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Topic: Into the Sun

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	Sun - Wikipedia, the free encyclopedia
		The Sun's radius is measured from its center to the edge of the photosphere.
		The optical surface of the Sun (the photosphere) is known to have a temperature of approximately 6,000 K.
		Among the proposals were that the Sun extracted its energy from friction of its gas masses, or that its energy was derived from gravitational potential energy released as it continuously contracted.
	en.wikipedia.org /wiki/Sun (6378 words)

	The Sun (newspaper) - Wikipedia, the free encyclopedia
		The Sun is a tabloid daily newspaper published in the United Kingdom and the Republic of Ireland with the highest circulation of any daily English-language newspaper in the world, standing at 3,154,881 copies daily in early 2006 [1], (compared to USA Today, the best-selling US newspaper at 2,281,831 [2]).
		The Sun is known in Cockney rhyming slang as The Currant Bun [3].
		The Sun's ultra-patriotism has, however, outgrown the racism some claim it came close to embracing in the 1970s and 1980s — the nadir was its coverage of the Broadwater Farm riot of 1985 — perhaps because Murdoch and his editors have realised that it needs to appeal to ethnic minority readers to sell its paper.
	en.wikipedia.org /wiki/The_Sun (3125 words)

	The Sun
		It is the layer of the sun considered to be the surface of the sun.
		It is the portion of the sun that we see when we view the sun in the visible portion of the spectrum.
		The outermost layer of the sun is the corona.
	wind.cc.whecn.edu /~marquard/astronomy/sun.htm (1342 words)

	The Sun
		Earth's Sun is a medium-sized star which lies on the main sequence with 90% of the known stars.
		The granules are described as convection cells which transport heat from the interior of the Sun to the surface.
		The sun is 7.7 kpc or 25,000 light years from the center of the galaxy and orbits the galaxy in about 200 million years.
	hyperphysics.phy-astr.gsu.edu /hbase/solar/sun.html (375 words)

	The Sun
		For many years it was thought that their magnetism, unlike the Earth's, originates fairly close to the surface, from an interplay between the uneven rotation period of the Sun (which increases by more than 2 days as one moves closer to the poles) and the constant churning of hot gas near the Sun's surface.
		Pictures taken of the Sun in such filtered light show much more detail than pictures taken in plain sunlight, and contain additional information: for instance, the magnetic nature of sunspots was found by observing them in spectral lines sensitive to magnetic fields.
		When the Sun is observed in the light of such lines, a sudden brightening is now and then seen near sunspots, at times expanding tens of thousands of kilometers in a matter of minutes.
	www-spof.gsfc.nasa.gov /Education/wsun.html (1034 words)

	Howstuffworks "How the Sun Works"
		The sun warms our planet every day, provides the light by which we see and is absolutely necessary for life on Earth.
		Officially, the sun is classified as a G2 type star based on its temperature and the wavelengths or spectrum of light that it emits.
		The sun is an "average" star, merely one of billions of stars that orbit the center of our galaxy.
	science.howstuffworks.com /sun.htm (332 words)

	The Sun (Site not responding. Last check: 2007-10-24)
		Solar energy is transformed by plants into chemical energy, the first step in the food chain for all living things.
		Magnetic studies of the sun show that these are also regions of very high magnetic fields, up to 1000 times stronger than the regular magnetic field.
		During a flare high energy particles are ejected into the corona, heating regions to temperatures in excess of 5 million K. A flare may release an amount of energy equivalent to 100 million "hydrogen" (fusion) bombs.
	cassfos02.ucsd.edu /public/tutorial/Sun.html (1278 words)

	The Sun
		he Sun is, at present, about 75% hydrogen and 25% helium by mass (92.1% hydrogen and 7.8% helium by number of atoms); everything else ("metals") amounts to only 0.1%.
		It will then be forced into radical changes which, though commonplace by stellar standards, will result in the total destruction of the Earth (and probably the creation of a planetary nebula).
		The Sun and Stellar Structure; notes by Nick Strobel of the University of Washington
	dept.physics.upenn.edu /nineplanets/sol.html (1080 words)

