NASA Television marks the 20th anniversary of on-orbit operations of the Hubble Space Telescope with a documentary that premieres Monday, April 26 at 2 p.m. EDT. It will re-air at 4 p.m., 8 p.m. and 10 p.m.

“Hubble: 20 Years of Discovery” celebrates the achievements of one of the most popular and important scientific instruments in the history of exploration. Narrated by actor and writer Brent Spiner, this special video presentation takes viewers on a journey back in time and into the farthest reaches of the cosmos.

Hubble’s discoveries have revolutionized nearly all areas of current astronomical research, from planetary science to cosmology, and its images are unmistakably out of this world.

Spiner is best known for his portrayal of Lt. Commander Data, the sentient android in the iconic “Star Trek: The Next Generation” television series and films.

“Hubble: 20 Years of Discovery” also will be featured on NASA’s Internet homepage http://www.nasa.gov and the agency’s popular You Tube channel.

For more information about NASA TV, a broadcast schedule for the Hubble documentary and other programs, visit: http://www.nasa.gov/ntv

To see videos posted on the NASA TV You Tube channel, visit: http://www.youtube.com/nasatelevision

To learn more about the Hubble Space Telescope and NASA, visit: http://www.nasa,.gov/hubble