61. ScienceNet - Physics - Astronomy Questions Physics Astronomy. general Astronomy Questions. Number, Question, Level.p00088d, annulus? . p00204d, Is the spin of the planets slowing down? -. http://www.sciencenet.org.uk/database/Physics/Lists/astronomy.html

General Astronomy Questions Number Question Level Is there any one location in the world that is better for observing than any other? And are there any locations in the U.K. that are better than any other? Are there signs of alien species in space? If the Big Bang theory of the creation of the universe is correct, is the rate of expansion increasing or decreasing? Will it eventually stop expanding and start contracting leading to the collapse of the Universe to a singularity? And then, would this lead to a new Big Bang and a new universe? How fast is the Universe expanding and is it doing so in all directions? If the universe is constantly expanding, and the light from its edge takes billions of years to reach us, how can we ever see the real size of the universe? Hasn't it got bigger by the time we see the light? How is the Hubble constant worked out? What is the temperature of space? If light travelled faster than the speed of light at the big bang how would this affect our view of the universe? The universe is always said to be expanding, but exactly what is it expanding into?

62. Astronomy 161: The Solar System Overview with historical background and basic astronomy concepts, details about planets, satellites, Category Science Astronomy Solar System...... Revolution and Rotation of planets; Conservation of Angular Momentum; The Originof the Theories of Formation. The Planet Mercury general Features of Mercury; The http://csep10.phys.utk.edu/astr161/lect/

Astronomy 161 The Solar System In this semester of Astronomy we shall concern ourselves primarily with the Solar System. As an introduction to that, we shall consider the historical development of our modern picture of the Solar System. Introduction A Sense of Time and Scale in the Universe Precursors to Modern Astronomy Overview of the Sky and Planets ... ASTRONOMY 162 LECTURES Next Back Top Home Help

63. General Features Of Pluto general Features of Pluto led to some speculation that Pluto is not really a planetbut instead an escaped moon of one of the gas giant planets, most likely http://csep10.phys.utk.edu/astr161/lect/pluto/features.html

General Features of Pluto Pluto is on a highly elliptical orbit at an average separation of almost 40 A. U. from the Sun, with an orbital period of 248 years. Since the planet was only discovered in 1930, we have observed only a portion of its orbit so far. Further, the orbit is tilted by about 17 degrees relative to the plane of the ecliptic, much more than for any other planet. Its equatorial radius of 1150 km is only 20% of that of the Earth, and its mass is only 0.0025 that of the Earth. Thus, it is by far the smallest planet, either in mass or diameter. Its period of rotation appears to be almost 6 1/2 days. The 9th Planet or the 8th Planet? Because of the eccentricity of Pluto's orbit, its orbit lies inside that of Neptune for the period from 1979 to 1999. Thus, strictly, Pluto isn't even the most distant planet at present, as illustrated in the following diagram. Of course, we term it the 9th planet because its average separation from the Sun (length of semimajor axis) is greater than that for Neptune. What is Pluto?

64. The Planets In General The planets in general. There are nine major planets in our Solar System and theseare objects of great interest to amateur and professional astronomers alike. http://www.evangelical-anjar.org/astromania/My Webs/mywebs/astromania/the univer

The planets in general There are nine major planets in our Solar System and these are objects of great interest to amateur and professional astronomers alike. Of the nine, five are bright objects and can fairly easily be distinguished from the ‘fixed stars’ even without telescope. The patterns of the stars change so slowly that no appreciable difference will be noticed by several generations of observations. The plants on the other hand do appear to move and although this motion is relatively slow, their position against the background stars will, in some cases alter noticeably from night to night. In fact if a planet close to us passes relatively near to a bright star, its changing position will be apparently over a couple of hours. The motions of all the planets will be quite obvious after observing for a few weeks, with the most distant ones appearing to move the least. Ancient astronomers noticed the movement of these five bright objects, hence the name ‘planets’ meaning ‘wonderers’. The ancients did not know three of the other planets, being remote and rather faint. The remaining one of the nine is, of course, our own Earth. The basic motions of the planets, although apparently complex, are easily explained. All of these bodies are in orbit around the Sun but two of them, namely Mercury and Venus, have smaller orbits than the Earth and are closer to the Sun. They complete their orbits in less time than the Earth’s orbital period of one year because they do not have so far to travel and orbital speed increases as distance from the Sun decreases. Consequently, both these planets will at certain times be found on the opposite side of the Sun to the Earth and, since the orbits of all the planets lie in roughly the same plane, they will then appear very close to the Sun in the sky. They are not actually close, but appear to be so purely because of their alignment. This is called ‘superior conjunction’ and is a very unfavorable time to look for them.

