The only technology that can 'see' beneath the ground is radar imagery. But satellite imagery also allows scientists to map short- and long-term changes to the Earth's surface. Buried archaeological remains affect the overlying vegetation, soils and even water in different ways, depending on the landscapes you're examining.

During the past few decades, modern technology, with radio, TV, air travel, and satellites, has woven a network of communication which puts each part of the world in to almost instant contact with all the other parts.

A satellite has no conscience.

The density of space junk peaks around 620 miles up, in the middle of so-called low-Earth orbit. That's bad, because many weather, scientific, and reconnaissance satellites circle in various low-Earth orbits.

We have spent billions to go to the moon - we go to this lesser satellite called the moon and say we are in space, but we are in space right now; we just don't feel ourselves to be in space. Some forms of art and some forms of spirituality do give us that sense.

The rockets and the satellites, spaceships that we're creating now, we're pollinating the universe.

Streaming TV shows, movies, and other types of video over the Internet to all manner of devices, once a fringe habit, is now a squarely mainstream practice. Even people still paying for cable or satellite service often also have Netflix or Hulu accounts.

I founded a launch company called International Microspace when I graduated medical school in 1989. We were trying to build a microsatellite launcher.

The space industry is developing and delivering benefits that tie into our immediate needs and priorities here on Earth-for example, medical and materials research, and satellite communications.

What satellites help to show us is we've actually only found a fraction of a percent of ancient settlements and sites all over the world... It's the most exciting time in history to be an archaeologist.

Satellites record data in different parts of the light spectrum that we can't see. And it's that information that allows satellites to be so powerful in terms of looking at things like vegetation health, finding different kinds of geology that may indicate an oil deposit or some kind of mineralogical deposit that can be mined.

I made a lot of money. I earned a lot of money with CNN and satellite and cable television. And you can't really spend large sums of money, intelligently, on buying things. So I thought the best thing I could do was put some of that money back to work - making an investment in the future of humanity.

The Long Island experience is so strange. You're a satellite around the city, so the presence of the city is always looming.

I have a satellite radio show called 'The Legends of Reggae.' It's a cool way to branch out and do other things. I'm paying respect to the legends of reggae.

Airplanes don't just disappear - certainly not these days with all the powerful communication systems, radio and satellite tracking, and filmless cameras which operate almost indefinitely and possess huge storage capacities.

GPS is expensive because it is a very slow communication channel - you need to communicate with three or four satellites for an extended duration at 50 bits per second.

Canada's a huge country, so to be able to unite the country through communication satellite technology or to be able to observe it through remote sensing technology from space is a natural fit for a country like Canada.

As a geek, I take umbrage at the notion that chips are not sexy. But yes, robots, drones, satellites and self-driving cars are the kinds of things that excite me.

I could have become a mass murderer after I hacked my governor module, but then I realized I could access the combined feed of entertainment channels carried on the company satellites. It had been well over 35,000 hours or so since then, with still not much murdering, but probably, I don't know, a little under 35,000 hours of movies, serials, books, plays, and music consumed. As a heartless killing machine, I was a terrible failure.

And it came to me then. That we were wonderful traveling companions but in the end no more than lonely lumps of metal in their own separate orbits. From far off they look like beautiful shooting stars, but in reality they're nothing more than prisons, where each of us is locked up alone, going nowhere. When the orbits of these two satellites of ours happened to cross paths, we could be together. Maybe even open our hearts to each other. But that was only for the briefest moment. In the next instant we'd be in absolute solitude. Until we burned up and became nothing.

The point of that is if you look at Walgreen's history they've always been pioneers in the application of technology. They're the only drugstore chain that I know to have their own satellite.

One hardly knows where in the history of science to look for an important movement that had its effective start in so pure and simple an accident as that which led to the building of the great Washington telescope and went on to the discovery of the satellites of Mars.

A satellite has no conscience.

The space industry is developing and delivering benefits that tie into our immediate needs and priorities here on Earth-for example medical and materials research and satellite communications.