... All the Water on Planet Earth . ... 15.05.2012 . ... Although oceans of water cover about 70 percent of Earth's surface, these oceans are shallow compared to the Earth's radius. ... The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth's Moon , but slightly larger than Saturn's moon Rhea which, like many moons in our outer Solar System, is mostly water ice. ... Publications with keywords: Earth - water . Publications with words: Earth - water . ...

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• Fly Over Dwarf Planet Ceres
• XWare > APOD

... Billions of years ago the surface of Mars looked very different than it does today. Where there is now only a dry red desert, there was once an vast ocean that covered about 20% the planet's surface. That means it covered more of the surface of Mars than the Atlantic Ocean covers on Earth! ... So, by looking at how much heavy water is in Mars' atmosphere in comparison to the lighter kind, we can tell how much normal water the planet has lost into space. ...

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• Gaitee Hussain @ ESO
• Planet around Beta Pictoris
• Planets shepherding material into a narrow ring around Fomalhaut

... 2012 May 15 . All the Water on Planet Earth . ... Although oceans of water cover about 70 percent of Earth's surface, these oceans are shallow compared to the Earth's radius. The above illustration shows what would happen if all of the water on or near the surface of the Earth were bunched up into a ball . ... How even this much water came to be on the Earth and whether any significant amount is trapped far beneath Earth 's surface remain topics of research. ... About APOD | ...

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• Astronomical Names
• APOD: 2015 June 10 - Fly Over Dwarf Planet Ceres
• APOD: January 31, 1996 - Planets Around Sun-Like Stars

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

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• The Three Planet System

... Bad Astronomy . ... Mad Science . ... The Nine Planets . ... COULDN'T WE BUILD A SATELLITE THAT WE COULD PLACE IN A FIXED ORBIT AROUND EACH OF THE PLANETS IN THE SOLAR SYSTEM, WE COULD STUDY THE ATMOSPHERE AND SURFACE OF EACH PLANET SIMILAR TO THE WAY IN WHICH WE USE THEM TO WHATCH OUR WEATER OR SPY ON OUR ENEMIES? ... The Mars Global Surveyor is on its way to Mars (expected to reach Mars orbit in a few months) and will also be in a permanent orbit around Mars. ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Misconceptions

... Warped passages: Thursday 16 October 2008 . ... Catch a Falling Star: Thursday 9 October . A stronomy Ireland Colm J. Cannon Memorial lecture: " Searching for Planets Around Other Stars - From Galway " by Gregg Hallinan, at 8 pm, Monday 13 October, in the Physics Building, Trinity College Dublin. ... The techniques used to detect these planets requires the use of very sensitive and expensive equipment. ... Tuesday, 7 October 2008 23:23 . International Year of Astronomy, Ireland National Node . ...

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• Extrasolar Planetary Systems: More Like Ours - by David Perez-Suarez, Armagh
• Armagh Observatory
• Armagh Astropark: The Planets

God Science Forum Message . ... God and Science | ... Pluto Is Not A Planet, But A Moon Of Neptune. ... Pluto Is Not a Planet, but a Moon of Neptune . 60 years ago, at 1947, the late Mohammed Ali Hassan Al-Hilly, said in his book: (The Universe and the Quran), that Pluto is not a planet but a moon of Neptune. ... He said: " Astronomers, however, think that Pluto is a planet, but I say it is merely a moon of Neptune, and actually it is not a planet. ... www.astronomy.net . About Astronomy Net | ...

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• Lunar Libration - an Astronomy Net Article
• Alignment Of 2 Planets - an Astronomy Net Christstar Forum Message
• Moon, Planets And Aurora, Oh My! - an Astronomy Net Article

Ganymede is the largest moon in our solar system, larger even than the planets Pluto and Mercury. ... Ganymede's surface consists of two main types of terrain: old, dark polygonal units, and young, bright valleys and ridges (see figure 11 ). ... In a similar way, hitting a large block of ice with a hammer makes white marks. ... Ganymede as seen by Voyager 2. ... Because Voyager couldn't spot any large impact craters, scientists have concluded that the moon's surface is young. ... Moon . ... Europa . ...

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• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: Miranda: A Jigsaw Puzzle World
• ASP: Up, Up, and Away

... Satellites of the planets are assigned a provisional designation (indicating year of discovery) by the Central Bureau for Astronomical Telegrams ( CBAT ) upon satisfactory demonstration of the existence of a new object. ... In the past, Comets were first given a provisional designation, consisting of the year and a lowercase letter indicating the order of discovery in the year (e.g., 1994a was the first comet discovered or recovered in 1994, 1994b the second, etc.) ... Names .. ...

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• Pluto and Charon
• The Path of the Sun, the Ecliptic
• Venus

... STScI-PRC99-27 A CLOSER ENCOUNTER WITH MARS Taking advantage of Mars's closest approach to Earth in eight years, astronomers using NASA's Hubble Space Telescope have taken the space-based observatory's sharpest views yet of the Red Planet. ... In these views the north polar cap is tilted toward the Earth and is visible prominently at the top of each picture. ... Dark sand dunes that surround the polar cap merge into a large, dark region called Acidalia. ...

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• Dust evolution across the CO snowline in a protoplanetary disk
• Pluto and Charon
• The Planet Jupiter

... Planets . ... Stars . Exoplanets . ... Most exoplanets so far discovered fall into the category of тАШhot JupitersтАЩ, these are giant planets orbiting very close to their parent star. ... Note that we have discovered so many hot Jupiters because they are the easiest type of planet to find, they are not necessarily particularly common in the galaxy. ... Subsequently several similar hot and€а fuzzy worlds have been discovered the same way, proving this that this planet is not a one-off oddball. ...

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• Most Earth-like exoplanet found by ESO | Astronotes
• Kepler-10c: the First Mega-Earth | Astronotes
• COROT-7b: Exoplanet with a sky made of stone | Astronotes

... The study of extra solar planets will be one of the most important areas of research in astronomy in this century. ... The first planets outside the solar system were found in 1992 around the millisecond pulsar PSR B1257+12 by Alex Wolszczan at the Arecibo Observatory . ... Three space missions based on this principle (MOST, COROT and Kepler ) have already been launched or approved, and have the last one at least has the potential to find Earth-sized planets. ... SIM ( NASA ) is one of such missions...