LIVE: Astronaut Don Pettit is talking about his recent mission to the @Space_Station. If you have questions for @astro_Pettit, share them with #AskNASA—or join us at 3:15pm ET (1915 UTC) for a live Q&A with Don on our Instagram! t.co/MOlmaV7zQm t.co/qll5rzU3X7