H.R. 5503, the National Aeronautics and Space Administration Authorization Act of 2018 Introduced 115th Congress April 13, 2018 Bill Status: Introduced H.R. 5503, the National Aeronautics and Space Administration Authorization Act of 2018, can be found here. Permalink: https://republicans-science.house.gov/2018/4/hr-5503-national-aeronautics-and-space-administration-authorization-act-2018