space elevator

Tourism is the act of travel for the purpose of recreation, and the provision of services for this act. A tourist is someone who travels at least eighty kilometres (fifty miles) from home for the purpose of recreation, as defined by the World Tourism Organization (a United Nations body). A more comprehensive definition would be that tourism is a service industry, comprising a number of tangible and intangible components. The tangible elements include transport systems - air, rail, road, water and now, space; hospitality service ...

Including:

• Tourism - Tourism Classification
• Tourism - Required factors
• Tourism - History
• Tourism - Health tourism & leisure travel
• Tourism - Winter tourism
• Tourism - Mass travel
• Tourism - International mass tourism
• Tourism - Recent developments
• Tourism - Special forms of tourism
• Tourism - Trends

Read more here: » Tourism: Encyclopedia - Tourism

Charles Sheffield (June 25, 1935 – November 2, 2002), was an English-born mathematician, physicist and science fiction author. He had been a President of the Science Fiction and Fantasy Writers of America and of the American Astronomical Society. His novel The Web Between the Worlds, featuring the construction of a space elevator, was published almost simultaneously with Arthur C. Clarke's novel about that very same subject, The Fountai ...

Including:

• Charles Sheffield - Bibliography incomplete
• Charles Sheffield - Novels
• Charles Sheffield - Non-Fiction
• Charles Sheffield - Collections
• Charles Sheffield - Short Stories

Read more here: » Charles Sheffield: Encyclopedia - Charles Sheffield

Canada - Mexico - South Africa - U.S. Rail Transport - Science - Sports Births - Deaths 1895 (MDCCCXCV) was a common year starting on Tuesday (see link for calendar) of the Gregorian calendar (or a common year starting on Thursday of the 12-day-slower Julian calendar). 1895 - Events. 1895 - January. January 5 - Dreyfus Affair: French officer Alfred Dreyfus is stripped of his rank and sentenced to life imprisonment on Devil's Island. < ...

Including:

• 1895 - Events
• 1895 - January
• 1895 - February
• 1895 - March
• 1895 - April
• 1895 - May
• 1895 - June
• 1895 - July
• 1895 - August
• 1895 - September
• 1895 - November
• 1895 - December
• 1895 - Unknown date
• 1895 - Births
• 1895 - January-March
• 1895 - April-June
• 1895 - July-September
• 1895 - October-December
• 1895 - Deaths
• 1895 - Date unknown

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According to the narrative in Genesis Chapter 11 of the Bible, the Tower of Babel was a tower built by a united humanity in order to reach the heavens. To prevent the project from succeeding, God confused their languages so that each spoke a different language. They could no longer communicate with one another and the work could not proceed. After that time, people moved away to different parts of Earth. The story is used to explain the existence of many different languages and races. Tower of Babel - Narrative. Including:

• Tower of Babel - Narrative
• Tower of Babel - Historicity
• Tower of Babel - Linguistic context
• Tower of Babel - The Tower
• Tower of Babel - In other scripture
• Tower of Babel - The destruction
• Tower of Babel - Jubilees
• Tower of Babel - Midrash
• Tower of Babel - Apocalypse of Baruch
• Tower of Babel - Qur'an
• Tower of Babel - Book of Mormon
• Tower of Babel - Popular culture and Modern influence
• Tower of Babel - In Music
• Tower of Babel - In literature
• Tower of Babel - In computer and video games

Read more here: » Tower of Babel: Encyclopedia - Tower of Babel

A sunshade is a variation on an umbrella, used for thousands of years to shade people from the Sun. Megastructure sunshades in orbit have been proposed by science fiction writers and more recently are becoming serious engineering proposals. In theory a sunshade with a diameter of 130 miles can be orbited at an altitude of 10,000 to 15,000 miles which is a solar synchronous orbit. The sunshade would produce a continuous solar eclipse which would circle Earth's tropic zone continuously. This sunshade would reduce the solar ...

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The Mars trilogy is a series of three science fiction novels by Kim Stanley Robinson, chronicling the settlement and terraforming of the planet Mars. The novels are Red Mars (1992), Green Mars (1993) and Blue Mars (1996). An additional collection of short stories was published as The Martians (1999). Mars trilogy - Awards. Red Mars won the BSFA Award in 1992 and the SFWA's Nebula Award in 1993. Green Mars won the Hugo Award in 1994. Blue M ...

