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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.

How We Found the Most Distant Quasar (Yet) Known - Space.com


Feb 9, 2015 ... ... beating the last record holder by a full 100 million years — yet, only now ... False-color image of the field around the quasar ULAS J1120+0641 (the faint red source ... The vast majority of these objects were ordinary sunlike stars in ... small size of quasars also means they appear star-like when viewed ...

Discovery that quasars don't show time dilation mystifies astronomers


Apr 9, 2010 ... (PhysOrg.com) -- The phenomenon of time dilation is a strange yet ... is that events occurring in distant parts of the universe should appear to occur ... ... at the same rate no matter their distance from the Earth, without a hint of time dilation. ... If these quasars were like the previously observed supernovae, an ...

The Odd Couple: Quasars and Black Holes | Institute for Advanced ...


Our own galaxy contains a few tens of billions of stars arranged in a disk; the nearest of ... 3C 273 with a faint optical source that looked like an undistinguished star. ... lines were redshifted—Doppler shifted by the cosmological expansion of the ... such as supermassive stars, dense clusters of ordinary stars or neutron stars, ...

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, ...

Galaxies, Clusters, and Quasars - sci.astro - Astronomy Net


Apr 27, 2003 ... H.01 How many stars, galaxies, clusters, QSO's etc. in the Universe? ... does this mean they are that far away now or were that far away when the light left them? ... for example, for every Sun-like star there are about 200 faint red M dwarfs. ... enough to see nearby, much less at large cosmological distances.

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 ...

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.

Quasar Candidates in the Hubble Deep Field


Oct 22, 1998 ... study a wide range of questions in galaxy evolution and cosmology. ... for unresolved faint quasars and AGN in the crude combine images ... each filter, we were able to obtain well sampled radial profiles of the objects and measure their ... inconsistent with that of ordinary stars, 7 pointlike objects with colors ...

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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  ...

Quasars and cosmology - SAO/NASA Astrophysics Data System


These redshifts were based on shifts of absorption lines in the spectra of the galaxies. ... This star-like object of thirteenth magnitude shows a spectrum containing six ... their radio radiation show an ultra-violet excess relative to ordinary faint stars. ... If the volume of the gas cloud is V (cm3) and the distance of the quasar i...

High Redshift Objects - University of Oregon


By the 1960's, the farthest objects detected were quasars. ... that were called `` quasistellar'' radio sources, because, like stars, they were unresolved in visible images. ... at greater distances, so that must mean they were more common long ago. ... Also, the galaxies had more gas that had not been incorporated into stars...