65. ThinkQuest Library Of Entries general There are nine planets in our Solar System, and each is very unique. Lookat the data table below for more general information on all the planets. http://library.advanced.org/26220/solarsystems/

Welcome to the ThinkQuest Internet Challenge of Entries The web site you have requested, Think Space , is one of over 4000 student created entries in our Library. Before using our Library, please be sure that you have read and agreed to our To learn more about ThinkQuest. You can browse other ThinkQuest Library Entries To proceed to Think Space click here Back to the Previous Page The Site you have Requested ... Think Space click here to view this site A ThinkQuest Internet Challenge 1999 Entry Click image for the Site Languages : Site Desciption ThinkSpace is designed to teach people about space. Using the Internet style of learning we created a web page that would be both informative and fun for the internet user. There are five main sections to the page: Stars, Galaxies, Solar System, Universe, and Astronomers. In each of these main sections we enable the user to expand upon their present knowledge. It is our hope that the users will help our site grow by taking part in the interactive sections of the site. We have included two areas where users may add pictures to a gallery and submit samples of their creative writing as it relates to topics about space. Additionally our chat program will allow the user to discuss and exchange ideas on a global basis. The web site is supplemented by a comprehensive popup glossary, search engine, message board, guestbook, and interactive games. Students Ryan Lakeland High School NY, United States

66. Welcome To NSSDC's General Public Page NSSDC Pages Created at general Public's Request. Trajectories of Selected Spacecraft,planets, and Comets Other K12 Question Answer Space Science Sites. http://nssdc.gsfc.nasa.gov/nssdc/gen_public.html

Welcome to NSSDC's General Public Page! T HIS PAGE is intended to guide members of the general public to NASA/NSSDC data and services most likely to be of interest to the non-researcher/scientist segment of the internet community. Our Role T HE National Aeronautics Space Administration (NASA) carries out its functions through several offices. NASA's Office of Space Sciences sponsors the National Space Science Data Center (NSSDC). NSSDC is primarily responsible for the archiving of space science data from past, present, and future NASA missions. We serve the science community and the general public in areas related to the space sciences (astrophysics and astronomy, solar physics, space plasma physics, lunar and planetary science). N SSDC is not intended as, nor is it, an encyclopedic source of information about NASA, its space activities, or space science in general. We provide data, and such information as we happen to have. There are many alternative sources of information about NASA, its activities, and space; several of these are identified below. Access to NSSDC's online WWW files, data, and information is free; nominal charges are made for dissemination of data on media, as, for instance, NSSDC's Planetary Images CD-ROM. NSSDC Pages Most Frequently Visited by the Public Photo Gallery Popular and frequently requested pictures of planets, stars, and spacecraft

67. Science: General Issues Planets & Asteroids Anthropology Biology Life On Mars? F Science general Issues planets asteroids Anthropology Biology Life on Mars? Sciencegeneral Issues planets asteroids Anthropology Biology Life on Mars? http://www.poemmarket.co.uk/Fred-Hoyle-Life-on-Mars-1854570412.html

Title: Life on Mars? Author: Fred Hoyle J M Synge Playboy of the Weste... Sophie Treadwell Machinal... Terence Rattigan French withou... Dermot Bolger Dublin Bloom... ... Rostock gestern. Kal-38901306...

68. General Planetary Science general Planetary Science. Beatty, J. Kelly and Chaikin, Andrews (Eds.). Cattermole,Peter. Earth and Other planets Geology and Space Research. 1995. http://www.ericweisstein.com/encyclopedias/books/GeneralPlanetaryScience.html

General Planetary Science Beatty, J. Kelly and Chaikin, Andrews (Eds.). The New Solar System, 3rd ed. Cambridge, England: Cambridge University Press, 1990. 326 p. Now out in 4th ed. Beatty, J. Kelly; Petersen, Carolyn Collins; and Chaikin, Andrew (Eds.). The New Solar System, 4th ed. Cambridge, England: Cambridge University Press, 1990. 432 p. $31.96. Brandt, John C. and Hodge, Paul W. Solar System Astrophysics. 290 p. $23.95. Cattermole, Peter. Earth and Other Planets: Geology and Space Research. 1995. 160 p. $39.95. Consolmagno, J. and Schaefer, Martha W. Worlds Apart: a Textbook on Planetary Sciences. 1993. 323 p. $50.20. Encrenaz, Therese and Bibring, Jean-Pierre. The Solar System, 2nd ed. Berlin: Springer-Verlag, 1995. 368 p. $59.50. Frazier, Kendrick. Solar System. Alexandria, Va.: Time-Life Books, 1985. 176 p. $?. Gehrels, Tom (Ed.). Planets, Stars and Nebulae; Studied with Photopolarimetry. Tucson, AZ: University of Arizona Press, 1974. $66. Hess, Wilmot N. and Mead, Gilbert D. (Eds.). Introduction to Space Science, 2nd ed., rev. and enl.

