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	Solar system - Wikipedia, the free encyclopedia
		"the Alpha Centauri system" or "the 51 Pegasi system").
		In the outer regions of this solar nebula, ice and volatile gases were able to survive, and as a result, the inner planets are rocky and the outer planets were massive enough to capture large amounts of lighter gases, such as hydrogen and helium.
		The point at which the solar system ends and interstellar space begins is not precisely defined, since its outer boundaries are delineated by two separate forces: the solar wind and the Sun's gravity.
	en.wikipedia.org /wiki/Solar_system (5172 words)

	MSN Encarta - Solar System
		Solar System, the Sun and everything that orbits the Sun, including the nine planets and their satellites; the asteroids and comets; and interplanetary dust and gas.
		The dimensions of the solar system are specified in terms of the mean distance from Earth to the Sun, called the astronomical unit (AU).
		The solar system was the only planetary system known to exist around a star similar to the Sun until 1995, when astronomers discovered a planet about 0.6 times the mass of Jupiter orbiting the star 51 Pegasi.
	ca.encarta.msn.com /encyclopedia_761557663/Solar_System.html (1824 words)

	World Almanac for Kids
		SOLAR SYSTEM, Stellar-planetary unit consisting of the sun; the nine planets and their satellites; asteroids, and meteoroids and, comets; and interplanetary dust and gas.
		The boundary between the solar system and interstellar space-called the heliopause-is estimated to occur near 100 AU.
		Through the end of the 1980s, this solar system was the only planetary system known to exist, although a number of relatively nearby stars had been found to be encircled by swarms of orbiting material of indeterminate size or to be accompanied by suspected brown dwarfs.
	www.worldalmanacforkids.com /explore/space/solarsystem.html (1892 words)

	The Solar System
		The whole solar system, together with the local stars visible on a clear night, orbits the center of our home galaxy, a spiral disk of 200 billion stars we call the Milky Way.
		The solar magnetic field is the dominating magnetic field throughout the interplanetary regions of the solar system, except in the immediate environment of planets which have their own magnetic fields.
		The terrestrial planets are the four innermost planets in the solar system, Mercury, Venus, Earth and Mars.
	www.solarviews.com /eng/solarsys.htm (1562 words)

	The Solar System and its Origins
		Inner Solar System bodies (including the belt asteroids) are rocky bodies, and quite small (none is bigger than the Earth), while the outer Solar System bodies are icy, where they are solid at all.
		This was impossible for the inner planets, both because of the high temperatures (which made it easier for light gas molecules to escape a planet's gravitational field), and the small gravitational masses of the terrestrial planets.
		Specifically, in the inner solar system, the Earth is fairly active geologically, the Moon and Mercury are dead worlds, and Mars and Venus are in between.
	www.ifa.hawaii.edu /faculty/hu/solarsystem.html (1975 words)

	ipedia.com: Comet Article (Site not responding. Last check: 2007-10-29)
		In Earth's solar system, the orbits of comets may extend past that of Pluto; of the comets which enter the inner solar system, most have relatively highly elliptical orbits.
		Comets are thought of as debris left over from the condensation of a solar nebula; it is generally argued that the outer edges of such nebulae are cool enough that water exists in a solid (rather than gaseous) state.
		Both coma and tail are spectacularly illuminated by the Sun and are sometimes visible from the Earth when a comet passes through the inner solar system, the dust reflecting sunlight directly and the gases glowing due to ionization.
	www.ipedia.com /comet.html (1621 words)

	Inner_Solar_System (Site not responding. Last check: 2007-10-29)
		Solar energy is 6.7 times more intense at Mercury, therefore a silicon solar panel or foil solar thermal collector can gather almost seven times as much energy from a given area as would a solar panel at Earth's distance from the Sun or on the Moon.
		On airless Mercury or in solar orbit at that distance robotic factories will be rich in electricity and solar energy for direct application to smelting and melting of metals for casting or alloying.
		Upon entry into the inner system the barges would just unfurl their rolled up solar sails and energize their mag-sails and brake for free into orbit around Mercury or Venus or space colonies in solar orbit and unload their hydrogen cargo.
	www.moonminer.com /Inner_Solar_System.html (1913 words)

