Investing.com -- NASA is revising its moon-landing plans and reducing Boeing Co.'s role while elevating SpaceX's Starship rocket to propel astronauts to lunar orbit, according to a Bloomberg report Thursday.

Under the original plan set years ago, Boeing's Space Launch System rocket would have launched a crew inside the Lockheed Martin Corp-built Orion crew capsule to the moon, with the spacecraft then putting itself in the moon's orbit. A Starship lander would then meet up and dock with the capsule around the moon before taking astronauts down to the lunar surface.

With the new proposal, SLS would no longer be used to boost Orion close to the moon. Instead, Starship and Orion would dock in Earth orbit, giving Starship the pivotal role of propelling the capsule to the moon's orbit before taking astronauts down to the surface.

NASA Administrator Jared Isaacman plans to meet on Tuesday with the companies working on Artemis and human landing system program, including Blue Origin LLC, Boeing and SpaceX, to discuss their progress and the latest plans at the agency. Any changes to the mission could face Congressional scrutiny, and the agency could reverse and alter its plans.

"NASA is committed to using the SLS architecture through at least Artemis V, which is necessary to support both HLS providers, and their associated acceleration plans to return American astronauts to the Moon," Isaacman said in a statement provided by an agency spokesperson.

"We're incredibly supportive of both our HLS providers and their plans to accelerate America's path forward to the moon," Isaacman added.

The consideration is part of a broader effort to accelerate the Artemis program to put humans back on the moon for the first time in more than half a century in 2028.

NASA has been weighing alternatives for landing astronauts on the moon from both SpaceX and Blue Origin, founded by Amazon.com Inc. Executive Chair Jeff Bezos. Both companies hold multibillion-dollar contracts to develop moon landers for Artemis.

If NASA diminishes SLS' key role, the rocket will potentially still be used to launch Orion into Earth orbit.

Boeing's rocket is years behind schedule and billions of dollars over budget. SLS was supposed to debut as early as 2017, but did not fly for the first time until 2022. NASA's inspector general estimated the first four flights of the SLS and Orion together would cost more than $4 billion each.

The plan to use Starship to propel Orion to the moon has been approved, the report said.