Including:

• Mars trilogy - Awards
• Mars trilogy - Plot
• Mars trilogy - Characters
• Mars trilogy - Other characters
• Mars trilogy - Quotes

Read more here: » Mars trilogy: Encyclopedia - Mars trilogy

Sir Arthur Charles Clarke (born December 16, 1917) is a British author and inventor, most famous for his science-fiction novel 2001: A Space Odyssey, and for collaborating with director Stanley Kubrick on the film of the same name. Clarke is considered one of the Big Three of science fiction, along with Robert A. Heinlein and Isaac Asimov. 2001: A Space Odyssey was written concurrently with the film version by Stanley Kubrick. It was loosely inspired by Clarke's short story "The Sentinel", but became its own novel ...

Including:

• Arthur C. Clarke - Biography
• Arthur C. Clarke - Bibliography
• Arthur C. Clarke - Themes style and influence
• Arthur C. Clarke - The adapted screenplays of Arthur C. Clarke
• Arthur C. Clarke - 2001: A Space Odyssey
• Arthur C. Clarke - 2010: The Year We Make Contact
• Arthur C. Clarke - Rendezvous with Rama
• Arthur C. Clarke - Essays and short stories

Read more here: » Arthur C. Clarke: Encyclopedia - Arthur C. Clarke

As of August 2005, four Challenges have been announced: the Tether Challenge, the Beam Power challenge, the Moon Regolith Oxygen (MoonROx) Challenge, and the Astronaut Glove Challenge. Each of these challenges are being done in collaboration with an outside organization. Further challenges are still being planned. Centennial Challenges - Tether Challenge. This competition, being done in partnership with the Spaceward Foundation[1], has the challenge of constructing super-strong tethers, a crucial component ...

See also:

Centennial Challenges, Centennial Challenges - Challenges, Centennial Challenges - Tether Challenge, Centennial Challenges - Beam Power Challenge, Centennial Challenges - Moon Regolith Oxygen MoonROx Challenge, Centennial Challenges - Astronaut Glove Challenge, Centennial Challenges - Suborbital Payload Challenge, Centennial Challenges - Suborbital Lunar Lander Analog Challenge, Centennial Challenges - Telerobotic Construction Challenge, Centennial Challenges - Planetary Unmanned Aerial Vehicle Challenge, Centennial Challenges - Other proposals, Centennial Challenges - Origin, Centennial Challenges - Budget

Read more here: » Centennial Challenges: Encyclopedia II - Centennial Challenges - Challenges

Clarke was born in Minehead in Somerset, England, and as a boy enjoyed stargazing and enthusiastically read old American science-fiction magazines (many of which made their way to England as ballast in ships). After secondary school, and studying at Richard Huish College, Taunton he was unable to afford a university education and consequently acquired a job as an auditor in the pensions section of the Board of Education. During the Second World War, he served in the Royal Air Force as a radar specialist and was involved in the early w ...

See also:

Arthur C. Clarke, Arthur C. Clarke - Biography, Arthur C. Clarke - Bibliography, Arthur C. Clarke - Themes style and influence, Arthur C. Clarke - The adapted screenplays of Arthur C. Clarke, Arthur C. Clarke - 2001: A Space Odyssey, Arthur C. Clarke - 2010: The Year We Make Contact, Arthur C. Clarke - Rendezvous with Rama, Arthur C. Clarke - Essays and short stories

Read more here: » Arthur C. Clarke: Encyclopedia II - Arthur C. Clarke - Biography

Fictional works describe all the countries in the following list as located somewhere on the surface of the Earth as we know it — as opposed to inside the planet, on another world, or during a different "age" of the planet (see below). Note: for inclusion in this list, the country should be notable enough to have a separate article. See List of fictional countries for a longer list. Aeaea: mythical island in Greek mythology, home of the sorceress Circe Alagaësia: the fantasy land in which the Chr ...

