Transcription: Good evening. I want to begin by introducing you to two stars. One is so bright you can't miss it. It's vaguer, almost overhead in the evenings now. It's very bright and it's very blue. Now the other one is much less obvious. First of all find the Great Bear and from that you find another part of the constellation, a triangle of stars there, one of which is decidedly red. Just away from that triangle are two faint stars And this one is 47 C majors. Now, why should that be a special star? And why Vega? The answer is that Vega possibly, and 47 certainly, is the center of a system of planets. Now ...