what was the temperature of the microwave background radiation when it was emitted? a universe expanding at a faster rate than we see from Earth The spectra of most galaxies tell us that a. most galaxies appear to be moving away from us.

This includes nebula , supernova remnants and galaxies .

Since all but the nearest galaxies appear to be in motion away from us, with the most distant ones moving the fastest, we must be living in an expanding universe. Any spectrum from any object allows us to look for the signatures of elements. Recently, as we have already noted, astronomers have discovered a few galaxies that are so far away that the light we see now left them less than a billion years or so after the beginning (Figure \(\PageIndex{2}\)). b. their light comes predominantly from objects other than stars.

9.5. X-ray spectrum of supernova remnant Cas A from ASCA data.

This means that their spectral lines?

The rotation curves of galaxies tell us that galaxies are mostly. What do astronomers mean when they say that the universe is homogeneous?

The spectra of most galaxies tell us that most galaxies appear to be moving away from us. Ask Question Asked 6 years, 9 months ago.

When we look at galaxies in the universe and measure their star formation rates, we find that galaxies at redshifts z = 1 have higher star formation rates than they do now.

3 $\begingroup$ Spectra from galaxies include both absorption and emission lines.

Study 20 Chapter 15 The Realm of the Galaxies flashcards from Sneha S. on StudyBlue. Galaxy Spectra • Galaxy spectra – Continuum – Absorption Lines – Emission Lines – Typical Spectra • Elliptical • Spiral • Irregular • Galaxy motion – Radial velocity – Redshift – Redshift ! the spectra of most galaxies tell us that: most galaxies appear to be moving away from us the cosmic microwave background radiation was emitted when the universe had a size about 1/1000 of todays value. At that time, the universe was _____ times the size it is today.

C have a higher intensity in the red part of the spectrum. Observations of the most luminous galaxies take us even further back in time. The spectra of most galaxies show redshifts. d. galaxies in the past rotated at a faster rate than they do today. The spectra of most galaxies show redshifts. B have normal wavelengths, but absorption of light makes them appear red. d. Viewed 7k times 8.

Matter at large distances from galaxy's centre moves … Observations of the most luminous galaxies take us even further back in time.

The absorption lines visible in the spectra of different stars are different, and we can classify stars into different groups based on the appearance of their spectral lines. The spectra of most galaxies tell us that a. galaxies appear to be moving away from us. Recently, as we have already noted, astronomers have discovered a few galaxies that are so far away that the light we see now left them less than a billion years or so after the beginning (Figure \(\PageIndex{2}\)).

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