	The Sun - Introduction
		The photosphere is slightly different from one place on the Sun to another, but in general is has a pressure about a few hundredths of the sea-level pressure on Earth, a density of about a ten-thousandth of the Earth's sea-level atmospheric density, and a temperature in the range 4500-6000 Kelvin.
		The chromosphere merges into the outermost region of the Sun's atmosphere, the corona.
		Because of this high temperature, the bulk of the radiation from the corona is emitted at ultraviolet and X-ray wavelengths.
	imagine.gsfc.nasa.gov /docs/science/know_l1/sun.html (972 words)

	The Sun (Site not responding. Last check: 2007-10-24)
		The average distance from the earth to the Sun is 1.00 AU by definition.
		The sun radiation is approximately fl-body radiation for an object that is at about 5800 K. From Wien's law we can deduce temperature which is about 5800 K. Note: This temperature is the temperature of the Sun's photosphere.
		The outer layer of the Sun's atmosphere is the corona.
	www.goshen.edu /nasc/NaSc200/Notes/Sun/sun.html (2546 words)

	StarDate Online \| Solar System Guide \| Sun (Site not responding. Last check: 2007-10-24)
		The Sun was born about 4.6 billion years ago from the gravitational collapse of a vast cloud of gas and dust.
		The Sun's nuclear "furnace," where fusion reactions initially combine hydrogen atoms to produce helium, yielding energy in the process.
		The Sun's outer atmosphere, which is heated by the magnetic field to millions of degrees.
	stardate.org /resources/ssguide/sun.html (635 words)

	Tour the Solar System and Beyond - The Sun (Site not responding. Last check: 2007-10-24)
		We now know that the Sun is a huge, bright sphere of mostly ionized gas about 5 billion years old and is the closest star to earth at a distance of 145 million km (one Astronomical Unit).
		The Sun's power causes the seasons, the climate, the currents in the ocean, the circulation of the air, and the weather in atmosphere...
		The Sun's "surface," known as the photosphere is just the visible 500 km thick layer from which most of the Sun's radiation and light finally escapes, and is the place where sunspots are found.
	spacekids.hq.nasa.gov /osskids/animate/sun.html (770 words)

	SOHO Operations
		The Sun is 150 million kilometers (93 million miles) away from the Earth (this distance varies slightly throughout the year, because the Earth's orbit is an ellipse and not a perfect circle).
		The Sun is neither a solid nor a gas but is actually plasma.
		All of the energy that we detect as light and heat originates in nuclear reactions deep inside the Sun's high-temperature "core." This core extends about one quarter of the way from the center of Sun to its surface where the temperature is around 15 million Kelvin (K) (or 27 million degrees Fahrenheit (F)).
	sohowww.nascom.nasa.gov /explore/sun101.html (836 words)

	The Sun - Zoom Astronomy
		The composition of the Sun is studied using spectroscopy in which the visible light (the spectrum) of the Sun is studied.
		At the Sun's core, nuclear fusion produces enormous amounts of energy, through the process of converting hydrogen nuclei into helium nuclei (nuclear fusion).
		The outer regions of the Sun (the corona) are studied during solar eclipses.
	www.enchantedlearning.com /subjects/astronomy/sun (775 words)

	The Sun
		The Sun does rotate, but because it is a large gaseous sphere, not all parts rotate at the same speed.
		midnight sun - midnight sun, phenomenon in which the sun remains visible in the sky continuously for 24 hr or...
		Deification and adoration of the sun occurred primarily in agrarian societies.
	www.factmonster.com /ipka/A0875446.html (615 words)

