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But it remains pretty mind-boggling to me, perhaps because I'm old enough to remember how difficult and expensive it once was just to place an old-fashioned analog long-distance phone call from the East Coast to California. This cover also keeps the differential oil in place and lubricates the moving parts. Representing all parts of the United States and Canada, they gathered at the Detroit Coliseum, newly decorated by the famed Walter Dorwin Teague. To calculate your power needs, you need to add up the normal and surge wattage figures for all of the devices you want to operate simultaneously. Since then, solar cells have evolved from transforming sunlight into usable electricity for huge, expensive space equipment to more down-to-earth devices like battery chargers. By the late 1970s and early 80s, Nokia was making the world's first commercial radio phones and car phones, cumbersome devices weighing a few pounds each. Picking out that mind-bogglingly faint signal from the irrepressible cacophony of space and making sense of it might be as difficult as, say, finding a message floating in a bottle somewhere in the Earth's oceans.

Since then, I've gotten a bit more used to our ever-increasing connectivity; the other day, I actually spent a half-hour exchanging a stream of back-and-forth e-mails with an old colleague who now lives in France, what is electric cable only to be interrupted by an instant message from another friend in the north of England. So I look forward to the inevitable day when I'll be exchanging witticisms and complaining about the weather with someone who's in orbit above me. Satellites normally orbit planets in Keplerian orbits, named after the 17th century astronomer Johannes Kepler, who wrote the mathematically equations that describe how satellites move. In order to stay in that position, however, the satellites would have to counteract the effects of gravity, which would pull them toward Mars. Let's assume you have found an exceptionally fine hair with a width of 60 micrometers. But the European and British researchers have proposed putting a pair of communications satellites around Mars in something called a non-Keplerian orbit, which basically means that instead of moving in a circular or elliptical path around Mars, they'd be off to the side a bit, so that the planet wouldn't be at the center. The way they would do it, admittedly, is a little tough for a non-physicist to fathom: A spacecraft capable of receiving communications transmissions would be positioned in interstellar space opposite the direction that the starship is going, about 51 billion miles (82 billion kilometers) away from the sun.

In the previous item on this list, we mentioned the concept of a bread-crumb-like trail of communications links that the starship would leave in its wake. The news of the deal was explosive, and overnight Bell Telephone leapt into the communications arena as a preeminent power. The communications craft would then use the sun as a lens to magnify the signals it gets from the distant starship, and then would transmit them back to Earth though some other system, such as a network of satellites with laser links. They came up with one intriguing solution: Along the way, the massive ship would periodically jettison empty fuel canisters equipped with signal relay equipment, forming a chain that would pass back messages from the spacecraft to Earth. I got a little shock a few years back, when I contacted a source for an article by e-mail, and got a call back from him -- via Skype -- from Afghanistan, where he had traveled for a business project.

That's a pretty good way to do things, as long as all that information moves along at high speed with few delays or lost packets of data, which isn't that tough to do on Earth. Since similar charges repel one another, the fur moves as far away from the base of the material and other strands of fur as it possibly can, causing the strands to stand on end. If you're looking for a metaphor on Earth, imagine how your laptop computer, tablet, smartphone, game console, webcam and home entertainment center could all link into your wireless Internet router and share content with one another. Then a slim, brilliant shaft of light appeared, focused at center stage. Two of them -- the heavily insulated black and red lines -- are attached to the tops of a parallel pair of exposed heavy copper bars, called buses, at the center of the box. Not so fast. Any landscape analysis should take those lines into account -- especially when planning tree patterns and growth. We transfer information via laser every day, whether by reading CDs and DVDs, scanning bar codes at checkout lines or tapping the fiber optic backbone of phone or Internet services.