John Grunsfeld

@SciAstro

Lead for Science at NASA (Associate Administrator) Astronaut STS-67,81,103,109,125 Hubble Hugger, Space and Earth explorer

go.nasa.gov/johngrunsfeld
Joined February 2012
156 Photos and videos Photos and videos

Tweets

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  2. Retweeted
    Jan 20

    Earth’s 2015 surface temps were the warmest since modern record keeping began in 1880:

    7:42 AM - 20 Jan 2016 · Details
    4,760 retweets 3,766 likes
  3. Jan 17

    Great launch into the fog but lots of noise. in flight coast waiting for next burn to final orbit 40 min

    10:57 AM - 17 Jan 2016 · Details
    35 retweets 57 likes
  4. Jan 17

    T-10 min and counting. Go go

    2 retweets 11 likes
  5. Jan 17

    The fog is starting to clear inside on 30 min to go. Watch at

    View summary Hide summary
    1 retweet 7 likes
  7. Jan 17

    T-2hrs to launch. The fog has rolled in on the The coastal fog is due poetically off the sea

    8:47 AM - 17 Jan 2016 · Details
    2 retweets 19 likes
  8. Jan 17

    The sun is coming up on a beautiful day for launch at 1042a this morning at Vandenberg AFB.

    7:20 AM - 17 Jan 2016 · Details
    8 retweets 13 likes
  9. Retweeted
    Jan 17

    It's launch day today! Launch of atop a SpaceX Falcon 9 rocket will occur at10:42am PT/1:42pm ET

    7:15 AM - 17 Jan 2016 · Details
    45 retweets 62 likes
  10. Retweeted
    Jan 15

    We do not tolerate sexual harassment. Our administrator is sending a letter to grantees on federal polices:

    View summary Hide summary
    504 retweets 1,189 likes
  11. Retweeted
    Jan 15

    News briefing on sea-level monitoring TODAY at 4pm PT . Questions? !

    11:34 AM - 15 Jan 2016 · Details
    201 retweets 434 likes
  12. Retweeted
    Jan 14 Washington, DC

    NASA does not tolerate sexual harassment nor should any org committed to workplace equality, diversity and inclusion-Science is for everyone

    28 retweets 53 likes
  13. 16 Dec 2015

    Adam Szabo from NASA talking about results at with VP Gore

    1:26 PM - 16 Dec 2015 · Details
    4 retweets 7 likes
  14. 16 Dec 2015

    VP Al Gore discussing a plan of action to solve the challenge of climate change

    12:56 PM - 16 Dec 2015 · Details
    2 retweets 6 likes
  15. Retweeted
    11 Dec 2015

    We lost contact with STEREO-B in October 2014. Read about our plan to get it back:

    8:37 AM - 11 Dec 2015 · Details
    77 retweets 95 likes
  16. 11 Dec 2015

    Mirror #6 heads for the backplane of Watch live at

    1:31 PM - 11 Dec 2015 · Details
    6 retweets 11 likes
  17. 2 Dec 2015

    launch is on for tonight 11:04 EST

    5 retweets 6 likes
  18. 1 Dec 2015

    launch delayed 24 hours. 100 years since general relativity was born, 1 more day or so is OK

    11 retweets 17 likes
  19. 1 Dec 2015

    Leading the way to the detection of gravitational waves in space: launch tonight:

    4 retweets 12 likes
  20. John Grunsfeld followed , , and 5 others
    • Marshall Shepherd
      Verified account
      @DrShepherd2013

      2013 AMS Pres, Dir-U of GA Atmos Sciences, Prof, fmr NASA scientist, Alpha, FSU, WeatherChannel WxGeeks host, Forbes Contributor, views mine RT not endorsement

    • Alexandra Witze
      Verified account
      @alexwitze

      Correspondent for Nature. Author, with Jeff Kanipe, of ISLAND ON FIRE, shortlisted for the 2016 PEN/E.O. Wilson Literary Science Writing Award.

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