Ricky Arnold: Teacher and Astronaut by Staff May 8, 2020 May 8, 2020 45 views 45NASA astronaut Ricky Arnold takes an out of this world “space-selfie” while conducting a spacewalk on March 29, 2018.Source: nasa.gov 0 FacebookTwitterPinterestEmail previous post Memory Sizes Explained: Gigabytes, Terabytes, and Petabytes in Context next post What Is an Intel NUC? What to Know and Why You Might Want One