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.

Some of the most innocuous inventions have proven earth-shattering, with reverberations felt around the planet. The Internet is the poster child for disruptive technology, but even such inventions as Amazon's Kindle and Apple's iPod have rocked their respective industries by changing how we entertain ourselves.

I'm fortunate to have viewed our Earth from the moon and that vision has convinced me that technology and commitment will conquer any challenge.

Whether one welcomes or deplores it, nothing is more surely and exactly characteristic of modern times than the irresistible invasion of the human world by technology. Mechanism invading like a tide all the places of the earth and all forms of social activity.

I have an almost religious zeal... not for technology per se, but for the Internet which is for me, the nervous system of mother Earth, which I see as a living creature, linking up.

My vision is for a fully reusable rocket transport system between Earth and Mars that is able to re-fuel on Mars - this is very important - so you don't have to carry the return fuel when you go there.

I was told to challenge every spiritual teacher, every world leader to utter the one sentence that no religion, no political party, and no nation on the face of the earth will dare utter: 'Ours is not a better way, ours is merely another way.

Developing our sympathetic compassion is not only possible but the only reason for us to be here on earth.

Here bring your wounded hearts, here tell your anguish; Earth has no sorrow that Heaven cannot heal.

The domesticated chicken is probably the most widespread bird in the annals of planet Earth. If you measure success in terms of numbers, chickens, cows and pigs are the most successful animals ever.

Gene Roddenberry continually reminded us that the Star Trek Enterprise was a metaphor for starship Earth. And the strength in this starship came from its diversity, coming together and working in concert as a team. That is the strength of our countries, Canada and the United States. We are nations of diversity.

It was a really interesting thing to explore, the strength it takes for someone to stay when they truly do not want to be on this Earth anymore.

The pagan loves the earth in order to enjoy it and confine himself within it; the Christian in order to make it purer and draw from it the strength to escape from it.

Sports are one of the main cultural activities on the face of the earth.

Homophobia in male sports is much stronger than in women's sports; the locker room environment is a lot different. It's going to be much more of a brave step, an earthshaking move, for a gay male athlete to come out.

I think my appeal is that I've always tried to stay very grounded to my fans and to be accessible - not being this unattainable thing. I think doing sports and riding motorcycles has made me more approachable and more real and down to earth.

If leaders in the space program had at its beginning in the 1940s, pointed out the benefits to people on earth rather than emphasizing the search for proof of evolution in space, the program would have saved $100 billion in tax money and achieved greater results.

If you're going to go into space, you have to have an objective, a mission. Where do you want to go? Earth orbit? The moon? Mars? What's the technology to get there? You develop the technology for the mission.

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.

I think the International Space Station is providing a key bridge from us living on Earth to going somewhere into deep space.

Scripture suggests that the elements in space were created for the benefit of earth, while evolution suggests that earth is an insignificant speck in vast space.

But thanks to the International Space Station, we're able to study the effects of weightlessness and develop countermeasures in orbit, close to Earth.

Google Earth is an incredible resource because from hundreds of miles in space, we can zoom in, and we can find things. Everyone always looks for their house first. That is the tip of the iceberg with remote sensing.

A radio telescope pointing at the sky receives radiation not only from space, but also from other sources including the ground, the earth's atmosphere, and the components of the radio telescope itself.