Second docking adapter for commercial crew vehicles installed on International Space Station

The International Space Station is now more than ready for crew-carrying spacecraft flown by commercial companies to pay it a visit: The second planned International Dock Adapter (IDA) was installed on the Space Station during a spacewalk by NASA astronauts Nick Hague and Andrew Morgan earlier today. The dock adapter is actually IDA-3, as the first IDA was lost during the SpaceX launch failure of its CRS-7 mission on June 28, 2015. IDA-2, which was intended to be the second installed on ISS, instead became the first and was delivered in July 2016 during the SpaceX CRS-9 resupply mission.