"Btw [by the way], SpaceX is no longer planning to upgrade Falcon 9 second stage for reusability. Accelerating BFR [Big Falcon Rocket] instead. New design is very exciting! Delightfully counter-intuitive," Musk posted on Twitter.
In his reply to a Twitter user, Musk specified that "radical" changes had been introduced to the BFR design.
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While the first stage of the Falcon 9 rocket has already been reused, Musk announced in April he plans to make its second stage reusable as well in order to make space flights more affordable via decreasing the launch price.
The BFR reusable launch vehicle and spacecraft system is currently being developed by the SpaceX and is set to be a part of a lunar mission scheduled for 2023.