Humanity's first steps on the Moon.
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Today Phil’s explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots stars’ luminosity versus temperature, and most stars fall along the main sequence, where they live most of their lives.
Saturn is the crown jewel of the Solar System. Using the latest discoveries, some of the world's top experts seek to unravel the mystery of why its extensive ring system exists and if any of its many moons could harbor alien life.
Our galaxy is full of stars ready to explode into supernovas, a stellar detonation powerful enough to destroy all life on Earth; it's an event that hasn't occurred in 400 years, and the search is on to locate which star may be next.