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	Massive compact halo object - Wikipedia, the free encyclopedia
		Massive compact halo objects, or MACHOs, are a type of astronomical body proposed as one possible explanation for the presence of dark matter in galaxy halos.
		A fl hole is detected by the halo of bright gas and dust that forms around as an accretion disc being pulled in by the fl hole's gravity.
		Other forms of MACHO are seen when the MACHO passes in front of or nearly in front of a star and the MACHO's gravity bends the light causing the star to appear smaller and brighter, in an example of gravitational lensing.
	www.encyclopedia-online.info /Massive_compact_halo_object (683 words)

	Massive compact halo object - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-20)
		Massive compact halo objects, or MACHOs, is a general name for any kind astronomical body which might explain the apparent presence of dark matter in galaxy halos.
		However, these objects, red and white dwarfs are not completely dark, they do emit some light, and so can be searched for with the Hubble Telescope and with proper motion surveys.
		Recent work has also suggested that ancient MACHOs are not likely to account for the large amounts of dark matter now known to be present in the universe; the Big Bang as it is currently understood simply couldn't produce enough baryons without causing major problems in the observed elemental abundances particularly the abundance of deuterium.
	encyclopedia.worldsearch.com /massive_compact_halo_object.htm (725 words)

	Event Horizon Volume 3 4 More Machos (Site not responding. Last check: 2007-10-20)
		When a massive object crosses close to the line of sight between us and a more distant star, some of its rays may be deviated in such a way that the brightness of the background star appears to increase.
		The duration of the brightening is affected by the mass of the object, its velocity across the line-of-sight, and the impact parameter - the angular distance of closest approach to the background source.
		Reasonable estimates of the distance of the lens and the average speed of halo objects across the line-of-sight allow the masses of the lenses to be estimated.
	www.amateurastronomy.org /Events/EH345.html (599 words)

	Massive compact halo object (Site not responding. Last check: 2007-10-20)
		Recent work has suggested that MACHOs are not likely to account for the large amounts of dark matter now known to be present in the universe; the Big Bang as it is currently understood simply couldn't produce enough baryons.
		MACHO Project Primary aim is to test the hypothesis that a significant fraction of the dark matter in the halo of the Milky Way is made up of objects like brown dwarfs or planets: these objects have come to be known as MACHOs, for MAssive Compact Halo Objects.
		Halo of Lancelot Guild website for members of the Halo guild on the Lancelot Server.
	www.serebella.com /encyclopedia/article-Massive_compact_halo_object.html (1042 words)

	Massive compact halo object (Site not responding. Last check: 2007-10-20)
		Massive compact halo objects, or MACHOs, are a type of astronomical body proposed as onepossible explanation for the presence of dark matter in galactic halos.
		A fl hole is detected by the halo of bright gas anddust that forms around as an accretion disc being pulled in by thefl hole's gravity.
		Other formsof MACHO are seen when the MACHO passes in front of or nearly in front of a star and the MACHO's gravity bends the light causingthe star to appear smaller and brighter, in an example of gravitational lensing.
	www.therfcc.org /massive-compact-halo-object-33678.html (547 words)

	Dark matter - Wikipedia, the free encyclopedia
		Galaxies show signs of being composed largely of a roughly spherical halo of dark matter with the visible matter concentrated in a disc at the center.
		Low surface brightness dwarf galaxies are important sources of information for studying dark matter, as they have an uncommonly low ratio of visible matter to dark matter, and have few bright stars at the center which impair observations of the rotation curve of outlying stars.
		Possibilities involving normal baryonic matter include brown dwarfs or perhaps small, dense chunks of heavy elements; such objects are known as massive compact halo objects, or "MACHOs".
	www.wikipedia.org /wiki/Dark_matter (2567 words)

	Massive compact halo object (Site not responding. Last check: 2007-10-20)
		Massive compact halo objects or MACHOs are a type of astronomical body as one possible explanation for the presence dark matter in galactic halos.
		A fl hole is by the halo of bright gas and that forms around as an accretion disc being pulled in by the fl gravity.
		Other forms of are seen when the MACHO passes in of or nearly in front of a and the MACHO's gravity bends the light the star to appear smaller and brighter an example of gravitational lensing.
	www.freeglossary.com /Massive_compact_halo_object (840 words)

	Star survey reveals part of the "missing mass" of the galaxy consists of ancient, dying stars
		They calculate that if these dim stellar remnants are spread evenly throughout the galactic halo then they can account for at least 3 percent, and perhaps as much as 35 percent, of the dark matter in the galaxy.
		If their analysis is correct, the galactic halo is filled with a vast population of these dim, dying stars, many of which must be between 10 billion and 13 billion years old, making them relics of the earliest days of the galaxy.
		Normal baryonic matter is assumed to be mostly in the form of massive compact halo objects, or MACHOs.
	www.eurekalert.org /pub_releases/2001-03/VU-Ssrp-2203101.php (1206 words)

