The Keys to Communicating with Other Worlds explores how electromagnetic waves traveling at the speed of light turn astronomical telescopes into time machines. As we peruse the flickering lights from distant heavens and peer into deep space, we see billions of years into the past. Conventional scientific wisdom provides for a hypothetical elementary particle, the graviton that governs gravitational interaction. After years of searching, it remains to be found. As a result that long-standing theory never has been proven. Until we find the real-time communications link, we may continue to miss the aliens real-time information highway. Availability: Usually ships in 2-3 business days.