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Topic: Observable universe

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Universe

Accelerating universe

Big Bang

Cosmic microwave background

Redshift

Timeline of the Big Bang

Cosmic microwave background radiation

Observation

Diameter

15th century

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	Observable universe - Wikipedia, the free encyclopedia
		The observable Universe is a scientific term used in cosmology to describe a spherical region of the Universe surrounding the Earth.
		The present distance (comoving distance) to the edge of the observable universe is larger, since the universe has been expanding; it is estimated to be about 78 billion light years.
		In a certain sense, we live in the centre of the universe that we observe, somewhat in contradiction to the Copernican principle, which says that the Universe is more or less uniform and it has no distinguished centre.
	en.wikipedia.org /wiki/Observable_universe (527 words)

	Universe - Wikipedia, the free encyclopedia
		The universe is the entire spacetime continuum in which we exist, together with all the energy and matter within it.
		The terms known universe, observable universe, or visible universe are often used to describe the part of the universe that we can see or otherwise observe.
		However, the observable universe, consisting of all locations that could have affected us since the Big Bang given the finite speed of light, is certainly finite.
	en.wikipedia.org /wiki/Universe (1331 words)

	Universe (Site not responding. Last check: 2007-10-08)
		In the first half of the 20th century, the word Universe was used to mean the whole spacetime continuum in which we exist, together with all the energy and matter within it.
		It is not known whether the Universe is finite or infinite in spatial extent and volume, although the majority of theorists currently favor an finite Universe.
		We live in the centre of the observable universe, in apparent contradiction to the Copernican principle which says that the Universe is more or less uniform and it has no distinguished centre.
	usapedia.com /u/universe.html (1061 words)

	UniverseMatrix
		Universe Matrix is a groundbreaking model that pioneers a new synthesis within theoretical physics that is momentous for future developments, particularly within quantum mechanics, relativity, and gravity.
		The Universe Matrix model concentrates on the Universe, of which we are aware, from all physical observations, including the use of macroscopic and microscopic instruments, and is referenced as the Observable Universe.
		If the Universe is expanding at approximately the speed of light, the Universe is 28 billion light years old because the age is determined, by the time light waves reach us from the edge of the Universe plus the edge of the Universe expanding away from us at approximately the speed of light.
	www.universematrix.com (2829 words)

	Chapter 15 Review Questions (Site not responding. Last check: 2007-10-08)
		The observable universe is that portion of the entire universe that is close enough to us that we can receive light from it since the beginning of the universe.
		If the density of the universe is large, then the mass of the universe is large and the rate of expansion has been slowed a great deal by the gravity of the universe.
		If, on the other hand, the density of the universe is small, the mass of the universe is small, and the gravity may not have slowed the expansion much at all.
	www.goshen.edu /nasc/NaSc200/ReviewQuestions/ch15review.html (727 words)

	[No title]
		As the light passes through the universe, observers in subsequent galaxies would see the light as being shifted increasingly toward the red end of the visible light spectrum, until all of the energy is lost.
		Assuming that our observable universe is, in fact, the surface of a hypersphere, this surface on (in?) which we exist may be twice the size of the observable universe.
		The shape of the observable universe is the apparent three dimensional surface of a four dimensional sphere, the hypersphere.
	users.rcn.com /graham.glover/thinkertinker/universe.txt (3069 words)

	Physical Cosmology, Part I (1/31/2000)
		The observable universe only includes light from places that light is reaching us from, i.e.
		We're not in the center of the galaxy or the universe.
		From the farthest point of the observable universe, info is 15 billion years old.
	www-ssg.sr.unh.edu /preceptorial/Summaries_2000/summary2b_2000.html (613 words)

	sciforums.com - Comparisons
		Anyway, it would seem that an electron is the the observable universe as the observable universe is to the actual universe.
		Afer all, the electron is absurdly small and the observable universe absurdly large, at least on human scales.
		I think your comparison isn't quite right, you said that the universe is suspected to be 40 times larger than what is observable, but that the universe is 10^40 larger than an electron.
	www.sciforums.com /showthread.php?t=27603 (442 words)

	The Observable Universe
		The observable universe is the space around us bounded by the event horizon - the distance to which light can have traveled since the universe originated.
		Note that according to inflationary cosmology, the entire universe is much bigger than the observable one (see Figure 02-01b, not to scale), and the confine of observable universe depends on the location.
		The relics and observables are physical facts, while the interpretations of the events are mostly theories or conjestures.
	universe-review.ca /F02-cosmicbg.htm (4414 words)

