0
What else can I help you with?
Based on the observed red shifts in the spectral lines of distant galaxies?
Astronomers conclude that the universe is expanding, because wavelengths are increasing.
What evidence do we have to prove that galaxies rotate?
Doppler red shifts and blue shifts of light from the stars in the galaxies.
If all galaxies begin to show blue shifts what would this indicate about the fact of the universe?
If all galaxies began to show blue shifts, it would indicate that the universe is contracting rather than expanding. This could suggest a reversal in the overall dynamics of the universe, potentially leading to a scenario known as the "Big Crunch," where galaxies move closer together and ultimately collide. Such a shift would challenge current cosmological models that support the expansion of the universe, which is primarily evidenced by red shifts observed in distant galaxies. This fundamental change would have profound implications for our understanding of cosmic evolution and the fate of the universe.
Are Large red shifts within galaxies or between them?
Between them.
How does red shift differ between galaxies close to us and ones which are further away?
Generally, the galaxies that are further away will have the larger red shifts.
What was one form of evidence used to support the Big Bang theory?
The observation that red shifts of distant galaxies gets greater the further away the galaxies are.
How did scientists belived that distant galaxies were rapidly moving away from the earth?
Scientists believed that distant galaxies were rapidly moving away from Earth primarily due to the observation of redshift in their light spectra. This phenomenon, known as the Doppler effect, indicated that as galaxies move away, their light shifts toward longer wavelengths (red). Edwin Hubble's observations in the 1920s showed a correlation between the distance of galaxies and their redshift, leading to the formulation of Hubble's Law, which demonstrated that the universe is expanding. These findings provided strong evidence for the Big Bang theory and transformed our understanding of the cosmos.
What ''shifts'' when you have a Doppler shift in starlight?
What shifts is the frequencies of the light. This can be observed by certain lines in the spectrum, which have very specific positions (frequencies).
How do red shifts were used by cosmologists to determine that the universe is expanding?
A Galaxy's red-shift can be used to determine how fast it is travelling away from you. The opposite is "blue-shift" which is what happens when the Galaxy is travelling towards you.The first astronomers, such as Edwin Hubble, to analyse the light coming from distant galaxies discovered that almost all of them were red-shifted, indicating that they were almost all heading away from us. This was the first indication that the universe was expanding.
Why does the light from distant galaxies shift toward longer wavelengths?
The light from distant galaxies shifts toward longer wavelengths due to the phenomenon known as redshift, which is primarily caused by the expansion of the universe. As galaxies move away from us, the wavelengths of their emitted light are stretched, making them appear redder. This effect is a key piece of evidence for the Big Bang theory and indicates that the universe is continuously expanding. Additionally, gravitational redshift can occur when light escapes strong gravitational fields, contributing to the overall observed redshift of distant galaxies.
What diagram best represents the pattern of spectral lines from the same element when it was observed by Edwin Hubble in the light of one of the distant galaxies?
The best diagram to represent the pattern of spectral lines from the same element observed by Edwin Hubble in the light of distant galaxies is the redshift spectrum. This spectrum shows the spectral lines of elements shifted toward longer wavelengths (redshifted) due to the Doppler effect, indicating that the galaxies are moving away from us. The pattern of these lines remains consistent with the element's known absorption or emission spectrum, but the entire set of lines shifts uniformly to the red, reflecting the expansion of the universe.
How do stellar spectra provide evidence that stars are actually moving?
Stellar spectra provide evidence of star motion through the Doppler effect, which causes shifts in the wavelengths of light emitted by a star. If a star is moving towards us, its spectral lines shift towards the blue end of the spectrum (blueshift), while a star moving away from us exhibits a redshift, where spectral lines shift towards the red end. By analyzing these shifts in the spectral lines, astronomers can determine the velocity and direction of a star's movement relative to Earth. This technique has been crucial for understanding the dynamics of stars within galaxies and the expansion of the universe.
