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Measuring a Quasars Redshift
roughly.00001, which is slightly above (or even below) the precision for many common redshifts measurements. But there are indeed good arguments that the energy of the universe should be exactly zero! D) Stars older than universe? The major difficulty in applying this test to any particular object is that, in order to test the observed surface brightness against the expectation, one must first know the absolute brightness in the first place. Energy created from a radiant source. The motivation for inflation was to explain the horizon and flatness hamlet - Act VI, Scene III problems (basically, why is the universe so uniform and close to flat if we know that these are unstable solutions to the equations governing BBT; this is covered in more detail in 3e ). Spectroscope An apparatus to explore spectra.
Multicultural astronomy the variety of ways cultures of the past and present have observed, recorded, interpreted, and made use of astronomy to structure their lives, and in some cases satisfy their curiosity about the universe. Aphelion is the point of orbit of a planet or comet which is farthest away from the sun. Collimation : Perfectly aligning a telescopes optics. Sublimate Transition of solid substance that is evaporated into a gas without reaching the liquid phase. By the mid-1990s, a number of cosmological observations had reached sufficient precision that it was difficult to reconcile them with a universe dominated by dark matter. Multiple star system Gravity bound system in which two or more stars orbit a common center of mass. Proxima Centauri Nearest star to the sun.2 light years away. In addition, this rapid expansion would exponentially drive the curvature of the inflating region to zero, resulting in a density extremely close to the critical value no matter what its initial value. If one knows the values of these densities and the Hubble parameter at a particular time, then one can determine the value of the deceleration parameter; hence, the disappearance of that parameter from much of the cosmological literature in the last several years. Peebles: Principles of Physical Cosmology (Princeton University Press, 1993).
Quasar Highly energetic core in a young galaxy believed to be powered by a big black hole; Short for quasi-stellar object. This misses two crucial points: Existence, not temperature, is the key. Prominence A massive eruption of gas streaming off the surface of the sun towards the corona. It is the most massive known structure in the observable universe topping the list of 220 known superclusters. The violation of the CP symmetry is naturally built into the electroweak theory, and at high temperature the Standard Model of particle physics also allows non-conservation of the baryon number. Fritzsch: The Creation of Matter: The Universe from Beginning to End (Basic Books, 1984). Unfortunately, the life time of stars (which is to say the time during which they are fusing hydrogen in their cores into helium) decreases strongly with their mass. Remarkably, given the vast differences that these cases present for the geometry and size of the universe, determining which of these three cases holds for our universe is actually still an open question in cosmology.