a space smile - Physique chimie Dijon
... Universe and exert such a powerful gravitational pull that they warp the spacetime around them and act as cosmic lenses which can magnify, distort and bend the light behind them. This phenomenon, crucial to many of Hubble's discoveries, can be explained by Einstein's theory of general relativity. "I ...
... Universe and exert such a powerful gravitational pull that they warp the spacetime around them and act as cosmic lenses which can magnify, distort and bend the light behind them. This phenomenon, crucial to many of Hubble's discoveries, can be explained by Einstein's theory of general relativity. "I ...
Sample Exam 3
... C) The redshifts of nearby objects are not caused by the expansion of the universe. D) Stars don’t move, so we can’t measure a velocity for them. E) It can be used to find the distances of nearby stars. 22) Observations today suggest that spacetime in our universe is closest to being A) curved with ...
... C) The redshifts of nearby objects are not caused by the expansion of the universe. D) Stars don’t move, so we can’t measure a velocity for them. E) It can be used to find the distances of nearby stars. 22) Observations today suggest that spacetime in our universe is closest to being A) curved with ...
What is the cosmic microwave background radiation
... these last 14 billion years like the heat from a sun-warmed rock, reradiated at night. Since the early twentieth century, two concepts have transformed the way astronomers think about observing the universe. The first is that it is fantastically large; the portion of the universe visible today is a ...
... these last 14 billion years like the heat from a sun-warmed rock, reradiated at night. Since the early twentieth century, two concepts have transformed the way astronomers think about observing the universe. The first is that it is fantastically large; the portion of the universe visible today is a ...
thumbnail images - Kapteyn Astronomical Institute
... 1. When did the first objects form? 2. What are the progenitors of present-day giant ellipticals? 3. What types of galaxies are there at z> 1, 2, 4? 4. How many massive galaxies were already assembled at z=1,2,4? 5. How does the star formation and galaxy stellar mass density evolve? 6. What is the e ...
... 1. When did the first objects form? 2. What are the progenitors of present-day giant ellipticals? 3. What types of galaxies are there at z> 1, 2, 4? 4. How many massive galaxies were already assembled at z=1,2,4? 5. How does the star formation and galaxy stellar mass density evolve? 6. What is the e ...
APSU_1000_35 Liberal Arts Univ. Life
... which is emitting light is moving towards you or away from you. – An object moving “side to side” or perpendicular, relative to your line of sight, will not experience a Doppler Effect. ...
... which is emitting light is moving towards you or away from you. – An object moving “side to side” or perpendicular, relative to your line of sight, will not experience a Doppler Effect. ...
1.1 Safety in the Science Classroom
... analyze to discover the direction and amount the light has shifted. » A red shift means the wavelength is getting longer, and the star is moving away from us. » Blue shift is the opposite; the star is getting closer. ...
... analyze to discover the direction and amount the light has shifted. » A red shift means the wavelength is getting longer, and the star is moving away from us. » Blue shift is the opposite; the star is getting closer. ...
ONLINE practice exam
... 3. An alien spacecraft flies to the earth from a solar system at 99% the speed of light. As measured by earth observers, the one way trip takes 100 years. (a) How long does the trip take as measured by the aliens aboard the spacecraft? (b) What is the distance from the earth to the solar system (in ...
... 3. An alien spacecraft flies to the earth from a solar system at 99% the speed of light. As measured by earth observers, the one way trip takes 100 years. (a) How long does the trip take as measured by the aliens aboard the spacecraft? (b) What is the distance from the earth to the solar system (in ...
The Merger of Two Disk Galaxies
... the material becomes part of the young Sun, but some debris forms a disk. Within this disk form the planets, moons, comets, asteroids, and meteoroids. Note that this process is repeated on a smaller scale in the ...
... the material becomes part of the young Sun, but some debris forms a disk. Within this disk form the planets, moons, comets, asteroids, and meteoroids. Note that this process is repeated on a smaller scale in the ...
DOPPLER EFFECT
... (a measure of the siren's frequency) was high; and then suddenly after the ambulance passed by, the pitch of the siren sound was low. That was the Doppler effect - an apparent shift in frequency for a sound wave produced by a moving source. ...
... (a measure of the siren's frequency) was high; and then suddenly after the ambulance passed by, the pitch of the siren sound was low. That was the Doppler effect - an apparent shift in frequency for a sound wave produced by a moving source. ...
poster
... the templates defined by Kinney and al. • A Principal Component Analysis (PCA). This method decreases the number of variables and makes possible a spectral classification of the galaxies. Host Galaxy ...
... the templates defined by Kinney and al. • A Principal Component Analysis (PCA). This method decreases the number of variables and makes possible a spectral classification of the galaxies. Host Galaxy ...
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).