NASA SLS Deep-space rocket to launch in 2018

Artist concept of NASA’s Space Launch System (SLS) 70-metric-ton configuration launching to space. Credit: NASA

The US space agency's powerful deep-space rocket, known as the Space Launch System (SLS), aims to blast off for the first time in 2018, NASA said Wednesday.

The SLS has been in development for three years already, and when finished it should propel spacecraft beyond Earth's orbit and eventually launch crew vehicles to Mars by the 2030s.

NASA has now completed a thorough review of the project, signifying formal space agency commitment to the 70 metric ton version of the SLS at a cost of $7.021 billion from 2014 to 2018.

"The program is making real, significant progress," said William Gerstenmaier, associate administrator for the Human Explorations and Operations Mission Directorate at NASA.

"We will keep the teams working toward a more ambitious readiness date, but will be ready no later than November 2018."

The Government Accountability Office (GAO), however issued a report last month that called into question the space's agency's current funding plan for SLS, saying it "may be $400 million short of what the program needs."

The GAO also raised concerns about the development schedule and how engineers will integrate hardware that was designed to fly on a cancelled NASA program known as Constellation that would have returned humans to the Moon.

Gerstenmaier said NASA was taking those concerns into account and is seeking to address the GAO's recommendations.

The SLS is NASA's first heavy-lift launch vehicle in over 40 years, and the space agency has estimated total costs in developing the first of three SLS variants at $12 billion.