Today marks the 37th anniversary of the lunar landing of Apollo 11 and Neil Armstrong’s first steps and first words on the lunar surface. The event was captured in glorious black and white for a worldwide TV audience measured in the billions. The decades-long Cold War space race is recalled in the repeat airing of the two-part series “Space Race” (National Geographic). Part one, “Secret Weapons,” airs at 6 p.m. followed by part two, “Race for the Moon” at 8 p.m.

¢ Less than five years after NASA pulled the plug on the Apollo project, the world turned its eyes to space once again. But this time it was the old-fashioned fantasy of “Star Wars,” the movie that would propel actor Harrison Ford from a character actor to a household star. Ford’s story unfolds on “Fame” (10 p.m., Biography).

Ford, born in 1942, was well into his 30s when the role of Han Solo came along. “Fame” follows his rise to become one of Hollywood’s leading men in such films as “Raiders of the Lost Ark,” “Witness,” “The Fugitive,” “Air Force One” and “Clear and Present Danger.” Ford will reprise his role as Indiana Jones in the franchise’s fourth incarnation.

¢ Tonight’s battle between “Grey’s Anatomy” (8 p.m., ABC) and “CSI” (8 p.m., CBS) offers a taste of the fall schedule. “CSI” has been television’s most popular show since that forensics drama debuted in fall 2001. Only two years old, “Grey’s Anatomy” was supposed to get a boost from its post-“Desperate Housewives” timeslot, but it surprised everybody when the hospital soap opera’s audience quickly eclipsed that of the Wisteria Lane farce.

The match-up between “CSI” and “Grey” has inspired commentary at the TV-critics tour, with a CBS executive putting his top-rated network in the role of the “underdog.” Of course, tonight’s competition may be affected by the presence of the results show of “America’s Got Talent.” The quirky “Star Search” reincarnation, hosted by Regis Philbin, has emerged as the summer’s most-watched program.

Tonight’s other highlights

¢ Julie Chen hosts “Big Brother: All-Stars” (7 p.m., CBS).

¢ Making up for bad Christmas mornings on “My Name is Earl” (7 p.m., NBC).

¢ Olympic gold-medalist Oksana Baiul performs on “Master of Champions” (7 p.m., ABC).

¢ Chris seeks refuge on “Everybody Hates Chris” (7 p.m., UPN).

¢ An odor emanates from Michael’s office on “The Office” (7:30 p.m., NBC).

¢ The results are read on “America’s Got Talent” (8 p.m., NBC).

¢ The results are read on “So You Think You Can Dance” (8 p.m., Fox).

¢ The results are read on “America’s Got Talent” (8:30 p.m., NBC).

¢ A troubled and possibly dangerous genius vanishes on “Without a Trace” (9 p.m., CBS).

¢ A sudden flight to Belgium on “Windfall” (9 p.m., NBC).