Category Archives: time

The Prodigious Sun

Is the Sun an efficient producer of energy via nuclear fusion?

While humanity may be years away from commercializing nuclear fusion power, the Sun has been doing it for a while now (and for free!). The Sun is the most efficient generator of nuclear power in our solar system. Inside the Sun, nuclear reactions are happening at a seemingly impossible rate. Hide your kids and hide your wife though, because eventually the Sun is going to run out of Hydrogen and will no longer be able to produce these reactions. When this happens, about 5 billion years from now, will humanity have come up with a way to circumvent the destruction of our society that would come as a result? It took us less than 2000 years to get to sliced bread, so I’m confident we’ll come up with something.

5 Billion Years From Now


Faster than you can say, “3.0 times ten to the eighth meters per second”



photo from here

When I was young, I read a biography of Einstein’s life. (If he wasn’t so brilliant, we might know him as Honest Al). In this book, a story was told about young Albert at the ship docks. A worker had Al stand 50 yards away from him and swung a hammer at an anvil. Einstein learned from this experience an awesome wonder for the speed of sound and light. The rest is history.

What really interests me about the speed of light is how it allows us to peek into the past. When we look out into space, we are not seeing what is, but what was. Here is an experiment I would like to see done – Blake and Chris are standing 3.1 miles away, the point where the earth’s surface curves out of sight, and Blake lights a fire. Let’s say Chris is standing on a cell tower. As soon as Blake lights the fire, he says into his cell phone, “Chris, it’s lit.” Does Chris hear the cell phone first or see the fire first? If he does see the light first, how far away would he have to get in order to hear Blake first?