69. Icarus Key Words IMAGE PROCESSING, PLANETESIMALS, VENUS, INTERIOR. IMPACT PROCESSES,planets, general, VENUS, SURFACE. INFRARED OBSERVATIONS, PLUTO, VOLCANISM. http://icarus.cornell.edu/information/keywords.html

Cornell University Editorial Office Home Information Papers Submission The Journal Links ... Help path: information keywords.html ICARUS KEY WORDS ABUNDANCES, ATMOSPHERES IONOSPHERES RADAR ABUNDANCES, INTERIORS INVITED PAPERS, PRIZE LECTURES RADIATION CHEMISTRY ACCRETION RADIATIVE TRANSFER AERONOMY JOVIAN PLANETS RADIO OBSERVATIONS ASTEROIDS JUPITER REGOLITHS ASTEROIDS, CERES; EROS;GASPRA; IDA; MATHILDE; VESTA; JUPITER, ATMOSPHERE RESONANCES ASTEROIDS, COMPOSITION JUPITER, INTERIOR ROTATIONAL DYNAMICS ASTEROIDS, DYNAMICS JUPITER, MAGNETOSPHERE ASTEROIDS, ROTATION SATELLITES, ATMOSPHERES ATMOSPHERES, COMPOSITION KUIPER BELT OBJECTS SATELLITES, GENERAL ATMOSPHERES, DYNAMICS SATELLITES OF JUPITER ATMOSPHERES, EVOLUTION MAGNETIC FIELDS SATELLITES OF MARS ATMOSPHERES, STRUCTURE MAGNETOSPHERES SATELLITES OF NEPTUNE AURORAE MARS SATELLITES OF SATURN MARS, ATMOSPHERE SATELLITES OF URANUS CALLISTO MARS, CLIMATE SATURN CELESTIAL MECHANICS MARS, INTERIOR SATURN, ATMOSPHERE CENTAURS MARS, SURFACE SATURN, INTERIOR CHARON MERCURY SATURN, MAGNETOSPHERE COLLISIONAL PHYSICS METEORITES SETI COMETS METEOROIDS SOLAR NEBULA COMETS, COMPOSITION

70. General Relativity Here you will find heaps of mathematical derivations and info on general Relativity(GR), astrophysical implications of GR, data on planets of the Solar System http://www.home.gil.com.au/~praxis/gr/

Hi there! This page is dedicated to my favourite area of physics. Here you will find heaps of mathematical derivations and info on General Relativity (GR), astrophysical implications of GR, data on planets of the Solar System, and comments on all things astrophysical. Although there will be quite a bit of text, this page is meant to be more of a mathematical source of information. As a final note, this page is under construction. In fact, you'll probably find sections with no info! I get to update this page a few times a year, so come back once in a while. :) General Relativity (and a treatment of tensors) This section of my site on deals with Albert Einstein's General Theory of Relativity. This section is continuing to expand as I learn more new and interesting things about GR. I get to do most of my reading in the summer holidays, so you can propably expect this section to get updated about once a year. Please note that this site is still under construction, so some of the links won't work yet! This section is meant to be an online reference to General Relativity, providing a 'no frills' approach. It is more of a summary, with derivations of just about every single equation included. By "summary," I mean that I do not go into detail explaining every single step. I assume, for example, that the reader fully understands the Einstein summation convention, and is familiar with any references made to Special Relativity. But don't let this warning scare you! Read on - there are things which will interest even the most casual reader.

71. Curious About Astronomy? General Physics Earth is the same force which keeps the Earth and other planets in orbit The twingoliaths of 20th century theoretical physics general relativity and quantum http://curious.astro.cornell.edu/physics.php

Credit: Lawrence Berkeley National Laboratory Catching neutrinos from the Sun. The Sudbury Neutrino Observatory (SNO) is hardly your average physics experiment: buried in a 2000 meter deep mine in Ontario and filled with 1000 tons of heavy water, its purpose is to catch neutrinos, spritely particles which form in the center of the Sun and usually fly through the Earth without being captured. Recent results from this experiment have solved a long-standing discrepancy; we now know that the number of neutrinos observed from the Sun is equal to the predictions of theoretical nuclear physics and that neutrinos can oscillate between three different "flavors" during the course of their trip. General Physics Links Questions Although our website is about astronomy, we receive many questions that are related, in whole or in part, to the science of physics. This isn't a surprise, because astronomy and physics are intimately tied together. Physics is the study of the laws that govern the universe, and to the best of our knowledge, those laws are the same here and now as they were long ago and far away. In order to explain what we see in the night sky, therefore, we appeal to theories originally developed to explain physical phenomena on the Earth. Conversely, the extreme environments encountered in astrophysical situations provide a "laboratory" to test these theories under conditions that we could never hope to recreate ourselves.

