Explain why it only appears that we are at the center of expansion of the universe and why an observer in another galaxywould see the same relative motion of all but the closest galaxies away from her

Q: (b) Draw the shape of the Milky Way for a spaceship with a velocity of 20%, 50%, and 90% of the…

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Q: What is the difference between hot dark matter and cold dark matter? What difference does that make…

A: Dark matter is a mysterious substance that makes up almost 85% of the universe's total mass.   It…

Q: What was the maximum age of the universe predicted by Hubble's first estimate of the Hubble…

A: Hubble’s time: It is defined as follows, Here H is the Hubble’s constant which has unit km/s/Mpc…

Q: Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. At this same…

A: Given that for a universe Rate of expanding H = 90 km s-1 Mpc-1 And at this time the density ρ =…

Q: Calculate the critical density of our universe.

A: Our universe is expanding and critical density is defined as the average density of matter that is…

Q: Explain how the temperature of hot gas can be used to find out about the gravitational pull of a…

A: Given: The hot gas temperature which is used to find the gravitational pull To find: The explanation…

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: b) The cosmic microwave background dates to a time when the universe was -380,000 years old, or to a…

A: Given: 380000 years ago Tr=3000 Kz=1100

Q: Estimate the critical density of the universe if the Hubble's constant was 100 km/s/Mpc.

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Q: If a galaxy is 10.0 Mpc away from Earth and recedes at 520 km/s, what is Hubble's constant?

A: Edwin Hubble in his observations found that the galaxies were moving away from us instead of getting…

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: Discuss the possibility that star velocities at the edges of galaxies being greater than expected is…

A: As per the information given by Erik Verlinde, there difference in the type of matter in different…

Q: Compute a numerical value (in units of protons/m3 ) for the critical density of our Universe. How…

A: The critical density for the Universe is given by, ρ = 3H28πG where H is the Hubble constant and G…

Q: Use the Friedmann equations to show that the deceleration parameter go and the density parameter N…

A: According to Dark energy and the cosmological constant, the acceleration of the scale factor is…

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: Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature…

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Q: How many of you have been caught in a massive traffic jam on the NJ Turnpike or interstate only to…

A: please see the next step for solution

Q: How do we know galaxies are moving away from us?

A: Electromagnetic radiations are affected by the Doppler shift. When the source is in relative motion…

Q: What would be the critical density of matter in the universe if the value of the Hubble constant…

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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: What is meant by the critical density of the universe? Why is this quantity important to…

A: The critical density is the average density of matter necessary for the Universe's expansion to come…

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…