Russia's Proton-M carrier rocket with the Spektr-RG space observatory lifts off from the launchpad at the Baikonur Cosmodrome in Kazakhstan on July 13, 2019. (ROSCOSMOS PHOTO)

MOSCOW, July 13 (Xinhua) -- The Spektr-RG space observatory, onboard the Russian Proton-M carrier rocket, was successfully launched into orbit on Saturday, Russia's state space corporation Roscosmos said in a statement.

The spacecraft was launched from the Baikonur cosmodrome in Kazakhstan earlier in the day, which was the second launch of this type of launch vehicle in 2019, according to the statement.

The orbital observatory, equipped with two unique X-ray mirror telescopes, has begun its 100-day flight to explore the universe in the X-ray electromagnetic radiation, the statement said.

Spektr-RG is a Russian project with German participation, the main goal of which is to build a map of the whole sky with the registration of about 100,000 largest clusters of galaxies and three million supermassive black holes, according to Roscosmos.