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Quasars or quasi-stellar radio sources are the most energetic and distant members of a class of objects called active galactic nuclei (AGN). Quasars are extremely luminous and were first identified ...

astronomy flashcards | Quizlet


A plot of the orbital speeds of stars and nebulae in a galaxy versus distance from ... stars that he measured in the Andromeda Nebula appeared to be very faint .... defined by the travel time of light over the lifetime of the universe, has not yet ..... a planet of the same mass as Earth were orbiting the Sun at a distance of 10 AU.

Chapter 15 | SixDay Science


Some of these milky nebulae have spiral shapes to them and others look like ... The distances between galaxies are large and are often measured in megaparsecs. ... Those favoring a large Milky Way with the spiral nebulae inside it were ... little dust and gas left between the stars; (c) this means that they have no new star ...

Frequently Asked Questions in Cosmology - UCLA


May 24, 2013 ... How can the oldest stars in the Universe be older than the Universe? ... Are quasars really at the large distances indicated by their redshifts? What about objects with discordant redshifts, like Stephan's Quintet? ... Thus for an accelerating expansion the supernovae at high redshifts will appear to be fainter  ...

About the Hubble Space Telescope


problem Even before NASA launched Hubble, engineers were hard at work building ... —the Wide Field Planetary Camera 2 (WFPC2)—meant for installation by ...... and quasars, the intensely bright, star-like objects appearing at galactic distances .... he called the cosmological constant Astronomers don't yet know whether.

classification of active galaxies and the prospect of a unified ... - jstor


*One in a series of invited review papers currently appearing in these. Publications. ... process involves the problem of ordinary stars. There are ... Type 1 Seyfert galaxies show a bright star-like nucleus. ... of an emission-line cloud, i.e. , a kind of distance scaled to ..... that quasars were bright radio sources, whereas Seyfert...

Space Quotations: Astronomy & Cosmology Quotes


Now appear before You with a new contrivance of glasses [occhiale], drawn from the ... for example, nine miles appear as though they were only one mile distant. ... of the heavens very much like its center; in size and distance it has the ratio of a ... it is by no means absurd to search there above for the themes of our lives, ...

An overview of active galaxies: View as single page


Figure 1 compares two nearby spiral galaxies of similar distance and type. ... Like many AGN, this one appears as a point source of light, just as stars do. ... Initially only AGN which were detected as radio sources were called quasars as ... Also apparent is a faint elliptical galaxy just above the AGN, a distorted spiral galaxy ...

KICP in the News, 2012 - University of Chicago


"We're in the 'dark matter decade' and by 2020 should be able to determine .... got a uniquely close-up look at the brightest "magnified" galaxy yet discovered. ... Very distant galaxies are not only faint but also appear small on the sky. Astronomers would like to see how star formation progressed deep within...

Unit 10: Dark Matter


Most of the mass in galaxies like our own Milky Way does not reside in the stars and gas that can be directly observed with telescopes. .... The first evidence of dark matter appeared in the 1930s, when astronomer .... Zwicky first observed the Coma Cluster, tests of Einstein's theory were just starting, the first cosmological.

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Test: Astronomy Chapter 24 Quiz Q&As | Quizlet


That quasars were at cosmological distances yet appeared like ordinary faint stars meant: → they must be producing such large quantities of energy than even  ...

Transcript for "Quasars - The Brightest Black Holes"


Oct 3, 2013 ... The object to the right is a star, but the central object just looks like a star; it appears to have the same brightness yet billions of light-years separate them. ... There are billions of 'ordinary' galaxies in the Universe. ... If these galaxies were truly the source of the radio emission, their large distance...

Seyfert galaxies, quasars and redshifts - ADS


In Hubble's time it was accepted that redshift and distance were well correlated .... appeared to have comparable separations of io-i~ kpc if cosmological redshifts ..... Yet these quasars have apparent magnitudes of about i6, just like 3C 232. ..... Among the new objects found were the faint, high galactic latitude blue stars that...