On Tuesday, due to the shutdown, he found that he couldn't do his research computations, because all NASA websites were down, he told CNN on Facebook.
'No difference from any other day'
But some Americans say they are not immediately feeling any repercussions from the shutdown.
"I can tell absolutely no difference from any other day," Darren Gaskin wrote on Facebook. "Now that the government is shut down, can you make them shut up?"
"It really does not affect me in any way," echoed Andrew Pogue.
As CNN has reported, the government shutdown will affect Americans' daily lives.
Still, some Americans say that so far, the primary impact they're feeling involves their understandings of the government.
"I no longer have even an iota of faith in the US congress," Nicole Davis said on Twitter.