Asked during his first-ever Twitter town hall meeting about where America stands in terms of space exploration with the about to end after 30 years, Obama said he was "proud" of the past but eager for a new leap forward.

"We are still a leader in , but, frankly, I have been pushing NASA to revamp its vision," Obama said.

"The shuttle did some extraordinary work in low-orbit experiments, the , moving cargo. It was an extraordinary accomplishment. And we're very proud of the work that it did," he added.

"But now what we need is that next technological breakthrough."

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