	Seventy-Year Quest For Galactic Dark Matter Ends With Discovery Of Population Of Cool White Dwarfs In The Halo Of Our ...
		The rest is predicted to be massive particles that interact weakly with the rest of matter — a veritable zoo of possible creatures, from heavy neutrinos, called neutralinos, to photinos or axions.
		White dwarfs are Earth-sized objects with about half the mass of the Sun, the core of what once was a red giant star that expelled large fractions of its mass into space.
		Theories of galaxy and star formation will have to explain why the halo stars are overwhelmingly white dwarfs while the lower mass stars, which have not had enough time to evolve into white dwarfs, seem to be missing or are in abnormally small numbers.
	www.sciencedaily.com /releases/2001/03/010322233414.htm (1394 words)

	HubbleSite - Release Text about "Hubble Rules Out a Leading Explanation for Dark Matter"
		The Galactic halo is a vast spherical region that envelopes the Milky Way's spiral disk of stars, of which Earth's Sun is one inhabitant.
		When the intervening object is briefly aligned between Earth and a distant star, it amplifies, or gravitationally lenses, the light from the distant star.
		Bahcall cautions, however, that his results do not rule out other halo objects that could be smaller than the red stars such as brown dwarfs —; objects not massive enough to burn hydrogen and shine in visible light.
	www.hubblesite.org /newscenter/newsdesk/archive/releases/1994/41/text (1558 words)

	halo (Site not responding. Last check: 2007-10-20)
		HALO Trust The HALO Trust is a registered British charity and registered American NPO whose purpose is to remove the debris left behind by war, in particular, landmines and unexploded ordinance that might present a danger to local civilians.
		Halo (optical phenomenon) Picture from the NOAA Photo Library Halos are optical phenomena that appear in the sky near or around the Sun or Moon, for example "sun-dogs" or the parahelia, or a paraselene or "mock-moon." There are many other types of halos, but they are all caused by ice crystals
		Massive compact halo object Massive compact halo objects, or MACHOs, are a type of astronomical body proposed as one possible explanation for the presence of dark matter in galactic halos.
	www.searchtermtrends.com /terms/halo.html (1018 words)

	Microlensing
		51, 1937, 290) noted that the bending of light by massive objects should lead to gravitational lensing: the focusing of light from a distant object by a mass that lies in the line-of-sight between the distant object and the observer.
		Light from a star (the yellow dot in the figure) in the LMC is deflected, indeed focused, by a passing halo object (the brown dot).
		The distance between the image (the yellow dot) and the halo object (the brown dot) is d.
	www.physics.fsu.edu /Courses/spring98/AST3033/Micro/lensing.htm (2141 words)

	Object in TutorGig Encyclopedia
		Object SQL mapping commonly misnamed object relational mapping or O RM, is a programming technique that links SQL databases to Object oriented programming object oriented language concepts, creating in effect..
		Linguistic typology topics In linguistic typology, Subject Object Verb SOV is the type of languages in which the subject, object, and verb of a sentence appear usually in that order.
		Linguistic typology topics Object Subject Verb OSV is one of the permutations of expression used in Linguistic typology.
	www.tutorgig.com /es/Object/4 (876 words)

	Stars In Neighboring Galaxy Offer Clues To Mystery Of Dark Matter
		Gravitational lensing is what happens when a massive dark object in space, such as a planet, dim star, or fl hole, crosses in front of a luminous source star in the background.
		Gravitational lensing is one of the few ways astronomers may detect the presence of dark, massive objects in our galaxy.
		If it was in the halo, it would have been moving much slower, such as 35 kilometers per second.
	researchnews.osu.edu /archive/macho.htm (876 words)

	Institute for Astronomy: Postgraduate Projects: 2004
		It is unclear whether this is caused by fundamental structural differences in their central engines, such as the rate or type of accretion, or the spin of the massive central fl hole.
		Additionally, the clustering properties of the average halo within which the galaxies reside may depend on halo properties (and consequently galaxy properties) other than the halo mass.
		It will be possible to draw some conclusions as to the star formation history of the distinct kinematic components of the Galaxy, and to refine their age estimates, for example by removing thick disk and halo contamination from the disk WD luminosity function.
	www.roe.ac.uk /ifa/postgrad/projects/proj_03.html (2861 words)

	Old white dwarf may hold the key to dark matter
		These plates, taken with the UK Schmidt Telescope in Australia, showed that the object was traversing the sky at 1.3 arcseconds per year, which is much faster than the majority of the Sun's neighbours.
		An intervening object can act as a gravitational lens, focusing light and causing a temporary increase in the observed brightness of a background star.
		However as such objects had never actually been seen before there was some doubt as to their nature.
	www.ast.cam.ac.uk /~sth/wd.html (1003 words)