	Peoria Astronomical Society - Learning Topics-The Sun
		The Sun is comprised of mostly hydrogen (70%), helium (28%) and the remaining 2% in heavy elements.
		The Sun is not massive enough to become a supernova, and will slowly become a red giant in the last stages of its life, becoming a white dwarf when all the hydrogen fuel has been converted.
		The Sun is thought to have a weak magnetic field, though it has yet to be discovered among the relatively noisy magnetic fields of the sun-spots and the transient polar fields.
	www.astronomical.org /portal/modules/wfsection/article.php?articleid=120 (910 words)

	(S-6) Seeing the Sun in a New Light
		The best-known early observations of the Sun from space were the ones made in 1973 from the space station Skylab.
		Even earlier, around the turn of the century, series of moderate magnetic storms were observed which tended to recur at 27-day intervals, prevalent not near the peak of the sunspot cycle but, perversely, near its minimum.
		Located on the Earth's orbit but 60° ahead and behind it (at the L4 and L5 Lagrangian points of the Earth-Sun system), the cameras on these spacecraft will be able to observe CMEs heading for Earth and even (because of their different vantage points) obtain some information about their 3-dimensional structure.
	www-spof.gsfc.nasa.gov /stargaze/Sun6new.htm (1529 words)

	X-ray Astronomy: The Sun - Introduction
		However, we have known since the 1940's that the Sun is, in fact, a very strong X-ray emitter.
		The 12 X-ray images of the Sun's atmosphere seen here, obtained between 1991 and 1995 at 90 day increments, provide a dramatic view of how the corona changes during the waning part of the solar cycle.
		The Sun's atmosphere, at millions of degrees, is hot enough to emit X-rays, while the much cooler surface of the Sun is not.
	imagine.gsfc.nasa.gov /docs/science/know_l1/xray_sun.html (605 words)

	The Sun
		Electric currents are closely tied with magnetic fields on the Sun and are a key to understanding what goes on both below and above the visible surface of the Sun.The Imaging Vector Magnetograph measures the circular and linear polarization of the Zeeman components of a neutral iron absorption line in the spectrum of the Sun.
		By extrapolating the magnetic field and current data at the Sun's surface, however, it is possible to calculate the magnetic fields in the corona and relate these to the structure, temperatures, pressures, and other physical properties of the corona observed in the spacecraft images.
		The strength of her research is to use the large amount of spacecraft data obtained in the last 8 years by Yohkoh and the last 5 years by SOHO.
	www.ifa.hawaii.edu /research/sun.htm (908 words)

	The Sun (Site not responding. Last check: 2007-10-24)
		The Sun is necessary to the beauty of both these images, but it would still be shining without the cow or the fog bank.
		The Sun is very dynamic with a complicated magnetic field that interacts with the matter in the Sun to create dark sunspots, enormous prominences, and powerful flares.
		The newly-discovered galaxy Dwingeloo 1 from the Isaac Newton Telescope.
	vathena.arc.nasa.gov /curric/space/sun (362 words)

	The Sun (Site not responding. Last check: 2007-10-24)
		The Sun (also known as Sol and Helios) was created in the center of a spinning protostar.
		The surface of the Sun is called the photosphere and is at a temperature of 5800K.
		As well as heat and light, the Sun also emits a low density stream of charged particles (mainly protons and electrons) known as the 'solar wind' and propogates throughout the Solar System at around 450 km/sec.
	www.evula.org /solarsystem/sun.html (373 words)

	Jet Propulsion Laboratory: Sun
		Our Sun, the 5-billion-year-old star that sustains life here on Earth, powers photosynthesis in green plants and is ultimately the source of all food and fossil fuel.
		The connection and interaction between the Sun and Earth drive the seasons, currents in the oceans, weather and climate.
		Although its interior has been modified by nuclear reactions, the outer layers of the Sun are composed of very nearly the same material as the original solar nebula.
	www.jpl.nasa.gov /solar_system/sun/sun_index.html (240 words)