See also:

Fictional country, Fictional country - Incomplete list of fictional countries, Fictional country - Lands in Tarzan series by Edgar Rice Burroughs, Fictional country - Lands in the Tintin stories by Hergé, Fictional country - Lands in Gulliver's Travels by Jonathan Swift, Fictional country - Lands inside the Earth, Fictional country - Lands of Robert E. Howard, Fictional country - Lands of Arda and Middle-earth, Fictional country - Lands of the DC Comics universe, Fictional country - Lands of the Marvel Comics universe, Fictional country - Not on Earth, Fictional country - Semi-fictional countries, Fictional country - Franchise nations from Neal Stephenson's Snow Crash, Fictional country - Questionable cases, Fictional country - Books

Read more here: » Fictional country: Encyclopedia II - Fictional country - Incomplete list of fictional countries

Jack was a poor boy whose lack of common sense often drove his widowed mother to despair. One day she sent him to the market to sell their last and only possession, a cow, but along the way, Jack met a stranger who offered to trade it for five "magic beans". Thrilled at the prospect of owning magic beans Jack made the deal without hesitation. Alas his mother turned out to be less than thrilled when he arrived back home. She threw the beans straight out of the window and sent Jack to bed without dinner. Overnight however, the seeds grew into ...

See also:

Jack and the Beanstalk, Jack and the Beanstalk - Plot synopsis, Jack and the Beanstalk - Origins

Read more here: » Jack and the Beanstalk: Encyclopedia II - Jack and the Beanstalk - Plot synopsis

There are two lunar-synchronous points where the elevator could be placed that would be stable: the Lagrange points L1 and L2. L1 on the Earth side of the Moon is 56,000 km up from the surface, and L2 on the far side is 67,000 km up. In these positions, the forces of gravity and centrifugal force equalize, and as long as the system remained balanced, it would remain stationary. Both of these positions are substantially farther up than the 36,000 km from Earth to geostationary orbit. Furtherm ...

See also:

Lunar space elevator, Lunar space elevator - Location, Lunar space elevator - Fabrication

Read more here: » Lunar space elevator: Encyclopedia II - Lunar space elevator - Location

Elliptical orbits can be and are designed for communications satellites that keep the satellite within view of its assigned ground stations or receivers. A satellite in an elliptical geosynchronous orbit will appear to oscillate in the sky from the viewpoint of a ground station, tracing an analemma in the sky. Satellites in highly elliptical orbits must be tracked by steerable ground stations. Theoretically an active geosynchronous orbit can be maintained if forces other than gravity are also used to maintain the orbit, ...

See also:

Geosynchronous orbit, Geosynchronous orbit - Circular geosynchronous orbits, Geosynchronous orbit - Other geosynchronous orbits, Geosynchronous orbit - History

Read more here: » Geosynchronous orbit: Encyclopedia II - Geosynchronous orbit - Other geosynchronous orbits

Solar power satellite - Launch costs. Without a doubt, the most obvious problem for the SPS concept is the currently immense cost of space launches. Current rates on the Space Shuttle run between $3,000 and $5,000 per pound ($6,600/kg and $11,000/kg), depending on whose numbers are used. In either case the concept of building a structure some kilometres on a side is clearly out of the question ...

See also:

Solar power satellite, Solar power satellite - History, Solar power satellite - Description, Solar power satellite - Problems, Solar power satellite - Launch costs, Solar power satellite - Safety, Solar power satellite - SPS's economic feasibility, Solar power satellite - Current work, Solar power satellite - External link

Read more here: » Solar power satellite: Encyclopedia II - Solar power satellite - Problems

Since the trilogy covers over 200 years of human history, later immigrants and the children and grandchildren of the first hundred eventually become important characters in their own rights. Nirgal, the son of Hiroko and the Coyote is raised communally by Hiroko and her followers. He is a good-natured wanderer who eventually becomes a political leader advocating ties with Earth. Jackie Boone, the granddaughter of Hiroko and John Boone (raised with Nirgal), emerges as an isolationist leader, presented as ma ...

See also:

Mars trilogy, Mars trilogy - Awards, Mars trilogy - Plot, Mars trilogy - Characters, Mars trilogy - Other characters, Mars trilogy - Quotes

Read more here: » Mars trilogy: Encyclopedia II - Mars trilogy - Characters

Tower of Babel - Linguistic context. The name Babylon is from Akkadian Bāb-ilu, which means Gate of God. Its Hebrew version however, Babel, sounds similar to balal, which means to confuse or confound in Hebrew. According to the documentary hypothesis, the passage derives from the Jahwist source, a writer whose work is full of puns, and like many of the other puns in the Jahwist text, the element of the story concerning the scattering of languages may just be a folk etymology for the name Babel, attached t ...