	MACHO Project Press Release - AAS Meeting, San Antonio, TX
		Microlensing is the term given to the apparent brightening of a star caused by the gravitational field of a massive object passing almost directly in front of it.
		Calculating a hypothetical percentage of dark matter in the halo of the Milky Way is a function of both the number of objects detected and the mass of those objects.
		One appears to be microlensing by a binary MACHO and the other event is the microlensing of a giant star by a lensing object which transits the face of the star, the first detection of this effect.
	wwwmacho.mcmaster.ca /Pubs/PressRelease/AAS96.html (1871 words)

	brown dwarf concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-20)
		has definition A self-gravitating, self-luminous gaseous object which is not sufficiently massive to result in thermonuclear hydrogen fusion reactions in its core and cannot therefore be considered a star.
		Such objects are expected to have a mass less than 7% of the Sun's mass and represent a "missing link" between low-mass stars and gas giant planets like Jupiter (at 0.1% of the Sun's mass).
		is a kind of massive compact halo object
	www.site.uottawa.ca:4321 /astronomy/browndwarf.html (258 words)

	HubbleSite - Q & A about "Astronomers Measure Mass of a Single Star — First Since the Sun" (Site not responding. Last check: 2007-10-20)
		Believed to make up a significant chunk of our universe, dark matter may be partly made up of celestial objects that are too faint to see because they are very cool.
		These objects, referred to as "Massive Compact Halo Objects," or MACHOs, may be lurking in the halos of galaxies.
		If a MACHO object passes in front of a star in a nearby galaxy, such as the Large Magellanic Cloud, then the gravitational field of the MACHO will act like a lens, causing the brightness of the background star to increase as the MACHO passes by.
	www.hubblesite.org /newscenter/newsdesk/archive/releases/2004/24/faq (431 words)

	Astrophysicists find Evidence of Dark Matter, the "Missing Matter" of the Universe
		Scientists at the Center for Particle Astrophysics (CPA) have reported the first evidence for the existence of MACHOs -- MAssive Compact Halo Objects -- stars too small to shine that are concentrated in the halo of galaxies.
		This brightening was attributed to a phenomenon known as "microlensing," in which the gravity of a massive invisible object acts like a magnifying lens while it crosses in between a visible star and a telescope on earth.
		The invisible object detected by the CPA scientists and their Australian collaborators is at least as massive as Jupiter.
	www.lbl.gov /Science-Articles/Archive/missing-mass-universe.html (819 words)

	The darkest mystery of them all (Site not responding. Last check: 2007-10-20)
		MACHOs: Scientists say the universe may contain swarms of “massive compact halo objects” — perhaps dim neutron stars or dwarf stars, or brown dwarfs or rogue planets, or even collapsed stars and fl holes left over from the primordial Big Bang.
		For nearly a decade, astronomers have been conducting a survey known as the MACHO Project to watch for the gravitational lensing”; effect created when a massive compact halo object passes in front of a distant light source.
		And a year ago, researchers said our own galaxy was surrounded by a gamma-ray halo that could hint at the existence of previously undetected WIMPs.
	www.msnbc.com /news/189763.asp (1186 words)

	MIT catches MagIC from telescopes \| SpaceRef Canada - Your Daily Source of Canadian Space News
		Major goals in these areas are to extend the kinematic ring models for Uranus and Saturn, to study asymmetry in particle size distributions in "clumpy" rings such as Saturn's F ring and Uranus's lambda ring, and to continue investigating the upper atmospheres of Uranus, Jupiter, Titan and Saturn.
		Fewer than 100 Kuiper Belt objects are known, and much more observational work is needed to understand their dynamical and physical properties.MagIC is ideal for documenting additional Kuiper Belt objects because recovery observations must be accomplished soon after the discoveries or the objects will be lost.
		A massive compact halo object (MACHOs) could act as a gravitational lens by focusing the light from a source, making it seem brighter for a while.
	www.spaceref.ca /news/viewpr.html?pid=4910 (1536 words)

	The darkest mystery of them all - Space News - MSNBC.com
		All the signs point to extra matter that we can’t detect directly, surrounding galaxies like a huge halo, perhaps filling in the space between galaxies and exerting an extra gravitational effect on the motions of whole galaxy clusters.
		All these objects represent more or less ordinary states of matter (although one would be hard-put to call fl holes “ordinary”).
		For nearly a decade, astronomers have been conducting a survey known as the MACHO Project to watch for the “gravitational lensing” effect created when a massive compact halo object passes in front of a distant light source.
	www.msnbc.msn.com /id/3077833 (1227 words)

	The star splitter: Microlensing technique pioneered by NSF researchers finds black holes
		Albert Einstein, in his General Theory of Relativity, first showed that the gravitational field of a star distorts space so that light passing near is deflected, much like an optical lens or magnifying glass deflects light.
		Dubbed the MACHO project, for Massive Compact Halo Objects, the search seeks to learn more about the "dark matter" that dominates the mass of our galaxy, some of which might be in the form of massive compact objects.
		Complex calculations of the location and brightness of the stars and the mass of the objects passing in front led the teams to conclude the objects were probably fl holes drifting through space -- a new find for astronomers.
	www.eurekalert.org /pub_releases/2000-01/NSF-TssM-1201100.php (499 words)

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