John Grunsfeld

@SciAstro

Former 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
197 Photos and videos Photos and videos

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  1. Retweeted
    5 hours ago

    We can’t let uranium mining destroy Arizona’s natural treasures. We have to protect the environment for future generations.

    73 replies 837 retweets 5,479 likes
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  2. 5 hours ago

    Here is an Op-Ed I penned. Please vote tomorrow for and

    10 replies 34 retweets 94 likes
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  3. 5 hours ago

    Roughly 4 years ago Donald Trump ruined Twitter for me. His lies and misleading statements have become his hallmark achievement. Someone recently said "Silence is not an option" and that has finally resonated with me. I appreciate that you've kept me in your scan. (1/2)

    4 replies 14 retweets 79 likes
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  4. Retweeted
    11 Jan 2018

    Check out this brand new 3D fly-through of the Orion Nebula in both visible and infrared light! For the full video head to:

    162 replies 2,553 retweets 6,614 likes
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  5. 15 Sep 2017

    Press conference starting now for

    2 replies 4 retweets 10 likes
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  6. 15 Sep 2017

    is dead. Long live !!! Just an incredible mission and team.

    2 replies 41 retweets 52 likes
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  7. 15 Sep 2017

    Right up to the end is sending data. Minutes to go.

    1 reply 17 likes
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  8. Retweeted
    15 Sep 2017

    LIVE NOW: Watch a live stream from mission control

    22 replies 405 retweets 671 likes
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  9. 15 Sep 2017

    Still seeing the signal from even though the spacecraft has already plowed into Saturn. It's that slow speed of light thing.

    6 replies 107 retweets 259 likes
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  10. 14 Sep 2017

    The Grand Finale: a celebration of exploration of our solar system and the mysteries of the Saturnian system. – at Jet Propulsion Laboratory

    1 reply 7 retweets 21 likes
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  11. Retweeted
    14 Sep 2017

    Walk through final steps of mission in this interactive story of the dive into :

    27 replies 1,019 retweets 2,115 likes
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  12. Retweeted
    23 Jul 2017

    Today in 1972 began 45 years of Earth science observations & returning stunningly beautiful images of our home planet.

    22 replies 404 retweets 1,038 likes
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  13. Retweeted
    5 Jun 2017

    Protecting our environment is not a luxury we can choose to enjoy, but a simple matter of survival.

    586 replies 50,507 retweets 108,455 likes
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  14. 27 May 2017

    Back from a 9 hour flight on observing . Now the hard work of data analysis can begin.

    1 reply 4 retweets 23 likes
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  15. 26 May 2017

    taking off. Back in about 9 hours after a big circle over the Pacific Ocean looking for plumes of water on

    1 reply 4 retweets 24 likes
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  16. 26 May 2017

    Tonight's observations on the will be the 400th flight!

    8 retweets 31 likes
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  17. 26 May 2017

    Off to climb on for a night of observing . The instrument ready to go.

    2 retweets 13 likes
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  18. 26 May 2017

    So far we're a go for Europa on tonight. A good luck owl to send us off in the hangar.

    3 replies 8 retweets 66 likes
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  19. 26 May 2017

    To learn about go to The quick story: a 747 aircraft with a big hole in it and a 2.4m telescope

    7 likes
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  20. 26 May 2017

    All looks good for our flight on tonight to observe Looking for plumes of water.

    4 retweets 12 likes
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