133 Days on the Sun

As of my last knowledge update in September 2021, NASA doesn't typically use hashtags in the same way that social media platforms do. However, they often use specific keywords, phrases, and mentions to categorize and promote their content on social media platforms like Twitter, Instagram, and YouTube. These keywords and mentions help users find their content related to specific missions, events, or topics.

For the most accurate and up-to-date information on how NASA uses tags, keywords, or hashtags on social media, I recommend visiting NASA's official social media accounts or their website. Social media practices can change over time, so checking their official channels would provide you with the most current information.