1) Russia
2) China
3) Japan
4) Kazakhstan
Explanation:
On July 13, 2019 The Russian space agency has successfully launched Proton-M rocket carrying the Spektr-RG(Spectrum Roentgen Gamma) space telescope from the Baikonur Cosmodrome in Kazakhstan. Joint Project: The Spektrum-Röntgen-Gamma mission, also known as Spektr-RG, is a joint project developed by Russian space agency, Roscosmos, and the German space agency, DLR create a three-dimensional (3D) X-ray map of the universe and expected to detect 100,000 galaxy clusters, 3 million black holes, tens of thousands neutron stars, and magnetic fields.