Calculate the critical density necessary for a closed universe for two extremes of the Hubble constant: 64 km . s-1 . Mpc-1 and 78 km . s-1 . Mpc-1.
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Calculate the critical density necessary for a closed universe for two extremes of the Hubble constant: 64 km . s-1 . Mpc-1 and 78 km . s-1 . Mpc-1.
The critical density necessary for a closed universe for two extremes of the Hubble constant.
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- The Hubble constant is (approximately) 70 kilometers per second per megaparsec. At approximately how far in the future, will the scale-factor be 1% larger than it is today?With the aid of one or more diagram, explain how observations of the CMB can be used to determine whether or not space is flat, positively curved or negatively curved. Describe two pieces of evidence that have led to the suggestion that the Universe contains Dark Energy.Calculate the age of the universe for the following Hubble's constant, (a) 30 km/s/Mpc
- Suppose you have obtained spectra of several galaxies and have measuerd the observed wavelength of the H-Alpha line (rest wavelength = 656.3 nm) to be Galaxy 1: 658.1 nm. Galaxy 2: 667.1 nm. Galaxy 3: 677.6 nm. Assuming a Hubble Constant of 72.5 km/s/Mpc, calculate the distance to each of these galaxies (answer in Mpc)Calculate the Hubble constant for a universe that is 20 billion years old.What is the CMB? Group of answer choices A dense region of 4.5 million stars. A large star of 4.5 million solar masses. The cosmic microwave background of photons left over and cooled down from when the universe became transparent 300,000 years after the Big Bang. The space curvature of the universe
- Estimate the critical density of the universe if the Hubble's constant was 100 km/s/Mpc.If you observe light emitted from a distance object when the cosmic background temperature was Tz=54K, what is the redshift z of that light? At that redshift, what was the diameter Dz of the universe at that time compared to the diameter of today's universe D0?