NEW YORK: The US space agency NASA celebrated the 25th anniversary of the start of work on the International Space Station (ISS) with a ceremony on Wednesday, reported German news agency (dpa).

NASA Deputy Chief Executive Bob Cabana and ISS Programme Manager Joel Montalbano spent around half an hour on the phone with the astronauts and cosmonauts currently stationed on the ISS – seven men and women from the US, Denmark, Japan and Russia.