Consider a universe in which the Hubble constant has been measured to have the value H0 = 50 km/s/Mpc. Estimate the age of this universe, assuming the recession velocities between pairs of galaxies do not vary with time, and express your answer in units of Gyr.
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Consider a universe in which the Hubble constant has been measured to have the value H0 = 50 km/s/Mpc. Estimate the age of this universe, assuming the recession velocities between pairs of galaxies do not vary with time, and express your answer in units of Gyr.
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- For a circular velocity profile of the type (r) = ar¹ ar1/9, where a is a constant and r is the radial distance from the centre of a spiral galaxy, find the ratio (r)/(r), where (r) is the epicyclic frequency and 2(r) is the angular velocity. Enter your answer to 2 decimal places.You find a small satellite galaxy orbiting 66 kpc from the center of a larger galaxy at a speed of 210 km/s. What is the total mass of the galaxy-satellite galaxy system? (Give your answer in terms of MSun.)In the reading, you were told that there were roughly 10,000 galaxies in the image of the Hubble Ultra Deep Field alone. The image is roughly 10 square arcminutes and there are roughly 1.5*10^8 square arcminutes composing the entire sky. With that in mind and assuming that the Hubble Ultra Deep Field represents an average part of the sky, roughly how many galaxies may exist in the observable universe? (Please include commas for every factor of 1,000; for example 2,343,567,890)
- Compute the critical density of the universe using the universal gravitational constant G= 6.67*10-11Nm2/kg2 and the Hubble constant of 73km/s/Mpc. B) What is the geometrical implication be if the universe has the critical density? Note: 1pc = 3.1*1016mSubject: physicsWhat is the estimated age of the Universe (in years) if the Hubble constant is 60 km/s/Mpc?