Pale Blue Dot

Pale Blue Dot is a photograph of planet Earth taken on February 14, 1990, by the Voyager 1 space probe from a record distance of about 6 billion kilometers (3.7 billion miles, 40.5 AU), as part of the Family Portrait series of images of the Solar System.

In the photograph, Earth's apparent size is less than a pixel; the planet appears as a tiny dot against the vastness of space, among bands of sunlight scattered by the camera's optics.

Voyager 1, which had completed its primary mission and was leaving the Solar System, was commanded by NASA to turn its camera around and take one last photograph of Earth across a great expanse of space, at the request of astronomer and author Carl Sagan.

Background

On September 5, 1977, NASA launched Voyager 1, a 722-kilogram (1,592 lb) robotic spacecraft on a mission to study the outer Solar System and eventually interstellar space. After encountering the Jovian system in 1979 and the Saturnian system in 1980, the primary mission was declared complete on November 20 of the same year. Voyager 1 was the first space probe to provide detailed images of the two largest planets and their major moons.

Faves.com

Faves was a social bookmarking and networking software that installs a single browser button for users to "fave" a webpage, making a link to the page part of their Faves profile. Until October 2007, Faves was called Blue Dot. As of January 2012, the service has migrated to fave.net, and later on migrated to MaxiConnect.com and is no longer active on faves.com which says "Faves is evolving to social couponing."

Features

While offering a service similar to the better-known del.icio.us, Faves had a wider range of functionality that encouraged interaction with "friends" in rating the content of linked webpages. When a registered user visited their Faves home page, they saw a summary of the bookmarks, called "Faves" by the company, that had been most recently shared by their friends.

In addition to features shared with other bookmarking and social bookmarking services, Faves provided an in-page dialog for saving a Fave, thumbnails generated from the page, dynamic voting, and topic-based auto-generated favorites pages.

Carl Sagan

Carl Edward Sagan (/ˈseɪɡən/; November 9, 1934 – December 20, 1996) was an American astronomer, cosmologist, astrophysicist, astrobiologist, author, science popularizer, and science communicator in astronomy and other natural sciences. His contributions were central to the discovery of the high surface temperatures of Venus. However, he is best known for his contributions to the scientific research of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. Sagan assembled the first physical messages that were sent into space: the Pioneer plaque and the Voyager Golden Record, universal messages that could potentially be understood by any extraterrestrial intelligence that might find them.

He published more than 600 scientific papers and articles and was author, co-author or editor of more than 20 books. Sagan wrote many popular science books, such as The Dragons of Eden, Broca's Brain and Pale Blue Dot, and narrated and co-wrote the award-winning 1980 television series Cosmos: A Personal Voyage. The most widely watched series in the history of American public television, Cosmos has been seen by at least 500 million people across 60 different countries. The book Cosmos was published to accompany the series. He also wrote the science fiction novel Contact, the basis for a 1997 film of the same name. His papers, containing 595,000 items, are archived at The Library of Congress.

The Pale

The Pale (An Pháil in Irish) or the English Pale (An Pháil Shasanach or An Ghalltacht), was the part of Ireland that was directly under the control of the English government in the late Middle Ages. It had been reduced by the late 15th century to an area along the east coast stretching from Dalkey, south of Dublin, to the garrison town of Dundalk. The inland boundary went to Naas and Leixlip around the Earldom of Kildare, towards Trim and north towards Kells. In this district, many townlands have English or French names.

History

The Norman invasion of Ireland, beginning in 1169, brought much of Ireland briefly under the theoretical control of the Plantagenet Kings of England. From the 13th century onwards, the Hiberno-Norman occupation in the rest of Ireland at first faltered, then waned. Across most of Ireland the Normans increasingly assimilated into Irish culture after 1300. They made alliances with neighbouring autonomous Gaelic lords. In the long periods when there was no large royal army in Ireland, the Norman lords, like their Gaelic neighbours in the provinces, acted as effectively independent rulers in their own areas.

Blue

Blue is the colour between violet and green on the optical spectrum of visible light. Human eyes perceive blue when observing light with a wavelength between 450 and 495 nanometres. Blues with a higher frequency and thus a shorter wavelength gradually look more violet, while those with a lower frequency and a longer wavelength gradually appear more green. Pure blue, in the middle, has a wavelength of 470 nanometres. In painting and traditional colour theory, blue is one of the three primary colours of pigments, along with red and yellow, which can be mixed to form a wide gamut of colours. Red and blue mixed together form violet, blue and yellow together form green. Blue is also a primary colour in the RGB colour model, used to create all the colours on the screen of a television or computer monitor.

The modern English word blue comes from Middle English bleu or blewe, from the Old French bleu, a word of Germanic origin, related to the Old High German word blao. The clear sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. When sunlight passes through the atmosphere, the blue wavelengths are scattered more widely by the oxygen and nitrogen molecules, and more blue comes to our eyes. Rayleigh scattering also explains blue eyes; there is no blue pigment in blue eyes. Distant objects appear more blue because of another optical effect called atmospheric perspective.