72. SATURN - ENCHANTED LEARNING SOFTWARE general INFORMATION ON SATURN, Saturn is the sixth planet from thesun in our solar system. It is the secondlargest planet in our http://www.enchantedlearning.com/subjects/astronomy/planets/saturn/

Help save Enchanted Learning: Don't let it go the way of the dinosaurs. Click here for more information on our honor system. $20.00/year or other amount (directly by Credit Card $20.00/year (transaction via PayPal Other Amount (transaction via PayPal The Planets Zoom Astronomy SATURN General Description Inside Saturn and the Atmosphere Rings ... Activities, Web Links GENERAL INFORMATION ON SATURN Saturn is the sixth planet from the sun in our solar system. It is the second-largest planet in our solar system (Jupiter is the largest). It has beautiful rings that are made mostly of ice chunks (and some rock) that range in size from the size of a fingernail to the size of a car. Saturn is made mostly of hydrogen and helium gas. Saturn is visible without using a telescope, but a low-power telescope is needed to see its rings. SIZE AND SHAPE Saturn is about 74,898 miles (120,536 km) in diameter (at the equator at the cloud tops). This is about 9.4 times the diameter of the Earth . 764 Earths could fit inside a hollowed-out Saturn. Saturn is the most oblate (flattened) planet in our Solar System. It has a equatorial diameter of 74,898 miles (120,536 km) (at the cloud tops) and a polar diameter of 67,560 miles (108,728 km). This is a difference of almost 10%. Saturn's flattened shape is probably caused by its fast rotation and its gaseous composition.

73. Planets, Stars, Galaxies And More numbers, computers, biology, general science, aviation etc. 10. Jan 2003. ScienceFiction 17. Additional general scientific resources of the Internet. http://www.lb.shuttle.de/apastron/

AD ASTRA... (means: to the stars / zu den Sternen) (founded on 31. Dec 1998, last notable update 10. Jan 2003) viewable by ANY browser! CONTENTS (astronomy and physics) [2. Jun 2002] numbers, computers, biology, general science, aviation etc. [10. Jan 2003] Science Fiction [17. Dec 2000] Section Society etc. [27. Oct 2002] Celebrities: Gabriela Sabatini, Pamela Anderson, Kristen Cloke and more [6. Jan 2003] Search my site: The main intention of this homepage is to present interesting links of scientific and computational interest not only for scientists along with an evaluation of the presented sites and - if necessary - a few remarks about the contents. Some further scientific, especially astronomical and physical informations are also given. Besides a few other scientific and technical/computational topics further a few non-scientific themes are discussed especially about the societies of the USA and Germany and my opinions are presented, alongside with related matters, finally an even more non-scientific matter is discussed: (prominent) people (especially women) and the Internet. I choose English as language, because it's a World Wide Web... But a few sections are in German, where I consider this as appropriate (for example, if I discuss a homepage in German) and these are marked with the german flag:

74. This Page Has Moved Ask an Astronomer. general Astronomy Solar System. BACK. How far awayis the Moon from the Earth? Are the colors of the planets important? http://sirtf.caltech.edu/Education/Ask/solarsys.html

This Page Has Moved The URL you requested has been moved. Please update your bookmarks. If your browser does not automatically redirect you, you can find the new site at http://sirtf.caltech.edu/EPO/ask/solarsys.shtml

75. Science: Chemistry Articles Science general. about this site. Back to Science main site, Methods of archaeology;New planets, new life? Ocean ice; Perceptual psychology Nativism vs. http://www.essortment.com/in/Science.General/

Science: General about this site Back to Science main site Find A Site A lessen on the layers of the Earth Anatomy of human nervous system Archimedes principals Basic math made easy ... Your weight on other planets © 2002 Pagewise, Inc.