	Asteroids Caused The Early Inner Solar System Cataclysm
		Evidence that main belt asteroids pummeled the early inner solar system confirms a previously published cosmochemical analysis by UA planetary scientist David A. Kring and colleagues.
		From then on, the impact cratering record reflects that most objects hitting inner solar system surfaces have been near-Earth asteroids, smaller asteroids from the main belt that are nudged into terrestrial-crossing orbits by a size-selective phenomenon called the Yarkovsky Effect.
		But it should be possible to more accurately date inner solar system surfaces once researchers determine the cratering rate from the near-Earth asteroid bombardment, he added.
	www.innovations-report.de /html/berichte/physik_astronomie/bericht-49425.html (1057 words)

	Interactive Solar System
		The inner planets (Mercury, Venus, Earth, and Mars), are relatively small and made primarily of rock and iron.
		The average distance of the earth to the sun is used as a standard for measuring distances in the solar system and is called an astronomical unit (AU).
		The boundary between the solar system and interstellar space is called the heliopause, and is about 100 AU from the sun.
	liftoff.msfc.nasa.gov /academy/space/solarsystem/solarsystemjava.html (370 words)

	An Overview of the Solar System
		The solar system consists of the Sun; the nine planets, more than 130 satellites of the planets, a large number of small bodies (the comets and asteroids), and the interplanetary medium.
		The first thing to notice is that the solar system is mostly empty space.
		One way to help visualize the relative sizes in the solar system is to imagine a model in which everything is reduced in size by a factor of a billion.
	www.nineplanets.org /overview.html (1331 words)

	Science News Online - Past Issues - Feature Article - 7/27/96
		As fragile as snowballs, comets appear to be easily destroyed in the inner solar system--fragmenting, vaporizing, or suffering fatal collisions.
		In this way, some comets from the Kuiper belt make their way toward the inner solar system, where they come alive in the sun's warmth, gracing the skies of the inner planets with their tails and shrouds of highly reflective dust.
		Known as the Tisserand parameter, that quantity depends on three orbital elements: the inclination of a comet's orbit to the plane of the solar system, the shape of its orbit, and the planet's average distance from the sun.
	www.sciencenews.org /pages/sn_arch/7_27_96/bob1.htm (1730 words)

	Revolution and Rotation of the Planets
		The sizes and shapes of the orbits are realistic, as is the relative positions of the planets for the date in the Fall, 1996, when the plot was constructed.
		Here are the present positions (to scale) of planets in the inner solar system.
		Here is a side perspective of the inner Solar System showing the tilt of the planetary orbits with respect to the plane of the ecliptic.
	csep10.phys.utk.edu /astr161/lect/solarsys/revolution.html (590 words)

	CRSQ Notes - Extraterrestrial Bombardment of the Inner Solar System
		Wayne Spencer has postulated that the solar system was visited by a swarm of celestial objects during the Flood (Faulkner and Spencer, 2000).
		I contend that the majority of extraterrestrial material which impacted the inner solar system during the Flood was probably derived from the Asteroid Belt.
		I believe that the Asteroid Belt likely provided the “celestial objects” which impacted all the terrestrial planets (and satellites) within the solar system during the global Flood of Genesis (which can be viewed as occurring on the scale of at least the inner solar system).
	www.creationresearch.org /crsq/notes/38/38_4/Note0203.htm (2485 words)

	[No title]
		Composition of the Inner Solar System ----------------------------------------- * The Inner Planets are composed primarily of heavy elements, because their surface gravity was not strong enough to hold onto volatile gases which were "cooked out" of the inner solar system over time by the Sun's radiation.
		The Surfaces of the Inner Planets --------------------------------------- * Early in the history of the solar system, impacts with meteors were much more common than they are today.
		This is because there was more "junk" flying around in the solar system, and over time, the planets have swept much of it up.
	www.stthomas.edu /physics/Academics/104/notes/l14.txt (1008 words)

