In the past, on Earth, it has largely been to exploit foreign resources and to expand the domestic territory.

The factor most ignored in discussing interstellar flight is the kinetic energy that must be invested in the ship to make its tons of matter move at a substantial fraction of the speed of light.

Antimatter is not a source of energy for us, it's a method of storing energy, compact but inefficient.

If interstellar travel is as time- or energy- demanding as the above figures indicate, it is far from obvious what the motive for colonization might be.

No one can deny the excitement of visiting another world.

Years of science fiction have produced a mindset that it is human destiny to expand from Earth, to the Moon, to Mars, to the stars.

Present annual world energy consumption is about equal to the annihilation energy of 4 tons of matter.

In the past, on Earth, it has largely been to exploit foreign resources and to expand the domestic territory.

It would be a pity if, frustrated by the price of travel, we elected to become a society that never made contact, that never gave SETI a fair chance.

The sun and its retinue of planets drift as a group through the vast gulfs of space that separate the stars.

Above all, I would not expect a wise race, at great expense, to set loose an army of self-replicating robots.

The French are the wittiest, the most charming, and up to the present, at all events, the least musical race on Earth.

My life has been a continuous fulfillment of dreams. It appears that everything I saw and did has a new, and perhaps, more significant meaning, every time I see it. The earth is good. It is a privilege to live thereon.

I believe as human beings we are out of balance, out of synch with the earth.

We are put on this earth to have a good time. This makes other people feel good. And the cycle continues.

All men are by nature equal, made all of the same earth by one Workman; and however we deceive ourselves, as dear unto God is the poor peasant as the mighty prince.

Infuse your life with action. Don't wait for it to happen. Make it happen. Make your own future. Make your own hope. Make your own love. And whatever your beliefs, honor your creator, not by passively waiting for grace to come down from upon high, but by doing what you can to make grace happen... yourself, right now, right down here on Earth.

You know, if you hang around this earth long enough you really see how things come full circle.

With a firm and steadfast mind one should hold under all conditions, that everywhere the earth is below and the sky above, and to the energetic man, every region is his fatherland.

A time will come when men will stretch out their eyes. They should see planets like our Earth.

When I say artist I mean the man who is building things - creating molding the earth - whether it be the plains of the west - or the iron ore of Penn. It's all a big game of construction - some with a brush - some with a shovel - some choose a pen.

Long after this wonderful event in the Earth's history, when the human species was spread over a good deal of Asia, Europe, and Africa, migration to the American continents began in attempts to find new feeding grounds and unoccupied areas for hunting and fishing.

My object will be, first, to show by what connections the history of the fossil bones of land animals is linked to the theory of the earth and why they have a particular importance in this respect.

I just did a picture book called The Wildest Brother on Earth, and you will find both of my children in there.

A good businessman never makes a contract unless he's sure he can carry it through, yet every fool on earth is perfectly willing to sign a marriage contract without considering whether he can live up to it or not.

Government of the people, by the people, for the people, shall not perish from the Earth.

Pick a flower on Earth and you move the farthest star.

I have continued systematically to study the Book of Mormon and Bible to understand even more deeply what God expects of me and my family while on this earth.

Man is a microcosm, or a little world, because he is an extract from all the stars and planets of the whole firmament, from the earth and the elements; and so he is their quintessence.

You think that a wall as solid as the earth separates civilization from barbarism. I tell you the division is a thread, a sheet of glass. A touch here, a push there, and you bring back the reign of Saturn.

For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.

The views of the Earth are really beautiful. If you've ever seen a space IMAX movie, that's really what it looks like. I wish I'd had more time just to sit and look out the window with a map, but our science program kept us very busy in the lab most of the time.

I told the brethren that the Book of Mormon was the most correct of any book on earth, and the keystone of our religion, and a man would get nearer to God by abiding by its precepts, than by any other book.

You see, every creature alive on the earth today represents an unbroken line of life that stretches back to the first primitive organism to appear on this planet; and that is about three billion years.

Who promised you that only for joy were you brought to this earth?

We were given clear concrete tools. The course did a great job demystifying the art of fiction writing and fostering confidence. The instructor brought complex concepts down to earth. I will miss coming here every week.

The greatest explorer on this earth never takes voyages as long as those of the man who descends to the depth of his heart.

It is well that the earth is round that we do not see too far ahead.

There is no country on earth with a stronger tradition of protecting the public's right to know.

But to be the Vicar of Christ, to claim to exercise his prerogatives on earth, does involve a claim to his attributes, and therefore our opposition to Popery is opposition to a man claiming to be God.

You have to be a bastard to make it, and that's a fact. And the Beatles are the biggest bastards on earth.

Welcome, wild harbinger of spring! To this small nook of earth; Feeling and fancy fondly cling, Round thoughts which owe their birth, To thee, and to the humble spot, Where chance has fixed thy lowly lot.

A rose is the visible result of an infinitude of complicated goings on in the bosom of the earth and in the air above, and similarly a work of art is the product of strange activities in the human mind.

Justice, sir, is the great interest of man on earth. It is the ligament which holds civilized beings and civilized nations together.

You didn't hear the angels singing. It was brought down to Mother Earth, which is where it should be. And that led me to a lot of other reading.

It is greater than the stars - that moving procession of human energy; greater than the palpitating earth and the things growing thereon.

There's no sex in Middle Earth.

Shall I not have intelligence with the earth? Am I not partly leaves and vegetable mould myself.

How inappropriate to call this planet Earth when it is quite clearly Ocean.