Tuesday, February 5, 2002: RHESSI (then called HESSI) launched to study solar flares. (RHESSI stands for Reuven Ramaty High Energy Solar Spectroscopic Imager.).
Tuesday, February 5, 2002: RHESSI (then called HESSI) launched to study solar flares. (RHESSI stands for Reuven Ramaty High Energy Solar Spectroscopic Imager.).