Calculate the distance to a galaxy that is moving away at 1000 km.9s-1. Given the Hubble time as 16.9 Billion years.
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Q: A galaxy's distance from us is measured to be 49 Mpc. Using the same value of the Hubble constant,…
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A: Given:Hubble's constant, Ho = 60km/(s Mpc)Asked:Hubble's Time, tH = ?
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Q: What is the redshift z of a galaxy 186 Mpc away from us? Note: Assume a value of the Hubble…
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Q: Let's say that the number density of galaxies in the universe is, on average, 3 × 10–68 galaxies/m3.…
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Q: Calculate the Hubble time for a universe with a Hubble constant of 60 km-s-1-Mpc-1.
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- If the galaxy NGC 6643 is 588 million light-years away, what is the lookback time to the galaxy? What does lookback time meanIn 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)Assume that a typical galaxy contains about 200 billion stars and that there are more than 150 billion galaxies in the known universe. Estimate the total number of stars in the universe.
- Imagine that an observed distant galaxy is measured to have a distance of 20 Mpc by a Type Ia supernovae and the redshift of the galaxy indicates the galaxy appears to be moving away from us at a speed of 2200 km/s. What would the Hubble constant be if measured solely based on this galaxy in units of km/s/Mpc?If a standard passenger aircraft can fly at 0.37 km/s (828 mph), how long (in yr) would it take to reach the Sun? How long (in yr) would it take to reach the galactic center? (Note: 1 pc = 3.1 ✕ 1013 km. The radius of the Sun's orbit around the galactic center is approximately 8,300 pc.)If a standard passenger aircraft can fly at 0.26 km/s (582 mph), how long (in yr) would it take to reach the Sun? yr How long (in yr) would it take to reach the galactic center? (Note: 1 pc = 3.1 ✕ 1013 km. The radius of the Sun's orbit around the galactic center is approximately 8,300 pc.) yr
- Calculate the Hubble constant for a universe which is 10 billion years old.Calculate the Hubble constant for a universe that is 20 billion years old.A new astronomical measurement suggests that the Hubble constant is 51 kilometers per second per Megaparsec. If this measurement is correct, what would the Hubble time be in units of years? Is this a plausible value based on other astronomical evidence? Why or why not?
- Using a value for Hubble's constant of 71 km/s per Mpc, find the distance of a galaxy that is receding at a velocity of 1600 km/s.Figure 2 shows the "rotation curve" of NGC 2742. It plots the “radial velocity (V)" (how fast material is moving either toward or away from us) that is measured for objects at different distances (R = radius") from the center of the galaxy. The center of the galaxy is at 0 kpc (kiloparsecs) with a speed of 9 km/sec away from us. (These velocities have been corrected for the observed tilt of the galaxy and represent true orbital velocities of the stars and gas.) 200 100 U4779 -100 As you can see, one side of the galaxy is moving with a negative velocity (spinning toward us), while the other side has a positive velocity (spinning away from us). Using Newton's gravity equation, we will be able to determine the gravitational mass of the entire galaxy and how the mass varies versus distance from the galaxy's center. -200 -8 8 -4 Radius (kpc) Read the following text carefully and follow the instructions: Select five radii spaced evenly from 0-10 kpc across the galaxy. Your selections should…