NASA IS BRAND

Here are some popular NASA hashtags:

1. #NASA - general content related to NASA
2. #Space - for space-related content
3. #Astronomy - for astronomy-related content
4. #Astrophysics - for astrophysics-related content
5. #SpaceExploration - for posts about space exploration missions
6. #RocketLaunch - for posts about rocket launches
7. #InternationalSpaceStation - for content related to the ISS
8. #Mars - for posts about Mars missions or discoveries
9. #Moon - for posts about the Moon and lunar missions
10. #Hubble - for content related to the Hubble Space Telescope

These are just a few examples, and there may be other NASA-related hashtags specific to certain events or projects.