	Curious About Astronomy: Can I calculate the size of the Universe by converting light years to kilometres?
		If the Universe is 15 billion years old, then light has had 15 billion years to propagate, and so the statements "15 billion years old" and "fifteen billion light years apart" are completely equivalent.
		In essence, your son has calculated an accurate "radius" for the observable Universe provided that the Universe is flat (a sort of 4-dimensional sheet in spacetime in which light travels in straight lines), and that the rate of expansion of the Universe has remained constant.
		This means that either the Universe is sufficiently curved that space doubles back on itself (like on the surface of a sphere), or that the actual Universe is much larger than the observable one.
	curious.astro.cornell.edu /question.php?number=151 (876 words)

	Untitled Document
		Cosmology itself is concerned with the observable universe, models of the universe, and the universe's development and fate.
		Therefore, the resolution to Olber's Paradox is that the observable universe is indeed limited and finite.
		Today, scientists have begun mapping the observable universe, using measurements of the Hydrogen Spike, or the red shift of hydrogen, which can indicate the relative speed of a galaxy, and leads to the determination of its position in the universe.
	www-ssg.sr.unh.edu /preceptorial/supersum/part1.html (5564 words)

	Ned Wright's Cosmology Tutorial - Part 1
		Until a few hundred years ago, the Solar System and the Universe were equivalent in the minds of scientists, so the discovery that the Earth is not the center of the Solar System was an important step in the development of cosmology.
		Since this should be close to the age of the Universe, and we know (and it was known in 1929) that the age of the Earth is larger than 2 billion years, Hubble's value for H
		The abundance of deuterium is inversely related to the density of nucleons in the Universe, and the observed value of the deuterium abundance suggests that there is one nucleon for every 4 cubic meters of space in the the Universe.
	www.astro.ucla.edu /~wright/cosmo_01.htm (1560 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		In the Atom Totality, the observable universe is merely the last 6 electrons, their masses and their spaces.
		But in a Atom Totality theory, the 20 billion year old universe is merely the age of the 2nd orbital and the 7 billion year old universe is merely the age of the 3rd orbital.
		Because the whole universe is a One Atom 231PU Totality may not allow for the manufacture of another 231Pu in the whole entirety of the universe.
	www.iw.net /~a_plutonium/File002k.html (2752 words)

	WMAP Media Resources- Publications
		The patterns imply a universe dominated by a mysterious "dark energy" and an exotic "dark matter." This full sky image of microwave light was captured by the Wilkinson Microwave Anisotropy Probe (WMAP).
		Similarly, we can see through the universe out to where it was filled with free electrons and see the “dense fog” that filled the early universe.
		The reason we can “see” the early universe is that we see objects as they were in the past due to the time it takes light to travel across space.
	wmap.gsfc.nasa.gov /globe.html (754 words)

	Curious About Astronomy: Why is the Universe flat and not spherical?
		Technically, "universe" constitutes everything that exists, while "observable universe" constitutes everything that exists within our horizon (that is, the volume of the universe within which light has had time to reach us).
		Every observation we can ever make is confined to the observable universe, and we have no way of knowing for sure what's happening beyond the horizon.
		However, according to inflationary theory, even if the universe has some curvature, the observable universe should be flat at the level at which we're capable of measuring it.
	curious.astro.cornell.edu /question.php?number=171 (714 words)

	Hubble’s Law Exercise
		Astronomers have known since the 1920s that the universe is expanding.
		The observable universe is the universe we can see.
		= c), determine the radius of the observable universe.
	www-personal.umich.edu /~kjacobse/fall2001/102/hub.htm (469 words)

	SPACE.com -- The Universe: Still Boggling The Minds of 'Finite Creatures'
		The "observable universe," Sweitzer explained, "is the one astrophysicists generally talk about because it's the one open to empirical measurements.
		According to this theory, all the matter and energy in our present observable universe was compressed into a very small area, before, in a nanosecond, it exploded outward and expanded continually until the present time -- and will perhaps do so forever.
		Some cosmologists say our observable universe is one of many that spring forth continually from a series of bubbles.
	www.space.com /scienceastronomy/astronomy/universe_overview_010605-1.html (1104 words)