	The Sun and Stellar Structure
		Because the Sun is gaseous, not all parts of it rotate at the the same rate.
		Moving outward from the core to the surface of the Sun, the temperature and density of the gas decreases.
		This is the rarefied upper atmosphere of the Sun.
	www.astronomynotes.com /starsun/s2.htm (2166 words)

	The Sun -- History
		Large sunspots may be occasionally seen by the unaided eye, with the sun near the horizon and dimmed by thick haze.
		Three observers claimed the discovery--Galileo, who risked blindness by looking at the Sun through a telescope, the priest Christopher Scheiner in Germany, who invented the safe observing method of projecting the Sun's image onto a screen, and Johann Fabricius in Holland.
		Schwabe's original interest was the possibility of an unknown planet close to the Sun, which he believed might be detected as a dark spot when passing in front of the Sun.
	www-istp.gsfc.nasa.gov /Education/whsun.html (788 words)

	NASA/Marshall Solar Physics
		The Sun was much dimmer in its youth and yet the Earth was not frozen.
		The Sun is the source of the solar wind; a flow of gases from the Sun that streams past the Earth at speeds of more than 500 km per second (a million miles per hour).
		The Sun produces its energy by nuclear fusion - four hydrogen nuclei are fused to form single helium nuclei deep within the Sun's core.
	solarscience.msfc.nasa.gov /whysolar.shtml (534 words)

	NASA's Solar System Exploration: Planets: Sun: Overview
		A handle-shaped cloud of plasma erupts from the Sun.
		Our solar system's star, the Sun, has inspired mythological stories in cultures around the world, including those of the ancient Egyptians, the Aztecs of México, Native American tribes of North America and Canada, the Chinese, and many others.
		The Sun is the closest star to Earth, at a mean distance from our planet of 149.60 million kilometers (92.96 million miles).
	solarsystem.nasa.gov /planets/profile.cfm?Object=Sun (195 words)

	BBC - Science & Nature - Space - The Sun
		The Sun is a 1 million km wide ball of burning gas.
		The Sun is by far the brightest object in the sky.
		The Sun's energy output is estimated to be 386 billion, billion megawatts.
	www.bbc.co.uk /science/space/solarsystem/sun/index.shtml (762 words)

	The atmosphere of the Sun - the Corona (Site not responding. Last check: 2007-10-24)
		The atmosphere of the Sun - the Corona
		Because the corona is so thin, you can only see it during a solar eclipse, when the glare of the Sun itself (its photosphere) is blocked by the moon.
		The sun itself has been eclipsed by a small disk, it would otherwise blind the equipment.
	www.astro.uva.nl /demo/sun/corona.htm (233 words)

	StarChild: The Sun
		In the Sun's core, hydrogen is being fused to form helium by a nuclear fusion process.
		It is because of the Sun's gravitational pull that Earth orbits the Sun in the manner that it does.
		The Sun has several layers: the core, the radiation zone, the convection zone, and the photosphere (which is the surface of the Sun).
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level2/sun.html (487 words)

	[No title]
		This is a stereoscopic pair of images taken by a special telescope on the Yohkoh spacecraft that "sees" the Sun in the X-ray portion of the spectrum, not visible light like we see with our eyes.
		Without looking at the Sun, patiently and slowly adjust the binoculars on the tripod until they point directly at the Sun and project an image of the Sun onto the white paper.
		The Sun is a star, and if we are to understand anything about the stars that share the night with the Moon, we must first understand more about our own star, the Sun.
	darkskyinstitute.org /sun.html (957 words)

	Astronomy - Our Sun - Richard Talcott
		Because the nebula was rotating, however, not all of the gas and dust could fall into the proto-Sun being forged at the center.
		The solar corona bursts into view at totality during the December 4, 2002, total solar eclipse.
		Despite being a huge ball of gas, the Sun appears to have a sharp edge because the energy radiates from a thin layer only a couple hundred miles thick, compared with the Sun's overall radius of 432,000 miles (695,000 kilometers).
	www.astronomy.com /asy/default.aspx?c=ss&id=75 (1079 words)

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