If New York is the “Big Apple” and New Orleans the “Big Easy,” Houston is known as “Space City.” That all began almost six decades ago, when NASA decided to open the manned spacecraft center there and put Houston on the map. Michelle Miller reports. Source

Tens of millions are facing record-setting high temperatures this weekend. Also, President Trump changes his tone about the crowd at his North Carolina rally who chanted “send her back.” All that and all that matters in today’s Eye Opener. Your world in 90 seconds. Source

Protests against Puerto Rico Gov. Ricardo Rossellò have been ongoing for several days Source

From the fiery blast of a Saturn rocket to those first steps on the lunar surface, images from America’s space program are etched in the nation’s collective memory. But along with those sights, there are the sounds: the words that also tell the remarkable story of human achievement. With insight from historian Douglas Brinkley and CBS News space analyst Bill Harwood, “CBS This Morning Saturday” reflects on some of the mission’s most memorable moments. Source

Saturday marks 50 years since the greatest technological achievement in human history: At 4:17 in the afternoon Eastern time, a spacecraft carrying astronauts Neil Armstrong and Buzz Aldrin touched down on the moon. Nearly seven hours later, with an estimated half a billion people watching on TV, Armstrong descended from the lunar module to take mankind’s first steps on the moon’s surface. Even now, NASA’s Apollo 11 mission continues to inspire America’s next steps into space. Source

Britain is warning Iran of what it describes as “serious consequences” if Iran does not release a tanker that it seized in the Persian Gulf. Iran claims the tanker collided with an Iranian fishing boat in the Strait of Hormuz. Germany and France have also called on Iran to release it. David Martin reports. Source

President Trump is now defending his supporters who chanted “send her back” at a rally earlier this week in reference to freshman congresswoman Ilhan Omar. Less than 24 hours after attempting to disavow the chant, which was widely condemned as racist, Trump called his supporters “incredible patriots” and upped his attacks on Omar. Omar is calling herself the president’s “nightmare.” Ben Tracy reports. Source

A dangerous and deadly heat wave is gripping almost half of the nation. Tens of millions are set to broil in record-setting high temperatures this weekend, and heat advisories or warnings are in effect from the Midwest to much of the East Coast. Coupled with high humidity, the heat index will exceed 100 degrees in New York and other major cities. The heatwave is already blamed for at least six deaths. Natalie Brand reports. Source

Bob Cusak, editor-in-chief of The Hill, joins “CBS This Morning Saturday” to discuss President Trump’s feud with Rep. Ilhan Omar and how it will impact swing voters. Cusak also discussed what Democrats are hoping to get out of Special Counsel Robert Mueller’s upcoming testimony. Source

Doctors are prescribing low doses of hormones — “microdoses” — as more individuals begin to identify as non-binary. Calvin Gilbert, a nurse practitioner at Lyon-Martin health services in San Francisco, joined CBSN to discuss the growing trend. Source