Chapter 34: Q2CQ (page 1236)
If there is no observable edge to the universe, can we determine where its centre of expansion is? Explain.
We can't pinpoint its centre of expansion because each observer believes he is in the centre, which shouldn't be possible if the centre is unique.
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The peak intensity of the CMBR occurs at a wavelength of
Must a complex system be adaptive to be of interest in the field of complexity? Give an example to support your answer.
For experimental evidence, particularly of previously unobserved phenomena, to be taken seriously it must be reproducible or of sufficiently high quality that a single observation is meaningful. Supernovais not reproducible. How do we know observations of it were valid? The fifth force is not broadly accepted. Is this due to lack of reproducibility or poor-quality experiments (or both)? Discuss why forefront experiments are more subject to observational problems than those involving established phenomena.
Our solar system orbits the center of the Milky Way galaxy. Assuming a circular orbit
Distances to local galaxies are determined by measuring the brightness of stars, called Cepheid variables, that can be observed individually and that have absolute brightness at a standard distance that are well known. Explain how the measured brightness would vary with distance as compared with the absolute brightness.
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