An expanded version was broadcast on NBC in the USA on April 4 , 1973 , on NBC , attracting 51 % of the television viewing audience .
An expanded version was was seen in more American households than the July 1969 Moon landing .
An expanded version was broadcast on NBC in the USA on April 4 , 1973 , on NBC , attracting 51 % of the television viewing audience , and was seen in more American households than the July 1969 Moon landing .