printer-friendly sample test questions
... 1st Item Specification: Recognize the red shift effect and know that the most distant objects have the greatest degree of red shift. Depth of Knowledge Level 1 1. The expansion of the universe was first deduced from A. Edwin Hubble showing that more distant galaxies are moving away more rapidly. B. ...
... 1st Item Specification: Recognize the red shift effect and know that the most distant objects have the greatest degree of red shift. Depth of Knowledge Level 1 1. The expansion of the universe was first deduced from A. Edwin Hubble showing that more distant galaxies are moving away more rapidly. B. ...
Key Areas covered
... Hubble’s law – can help us work out the speed and distance of stellar objects, we now know galaxies that are further away from us are speeding up Expanding universe – scientific evidence shows us that the universe is expanding and this expansion is accelerating QUESTION: What does all the evidence a ...
... Hubble’s law – can help us work out the speed and distance of stellar objects, we now know galaxies that are further away from us are speeding up Expanding universe – scientific evidence shows us that the universe is expanding and this expansion is accelerating QUESTION: What does all the evidence a ...
Key Areas covered
... Hubble’s law – can help us work out the speed and distance of stellar objects, we now know galaxies that are further away from us are speeding up Expanding universe – scientific evidence shows us that the universe is expanding and this expansion is accelerating QUESTION: What does all the evidence a ...
... Hubble’s law – can help us work out the speed and distance of stellar objects, we now know galaxies that are further away from us are speeding up Expanding universe – scientific evidence shows us that the universe is expanding and this expansion is accelerating QUESTION: What does all the evidence a ...
Clusters of galaxies
... Identification, deep photometry and spectroscopy of 10 clusters around z ~ 0.5 and 10 around z ~ 0.8 Spectroscopy is FORS2 (R ~ 1200) Science goals are build up of stellar populations with redshift (plus weak lensing). ...
... Identification, deep photometry and spectroscopy of 10 clusters around z ~ 0.5 and 10 around z ~ 0.8 Spectroscopy is FORS2 (R ~ 1200) Science goals are build up of stellar populations with redshift (plus weak lensing). ...
Galaxy Clusters
... Galaxies are the basic visible building blocks of the Universe. They are rarely found in isolation, but rather in sparse groups – sort of galactic urban sprawl. But occasional dense concentrations are found. The galaxies in these “Compact Groups” show dramatic differences in the way they evolve and ...
... Galaxies are the basic visible building blocks of the Universe. They are rarely found in isolation, but rather in sparse groups – sort of galactic urban sprawl. But occasional dense concentrations are found. The galaxies in these “Compact Groups” show dramatic differences in the way they evolve and ...
Today`s Powerpoint
... of Newton's). Published in 1915. It begins with: 1. The Equivalence Principle In an elevator with no windows, there is no way to distinguish effects of gravity from the effects of the elevator being accelerated ...
... of Newton's). Published in 1915. It begins with: 1. The Equivalence Principle In an elevator with no windows, there is no way to distinguish effects of gravity from the effects of the elevator being accelerated ...
Astro-2: History of the Universe
... WAVELENGTH λ0 of some spectral feature is moved to a different wavelength λ • For a receding object, the redshift z is the amount of shift towards longer wavelengths: • Z=(λ-λ0)/λ0 • For z much smaller than 1, the line of sight velocity is v=cz, where c is the speed of light (see Universe Chapter ...
... WAVELENGTH λ0 of some spectral feature is moved to a different wavelength λ • For a receding object, the redshift z is the amount of shift towards longer wavelengths: • Z=(λ-λ0)/λ0 • For z much smaller than 1, the line of sight velocity is v=cz, where c is the speed of light (see Universe Chapter ...
Slide 1
... In 1998 astronomers discovered that very distant type 1a supernovae were further away than expected. Measurement of their red shifts (used to measure their velocities) and the use of Hubble’s Law to obtain their distances shows that these supernovae are fainter than expected. These mesurements indic ...
... In 1998 astronomers discovered that very distant type 1a supernovae were further away than expected. Measurement of their red shifts (used to measure their velocities) and the use of Hubble’s Law to obtain their distances shows that these supernovae are fainter than expected. These mesurements indic ...
0708 - Astronomy
... What does it mean that distance and velocity are proportional? balloon is stretched (multiplicatively) by some factor we need to think of the Universe the same way Can we trace the expansion back to the point where it began? that “point” is now the whole balloon/whole Universe... so no. ...
... What does it mean that distance and velocity are proportional? balloon is stretched (multiplicatively) by some factor we need to think of the Universe the same way Can we trace the expansion back to the point where it began? that “point” is now the whole balloon/whole Universe... so no. ...
color-stellar mass diagram
... redshift, we see cosmic epochs of vigorous star formation portion of the Hubble Deep Field galaxies appear more irregular than present day galaxies we see them through the light emitted in UV by the young stars but in UV also nearby galaxies appear less regular ...
... redshift, we see cosmic epochs of vigorous star formation portion of the Hubble Deep Field galaxies appear more irregular than present day galaxies we see them through the light emitted in UV by the young stars but in UV also nearby galaxies appear less regular ...
Redshift
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, ""redder"" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light.Some redshifts are an example of the Doppler effect, familiar in the change of apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is cosmological redshift, which is due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase in their distance from Earth. Finally, gravitational redshift is a relativistic effect observed in electromagnetic radiation moving out of gravitational fields. Conversely, a decrease in wavelength is called blueshift and is generally seen when a light-emitting object moves toward an observer or when electromagnetic radiation moves into a gravitational field. However, redshift is a more common term and sometimes blueshift is referred to as negative redshift.Knowledge of redshifts and blueshifts has been applied to develop several terrestrial technologies such as Doppler radar and radar guns. Redshifts are also seen in the spectroscopic observations of astronomical objects. Its value is represented by the letter z.A special relativistic redshift formula (and its classical approximation) can be used to calculate the redshift of a nearby object when spacetime is flat. However, in many contexts, such as black holes and Big Bang cosmology, redshifts must be calculated using general relativity. Special relativistic, gravitational, and cosmological redshifts can be understood under the umbrella of frame transformation laws. There exist other physical processes that can lead to a shift in the frequency of electromagnetic radiation, including scattering and optical effects; however, the resulting changes are distinguishable from true redshift and are not generally referred to as such (see section on physical optics and radiative transfer).