	One Universe: matter solution 8 (Site not responding. Last check: 2007-10-08)
		According to the text, there are about 100 billion galaxies in the observable universe.
		That means, including dark matter, the mass of the observable universe from these galaxies is roughly M = (10^11 galaxies) * (0.15) * (10) * (10^11 stars * 2 * 10^30 kg/star) = 3.0 * 10^52 kg.
		The size of the observable universe is roughly 13 billion light-years (ly) in every direction.
	www.nap.edu /html/oneuniverse/matter_solution_8.html (110 words)

	Lecture 29: Cosmology (Site not responding. Last check: 2007-10-08)
		Cosmology is the study of the structure and evolution of the universe.
		The universe is not infinite due to its finite age.
		Since the universe is expanding, galaxies were closer together in the past.
	instruct1.cit.cornell.edu /courses/astro101/lec29.htm (491 words)

	O.A.K.: THE UNIVERSE IS OBSOLETE
		Universe used to mean “All that there is.” That attribution has been co-opted by the term multiverse, although technically there can be many multiverses.
		Bubbles are created from the quantum foam of a “parent universe.” Bubbles may also originate from false vacuums, which decay producing new “bubble” universes at an accelerating rate on an infinite tree of bubbles.
		The normal laws of physics were “unborn” at the birth of this universe, because of the incredible density of energy.
	www.nwbotanicals.org /oak/newphysics/parauniverses.htm (6431 words)

	Universe
		The Universe is what we can see from Earth - sometimes called the observable Universe.
		It is because the Cosmos inflated that the Universe seems flat.
		But as the tiny region which would eventually become the Universe was expanded, this curvature was almost entirely flattened out, in the same way as the curvature of the surface of a soccer ball would be flattened out if you blew it up to the size of the Earth.
	www.historyoftheuniverse.com /universe.html (140 words)

	Re: Implications of a flat universe?
		New evidence from observations of supernovae and the cosmic microwave background indicate that the geometry of the universe is flat.
		This sphere is often referred to as 'the observable universe'.
		Since the universe (if flat) is infinite in spatial extent, there is no center to the entire universe, although every observer is at the center of his or her observable universe.
	www.madsci.org /posts/archives/may2000/958470959.As.r.html (533 words)

	Recipe for the Universe - Just Six Numbers (Site not responding. Last check: 2007-10-08)
		A universe within which omega was too high would have collapsed long ago; had omega been too low, no galaxies would have formed.
		The size of the observable Universe is, roughly, the distance travelled by light since the Big Bang, and so the present visible Universe must be around ten billion light-years across.
		All parts of the universe seem to be evolving in a similar way, as though they shared a common origin.
	www.firstscience.com /site/articles/rees.asp (2049 words)

	Astronomy Today Forum - cosmology - expansion of the universe
		The gravitational pull is greatest on the side of the observable universe nearest the BIG fl hole and weakest in the opposite direction.
		The expansion of the universe with an acceleration increasing with distance is the observable effect of this tidal force.
		Early in the life of the observable universe it was compact and internal gravity ruled the motions of its dispersing parts.
	www.astronomytoday.com /forum/post-40.html (2730 words)

	Measuring the Size of the Universe
		The simple answer is that the observable Universe is about 10 billion light years in radius.
		A second way to get an age for the Universe is to try to figure out the time of the big bang itself.
		Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Nicholas White (Director), within the Exploration of the Universe Division (EUD) at NASA's Goddard Space Flight Center.
	imagine.gsfc.nasa.gov /docs/ask_astro/answers/971124x.html (530 words)

	Our Hierarchical Universe
		Galaxies themselves--some 100 billion of them in the observable universe--form galaxy clusters bound by gravity as they journey through the void.
		When cosmologists focus their telescopes on a galaxy billions of light years away, they are actually looking back in time, when the universe was very young.
		Theories about the origin and fate of the universe are being variously bolstered, refined, or turned on their heads based on these new observations.
	archive.ncsa.uiuc.edu /Cyberia/Cosmos/HierarchUni.html (439 words)

	Science of only the observable universe... - Bad Astronomy and Universe Today Forum
		Seriously, isn't speculating on a property, or reality, of the universe that we can't measure or be effected by [in the sense that: our measurements of our reality cant detect it or our physical laws doesn't require it] or even imagine, borderline religion.
		The laws of our universe may be constant [or not ], but our understanding of these laws isn't, physics is a dynamic process rather then a set of defenitive laws that describes how the universal clock looks inside.
		Anyway, thats how I can agree with your statement that we [not me though, obviously], one day will undertstand the universe and at the same time have a mind that is completly certine that we allways will miss the big picture.
	www.bautforum.com /showthread.php?t=15367 (2217 words)

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