	Scale model of the solar system
		Venus is our nearest neighbour in the solar system, and is clearly visible in the night's sky just after dawn or in the early evening.
		There's nothing else quite like it in the solar system, we really ought to be taking care of it.
		The outer planets, called the gas giants are (with the exception of Pluto) much bigger than the planets of the inner solar system.
	www.solarsystem.org.uk /model2.html (472 words)

	RASNZ Occultation Section - Minor Planet News (January 2004 to December 2005)
		Because the efficiency of the solar panels were slightly degraded as a result of a solar flare in late 2003, the ion engines no longer receive quite as much electricity as they should so the spacecraft's arrival at the asteroid was delayed from mid-summer until September of 2005.
		Sedna appears to be the slowest rotating object in the solar system after Mercury and Venus, whose slow rotation rates are due to the tidal influence of the sun.
		Theoreticians have used it to explain such phenomena as the rate of asteroid transport from the main belt to the inner solar system, the ages of meteorite samples, and the characteristics of so-called "asteroid families" that are formed when a larger asteroid is disrupted by collision.
	occsec.wellington.net.nz /planet/news/plannews.htm (13809 words)

	Eyes on the Sky, Feet on the Ground: Chapter Five
		Solar radiation comes in many forms, most of which are undetectable;e to the human body.
		Sometimes, this seemed organized system of planetesimals can get chaotic, perhaps by the orbit of a large comet which disturbs the order, and asteroids will be knocked out of the belt or collide with each other sending fragments out of the belt.
		These fragments are then collected onto the surfaces of passing comets or roam about the inner Solar System occasionally coming close enough to Earth to collide with it, burning up in the atmosphere completely or leaving pieces large enough to hit the surface.
	hea-www.harvard.edu /ECT/the_book/Chap5/Chapter5.html (8520 words)

	Inner Solar System Model
		The model inner solar system that you see running above is intended to give you a feel for the relationships of the orbits of these planets (and the Earth's Moon).
		It also allows you to change your viewpoint on the solar system in order that you may see what a planetary system (or a planet and its moons) looks like from other viewpoints.
		An angle of 90° shows the system looking down from the top; an angle of 0° shows the system edge on with the orbits reduced to a line through the center of the Sun.
	www.hanksville.org /courseware/solarsystem/planets.html (616 words)

	Characteristics and Origins of the Solar System
		In the inner solar system, where the terrestrial planets presently are, there was the collisional accretion of the planetesimals into a single planet, and that was that.
		In the outer solar system there was much more material in the form of the planetesimals, so the protoplanets grew to much larger masses.
		The existence of craters on solar system objects.
	phobos.physics.uiowa.edu /~srs/Locus32_01.htm (733 words)

	Asteroid Riddling :: Astrobiology Magazine :: Search for Life in the Universe
		Summary (Sep 18, 2005): University of Arizona and Japanese scientists are convinced that evidence at last settles decades-long arguments about what objects bombarded the early inner solar system in a cataclysm 3.9 billion years ago.
		University of Arizona and Japanese scientists are convinced that evidence at last settles decades-long arguments about what objects bombarded the early inner solar system in a cataclysm 3.9 billion years ago.
		This slab was originally located beneath the earth's surface 2.02 billion years ago when a 20 km diameter asteroid or comet crashed into the earth.
	www.astrobio.net /news/modules.php?op=modload&name=News&file=article&sid=1715&mode=thread&order=0&thold=0 (1172 words)

	Asteroids Caused the Early Inner Solar System Cataclysm (Site not responding. Last check: 2007-10-29)
		This is an image of the lunar highlands from the Consolidated Lunar Atlas, which was produced during the Apollo Era by the UA Lunar and Planetary Laboratory.
		The new study by Strom, Malhotra, Kring and their Japanese colleagues indicates this terrain was bombarded mostly by asteroids - not comets - that were flung into the inner solar system when the asteroid belt was destabilized by migrating giant planets.
		This historical image of the heavily cratered lunar terrain was taken on 1 April 1966.
	uanews.org /cgi-bin/WebObjects/UANews.woa/4/wa/SRStoryDetails?ArticleID=11692 (1166 words)

