Calculate the Hubble constant for a universe that is 20 billion years old.
Q: Calculate the age of the universe if the Hubble constant were 65 km/s/Mpc.
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Q: Assume a flat FRW universe, dominated by radiation throughout its history. Calculate the physical,…
A: The objective of the question is to calculate the physical, cosmological horizon size at a given…
Q: As the Universe becomes older, what effect will that have on a slope of the Hubble's diagram: It…
A: Doppler effect in light is the change in frequency of light observed by the observer when the source…
Q: Estimate the age of the universe for a Hubble constant of (a)50km/s/Mpc, (b) 75km/s/Mpc, and (c) 100…
A: The Hubble time is t = 1/H0 . For each value of Ho, we have: a). t = 6.18 × 10¹⁷ s = 1.96 × 1010 yrs…
Q: Which factor has slowed down the expansion of the universe?
A: The expansion of the universe has slowed down because the object pull each other towards themselves…
Q: Assuming that hydrogen fusion requires the Universe to have a temperature of T ≥ 107 K (as measured…
A: The cosmic microwave background radiation (CMBR) is electromagnetic radiation, generated in the…
Q: Imagine that an observed distant galaxy is measured to have a distance of 40 Mpc by a Type Ia…
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Q: Consider a universe in which the Hubble constant has been measured to have the value H0 = 50…
A: Hubble's law gives the idea that the universe is continuously expanding, and that galaxies are…
Q: Calculate the age of the universe if the Hubble's constant was 60 km-s¹ Mly¹.
A: Our universe is constantly expanding, It was observed by Edwin Hubble when he saw the galaxies…
Q: What is the evidence that the universe was very uniform during its first 400,000 years?
A: The universe was formed from a big explosion called Big Bang. In the beginning, everything was…
Q: why do you have to know the distance to a galaxy to find its mass?
A: The orbital motion of stars explains the masses of galaxies. The stars in a heavier galaxy exhibit…
Q: If a galaxy has a redshift of 0.35 and the hydrogen line has a wavelength of 486.3 nm, what will be…
A: Redshift happens when the source of light moves away from the observer. The frequency observed will…
Q: Calculate the critical density of a universe with Hubble constant of 89 km-s¹.Mpc¯¹.
A: It is observed that galaxies are moving away from each other and the farther they are faster they…
Q: Suppose that we were to discover that all galaxies are actually twice as far away as we think. How…
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Q: What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…
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Q: The present number density of electrons in the Universe is the same as that of protons, about 0.2…
A: The present number density of electrons = 0.2m-3. Long before the formation of microwave background,…
Q: What does the size difference of the irregularities in the background radiation tell us about the…
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Q: Estimate the critical density of the universe if the Hubble's constant was 100 km/s/Mpc.
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Q: Calculate the Hubble time for a universe with a Hubble constant of sixty kilometers per second per…
A: Given:Hubble's constant, Ho = 60km/(s Mpc)Asked:Hubble's Time, tH = ?
Q: Calculate the temperature of the universe when photons can no longer disassociate deuterons. Use the…
A: Given: The photons can no longer disassociate deuterons.
Q: why are the shells visible around some elliptical galaxies significant?
A: The shell structures in the elliptical galaxies indicates the extremely low surface brightness and…
Q: Why aren’t the fluctuations there in the formation of Galaxies and other similar entities?
A: Galaxies and the other similar entities could not be without the existence of fluctuations in the…
Q: What is the evidence that the universe was very uniform during its first 400,000 years?
A: The evidence of the uniform nature is explained by particle physics. Before the formation of the…
Q: Use the redshift of 3.8 for 4C41.17, a powerful radio galaxy, to determine the distance of the…
A: (a) the speed of the galaxy is, vc=z+12-1z+12+1vc=3.8+12-13.8+12+1=0.917v=0.9173×105 km/s=2.75×105…
Q: Calculate the age of the universe for the following Hubble's constant, 200 1... - N (d) 20 km/s/Mpc
A: As per Hubble's law, the universe is expanding. If we assume that the expansion's apparent velocity…
Q: Estimate the critical density of the universe if the Hubble's constant was 50 km/s/Mpc.
A: The minimum density that is required to stop the expansion of the universe is defined as the…
Q: According to the version of the Big Bang Theory without a Cosmological Constant (and without Dark…
A: Hubble's Law states that as the universe is expanding in all directions, the receding velocity of an…
Q: What was the lowest temperature for photons to be able to produce 0 particles in the early universe?…
A: Given: kT=mc2
Q: Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature…
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Q: If most galaxies are moving away from us, are we at the center of the universe? Why or why not?
A: Introduction: The universe encompasses everything in existence, from the smallest atom to the…
Q: Calculate the age of the universe if the Hubble's constant was 29.45 km-s¹ Mly''.
A: It is observed that the galaxies in our universe are moving away from each other. This expansion of…
Q: How does the Hubble constant relate to the age of the universe?
A: Hubble constant is defined as the proportionality constant between velocity of galaxies far from us…
Q: Galaxy A is measured to have a smaller cosmological redshift than Galaxy B. Which galaxy is farther…
A: Redshift: It is stated as the change in the frequency of the light and is used to study the position…
Q: Calculate the age of the universe for the following Hubble's constant, m (c) 80 km/s/Mpc Of
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Q: (a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…
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Q: Calculate the critical density necessary for a closed universe for two extremes of the Hubble…
A: The critical density necessary for a closed universe for two extremes of the Hubble constant. given,…
Q: What would be the critical density of matter in the universe if the value of the Hubble constant…
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Q: Calculate the Hubble time for a universe with a Hubble constant of 60 km-s-1-Mpc-1.
A: Edwin Hubble observed that the galaxies were moving away from us. He calculated their recession…
Q: What evidence can you cite that the expansion of the universe is accelerating?
A: It is observed that galaxies are moving away from Earth at speeds proportional to their distance.…
Q: By what factor would the critical density of the universe today change if the Hubble constant today…
A: Understanding the critical density of the universe is pivotal in unraveling its composition. The…
Q: The Hubble constant is (approximately) 70 kilometers per second per megaparsec. At approximately…
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