See also:

Tower of Babel, Tower of Babel - Narrative, Tower of Babel - Historicity, Tower of Babel - Linguistic context, Tower of Babel - The Tower, Tower of Babel - In other scripture, Tower of Babel - The destruction, Tower of Babel - Jubilees, Tower of Babel - Midrash, Tower of Babel - Apocalypse of Baruch, Tower of Babel - Qur'an, Tower of Babel - Book of Mormon, Tower of Babel - Popular culture and Modern influence, Tower of Babel - In Music, Tower of Babel - In literature, Tower of Babel - In computer and video games

Read more here: » Tower of Babel: Encyclopedia II - Tower of Babel - Historicity

There are four potential ways to use tethers for propulsion. Tether propulsion - Tidal stabilization. An attitude control tether has a small mass on one end, and a satellite on the other. Tidal forces stretch the tether between the two masses. There are two types of tidal forces: In one, the upper part of an object goes faster than its natural orbital speed, so centrifugal force stretches the object upwards. The lower part moves slower than the orbital speed, so it pulls down. The other tidal force is that ...

See also:

Tether propulsion, Tether propulsion - Usage, Tether propulsion - Tidal stabilization, Tether propulsion - Electrodynamic tethers, Tether propulsion - Rotovators, Tether propulsion - Skyhooks, Tether propulsion - Beanstalks or Space Elevators, Tether propulsion - Problems, Tether propulsion - In Fiction

Read more here: » Tether propulsion: Encyclopedia II - Tether propulsion - Usage

Wealthy people have always travelled to distant parts of the world to see great buildings or other works of art; to learn new languages; or to taste new cuisine. As long ago as the time of the Roman Republic places such as Baiae were popular coastal resorts for the rich. The terms tourist and tourism were first used as official terms in 1937 by the League of Nations. Tourism was defined as people travelling abroad for periods of over 24 hours. Tourism - Health t ...

See also:

Tourism, Tourism - Tourism Classification, Tourism - Required factors, Tourism - History, Tourism - Health tourism & leisure travel, Tourism - Winter tourism, Tourism - Mass travel, Tourism - International mass tourism, Tourism - Recent developments, Tourism - Special forms of tourism, Tourism - Trends

Read more here: » Tourism: Encyclopedia II - Tourism - History

The Space Fountain acts as a continuous mass driver with captive projectiles travelling in a closed loop. In the Hyde design for a Space Fountain a stream of projectiles is shot up through the bore of a hollow tower. As the projectiles travel upward through the tower they are slowed down by electromagnetic drag devices that extract kinetic energy from the upgoing stream and turn it into electricity. As the projectiles are braked they also transfer some of their upward momentum to the tower structure, exerting a lifting force to suppor ...

See also:

Space fountain, Space fountain - History, Space fountain - Design, Space fountain - Construction, Space fountain - Safety measures, Space fountain - Variants, Space fountain - Near-term applications

Read more here: » Space fountain: Encyclopedia II - Space fountain - Design

1895 - January. January 5 - Dreyfus Affair: French officer Alfred Dreyfus is stripped of his rank and sentenced to life imprisonment on Devil's Island. 1895 - February. February 11 - The lowest ever UK temperature of -27.2°C (measured as -17°F) was recorded at Braemar in Aberdeenshire. This record was equalled in 1982. February 14 - First showing of Oscar Wilde's last play The Importance of Being Earnest (St. Ja ...

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1895, 1895 - Events, 1895 - January, 1895 - February, 1895 - March, 1895 - April, 1895 - May, 1895 - June, 1895 - July, 1895 - August, 1895 - September, 1895 - November, 1895 - December, 1895 - Unknown date, 1895 - Births, 1895 - January-March, 1895 - April-June, 1895 - July-September, 1895 - October-December, 1895 - Deaths, 1895 - Date unknown

Read more here: » 1895: Encyclopedia II - 1895 - Events