	Exploring the Solar System -- Inner Solar System (Site not responding. Last check: 2007-10-29)
		The inner planets -- Mercury, Venus, Earth and Mars -- are the rocky, metallic, major planets which formed near the Sun.
		With Earth in the midst of the inner planets, they have been explored more thoroughly than the outer planets.
		The Asteroid Belt is in an orbit farther from the Sun than Mars, but not as far as Jupiter, which is the first of the outer planets.
	www.spacetoday.org /SolSys/ExploringSolarSystem/Inner.html (129 words)

	Solar System Live Help: Inner and Outer System (Site not responding. Last check: 2007-10-29)
		If you draw the outer system to scale, the inner system is reduced to a bunch of tiny, almost overlapping ellipses crowded near the Sun.
		When you display the entire system, the inner planets will be all mashed together (except if you select Equal mode for orbit plotting), but even though the discs may overlap you'll usually be able to see the relative longitudes around the sun.
		When you're interested in the details of the inner system (for instance, whether an opposition of Mars occurs at perihelion or aphelion), simply check "Inner" to display only the inner solar system.
	www.fourmilab.ch /solar/help/in-out.html (312 words)

	StarDate Online \| Solar System Guide \| Inner Planets
		Their higher density and smaller size sets them apart from the gas-giant planets, which formed in the outer solar system.
		Because the mass and distance from the Sun is different for each planet, their atmospheres have evolved quite differently during the solar system's 4.5-billion-year history.
		The Moon and Mercury have only thin wisps of atmosphere, which are created by interactions between their surface layers and meteoroids or atoms from the Sun.
	stardate.org /resources/ssguide/inner_planets.html (857 words)

	Archeoastronomy
		And from time to time, these comets and supercomets are disturbed from their normal orbits and come traveling into the inner solar system, where the Earth resides.
		Drawing with it the entire solar system, including of course all the comets of the Oort Cloud and the Kuiper Belt, the Sun is locked in a vast orbit around the galactic nucleus of the Milky Way, completing each revolution in a period of approximately 250 million years.
		Traditional explanations include warfare, famine, and more recently “system collapse,” but the apparent absence of direct archeological or written evidence for causes, as opposed to the effects, has led many archeologists and historians into a resigned assumption that no definite explanation can be found.
	www.barnesreview.org /July_2004/Archeoastronomy/archeoastronomy.html (3376 words)

	A Solar System Scale Model Meta Page
		Shows the real current layout of the inner and outer system, or both (using a bigger image).
		Boston Museum of Science's Community Solar System, Bicycle of the Solar System activity, and Size and Scale.
		There are several scale model of solar system pages out there, but at the moment (1997.Mar.04), they do not seem to be well interconnected.
	www.vendian.org /mncharity/dir3/solarsystem (1378 words)

	APOD: 2002 February 14 - Solar System Portrait (Site not responding. Last check: 2007-10-29)
		Voyager's wide angle camera frames sweep through the inner Solar System (far left) linking up with gas giant Neptune, at the time the Solar System's outermost planet (scroll right).
		Positions for Venus, Earth, Jupiter, Saturn, Uranus, and Neptune are indicated by the corresponding letters while the Sun is the bright spot near the center of the circle of frames.
		Mercury, too close to the Sun to be detected, and Mars, unfortunately hidden by sunlight scattered in the camera's optical system.
	antwrp.gsfc.nasa.gov /apod/ap020214.html (171 words)

	Universe Today - Leftover Material Caused the Late Heavy Bombardment
		Summary - (Sep 16, 2005) Planets in the inner Solar System suffered two devastating periods of asteroid bombardment.
		Scientists are fairly certain that the early period came from asteroids identical to the space rocks in the current main belt between Mars and Jupiter.
		Scientists now think that there was a period at the end of planetary formation when the giant planets swept up leftover material and hurled much outwards, but also some towards the inner Solar System.
	www.universetoday.com /am/publish/naoj_arizona_asteroids.html?1692005 (1210 words)

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