 Additionally, C-SPAN simulcasts NASA Space Shuttle mission launches and landings live, using video footage and audio sourced from NASA TV.With its public affairs programming, C-SPAN intends to offer different viewpoints by allowing time for multiple opinions to be discussed on a given topic.For example, in 2004 C-SPAN intended to televise a speech by Holocaust historian Deborah Lipstadt adjacent to a speech by Holocaust denier David Irving, who had unsuccessfully sued Lipstadt for libel in the United Kingdom four years earlier; C-SPAN was criticized for its use of the word "balance" to describe the plan to cover both Lipstadt and Irving.