first Orion piloted mission will be launched no sooner than 2021. With astronauts on board, the mission would most likely be shorter. If NASA adds a crew to EM-1, the additional costs and delays could push the flight back even further, not to mention the risk of flying astronauts on an untested rocket.
Mr Lightfoot also wrote: "From my interactions with the transition team, Nasa is clearly a priority for the President and his administration".
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Taking place in early 2017, LEGOLAND Parks and LEGOLAND Discovery Centers will hold special events for fans to take part in. Performing this role demands focus, passion and the very best performance I can give.
Laurel Kornfeld is a freelance writer and amateur astronomer from Highland Park, NJ, who enjoys writing about astronomy and planetary science.