Eyewitnesses who spoke to Russian radio described a scene of carnage after the blast ripped through the baggage claims section of the arrivals hall at Russia's largest airport.

Also on display for the first time is a section of the radio telescope which radio astronomer Jocelyn Bell used to discover pulsars - small, fast-rotating stars - in the 1960s.

This section is the reflection of the current the system of usufruct of radio spectrum resources.