76. Your Title Here general Creation Dinosaurs Physical Science Energy Electricity Light Weather/ MeteorologyEarth Science Oceanography Plants /Botany Rocks/Geology planets/ http://homeschoolunitstudies.com/Resources/humanbody.htm

OUR BEST SELLERS For Parents MESSAGE BOARD! Why Homeschool How to Homeschool Charlotte Mason ... Worldviews Bible Study Tools Chronological Bibles Bible Tools K-4 Bible Tools 5-12 World History General Adam to Abraham Mesopotamia Ancient Egypt ... Reformation American History History of the US Exploration Pilgrims-Colonies Colonies-Country ... Holocaust Science (Creation Order) General Creation Dinosaurs Physical Science ... The Human Body Husbandry (Life Skills) Wisdom Diligence Personal Economics College ... Citizenship Language Arts Phonics English Writing Hebrew ... Mindmapping Biographies General Sower Series Missionaries Click on Books Below to View Sample Lessons Ancient History: Adam to Messiah Wisdom: An Internet- Linked Unit Study A Family Guide to The Biblical Holidays The Heart of Wisdom Teaching Approach NEW HOW Online Store HOW Teaching Approach HOW Unit Studies Homeschool Information Homeschool Resources Biblical

77. General Considerations For A Mars Mission general considerations for a Mars Mission. Eccentricity According to Kepler's Laws, the planets revolve in elliptical orbits in which the Sun is at one of its http://www.marsacademy.com/traj/traj2.htm

Newton's Law of Gravitation General considerations for a Mars mission Orbits From Earth to Mars Getting to Low Earth Orbit From Low Earth Orbit to Mars ... Earth-Mars Java Tracker General considerations for a Mars Mission The mean distance between the Earth and Mars is approximately of 78,300,000 km., that is, roughly half the distance from the Earth to the Sun. As compared to the Moon, our boldest step in manned exploration so far, which is some 380,000 km away, Mars is at more or less 200 times the distance. The following table shows some orbital parameters of the Earth, Mars and Venus : Orbital Comparison Mars Venus Earth Distance to Sun: 1.52 AU 0.72 AU 1.00 AU Mean: 227,900,000 km 108,200,000 km 149,600,000 km Max: 250,000,000 km 109,000,000 km 152,200,000 km Min 206,500,000 km 107,400,000 km 147,100,000 km Eccentricity Period 686.98 days 224.70 days 365.26 days Inclination: Several important conclusions can be drawn from the above table: Celestial bodies that will influence the trajectory: The orbital mechanics of the mission will be influenced gravitationally by the nearby celestial bodies. In the case of an Earth-Mars mission, the Earth, Mars and the Sun will be primary factors due to mass (in the case of the Sun) and proximity (Earth and Mars) As it can be seen from the table, Venus is sufficiently near to exert its influence. Probably many of the trajectories to be considered will lie very close to Venus and thus be greatly influenced by its gravitational field.

78. SpaceRef - Astronomy - Planets - Mars - Facts Mars Information This website provides a solid collection of general planetaryinformation and imagery, part of The Nine planets hosted by Students for the http://www.spaceref.com/directory/astronomy/planets/mars/facts/

SpaceRef About Us Advertising Comments Thursday, April 10, 2003 SpaceRef Calendar Directory Gallery Press Releases Space Station Space Weather Status Reports Astrobiology Web (The) Mars Today Mars TV SpaceRef Canada SpaceRef Japan SpaceRef Research Advertisement Home Calendar News Gallery ... Chris Anderson's Mars Site - This site contains links to Mars-related sites several of which the author found useful when researching a novel about the first manned trip to Mars. Exploring Mars With Books and Weblinks - Information and links regarding factual and fictional descriptions of Mars - and Martian life. Mars Atlas - An interactive atlas of Mars constructed from Viking Orbiter images - Center for Mars Exploration - NASA Ames Research Center. Mars Facts - This site provides general planetary information and imagery as part of Views of the Solar System Mars Geoscience Navigator - A service of NASA's Planetary Data System that can be used to Navigator to locate, display, download, and order geoscience data products from various Mars missions, Washington University, St. Louis, Missouri Mars in the Mind of Earth - A set of ongoing bibliographies of Terran literature concerning the Planet Mars - SF/NASA/ARPA Digital Library Project - University of Michigan.

79. NGC # For Planets And Moon - An Astronomy Net General Forum Message NGC For planets And Moon Forum List Follow Ups Post Message Backto Thread Topics Posted by Bruno on August 14, 2000 010934 UTC. http://www.astronomy.net/forums/general/messages/2858.shtml?show=top

80. Planets With No Stars In Sky? - An Astronomy Net General Forum Message planets With No Stars In Sky? Forum List Follow Ups Post 29, 2001 2043 UTC planets are to stars as stars are to galaxies http://www.astronomy.net/forums/general/messages/3415.shtml?show=top

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