Takashi Okajima@takashiokajoma56friendsadd Takashi宇宙やってます🇯🇵🇺🇸 NASA Astrophysicist @ Goddard Space Flight Center X-ray optics, Space science, Satellite missions, Balloon experiments, High energy astrophysics, Black holes, Neutron stars, Active galactic nuclei, Clusters of galaxies