This Franklin Fact is by Derrick Pitts, Chief Astronomer at The Franklin Institute.

With a casual glance at the night sky, stars may appear to be only white, but a closer look reveals that stars actually have color. Stellar colors are the visual indicator of how a star lives its life. For example, red stars have the lowest temperatures and live longest, while blue stars are the hottest and burn out quickly. Our yellowish sun is an average temperature star - about 10,000oF.

Colors also indicate stars' age and speed as they move through the galaxy, just some of the topics we'll be discussing on SkyTour.

Join me and my co-host Martin Wells for our award-winning radio astronomy program, SkyTour, tonight at 8pm on WHYY 91FM. We'll be broadcasting live from North Penn High School in Lansdale, Pennsylvania. For more information, check our website at

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