Chapter 26: Problem 56
As a group, create a four- to six-panel cartoon strip showing a discussion between two individuals describing why the sky is dark at night.
Chapter 26: Problem 56
As a group, create a four- to six-panel cartoon strip showing a discussion between two individuals describing why the sky is dark at night.
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Get started for freeThe host galaxy of the supernova HST04Sas (see the image that opens this chapter) has a redshift \(z=1.390\). The light from this galaxy includes the Lyman-alpha \(\left(\mathrm{L}_{\alpha}\right)\) spectral line of hydrogen, with an unshifted wavelength of \(121.6 \mathrm{~nm}\). Calculate the wavelength at which we detect the Lyman-alpha photons from this galaxy. In what part of the electromagnetic spectrum does this wavelength lie?
Explain why it is important to measure how the expansion rate of the universe has changed over time. How is this rate measured?
What does it mean when astronomers say that we live in an expanding universe? What is actually expanding?
Describe how the expansion of the universe explains Hubble's law.
How can astronomers be certain that the cosmic microwave background fills the entire cosmos, not just the vicinity of the Earth?
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