What is NASA ?

Full-Form of NASA is National Aeronautics and Space Administration (NASA) is an independent agency of the federal government of the United States responsible for the civil space program as well as aeronautics and aerospace research.

National Aeronautics and Space Administration (NASA) 

NASA science focuses on better understanding the Earth through the Earth observation system,  Advancing heliophysics through the efforts of the Heliophysics Research Program of the Science Mission Directorate.

Discovery of objects throughout the solar system with advanced robotic spacecraft missions such as New Horizons.

 And researching astrophysics topics such as the Big Bang through great observatories and related programs.