Russian cosmonauts (from L to R) Yuri Malenchenko, Alexei Ovchinin and Oleg Skripochka give a press-conference during a telebridge at International Space Station on Cosmonautics Day in Moscow, Russia, on April 12, 2016. (Xinhua/Evgeny Sinitsyn)

MOSCOW, Aug. 15 (Xinhua) -- Two Russian cosmonauts will spend almost seven hours outside the International Space Station (ISS) on Wednesday to install an antenna as part of a bird monitoring experiment, local news reported.

The two cosmonauts, Oleg Artemyev and Sergei Prokopyev, wearing modern Orlan-MKS space suits, will step out at 16:00 GMT. The mission is expected to last until 22:55 GMT, according to Sputnik news agency.

They will also launch four nanosatellites in orbit and pick up bacteria samples from the external surface of the ISS.

Since the experiment began in 2010, 19 space dust samples have reportedly been delivered to Earth.

Scientists found a strong concentration of holmium in the dust, normally typical of Przybylski's Star in the constellation of Centaurus.