Question

A large elliptical galaxy at the center of a cluster of galaxies is located at a...

A large elliptical galaxy at the center of a cluster of galaxies is located at a distance of 400 Mpc from

us.

a. Calculate the velocity (in km/s) at which the galaxy recedes from us if its motion is completely due to the expansion of the universe as expressed by the Hubble Law. (3 points)

b. Calculate how many years the light has traveled from the galaxy to reach us. [Hint: this is the same as the distance measured in light-years. 1 Mpc = 3.26 million lt-yr] (1 point)

Science   Advanced-Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A nearby, rich cluster of galaxies is approximately 90 Mpc from Earth and has a diameter...
A nearby, rich cluster of galaxies is approximately 90 Mpc from Earth and has a diameter of about 6 Mpc. It’s radial velocity dispersion is 977 km/s. a) Estimate how long a galaxy in this cluster would take to travel from one side of the cluster to the other. (Hint: assume that the galaxy moves with a constant speed equal to the cluster radial velocity dispersion) b) How does the answer from (a) compare with the Hubble time, tH? c)...
9. The Hubble Law and Standard Candles. An elliptical galaxy called A lies at a distance...
9. The Hubble Law and Standard Candles. An elliptical galaxy called A lies at a distance of 20 Mpc (megaparsecs). What would the velocity inferred from the redshift of its spectral lines be for galaxy A? Assume a Hubble constant of 73 km/s/Mpc An identical elliptical galaxy called B with exactly the same luminosity as A is found to have a redshift exactly three times that of A. How does the measured brightness of B compare to that of A?...
1.Elliptical galaxies tend to be redder in colour than spiral galaxies. Why is this? Question 10...
1.Elliptical galaxies tend to be redder in colour than spiral galaxies. Why is this? Question 10 options: A.The dust in spiral galaxies preferentially reflects blue light making the galaxy look bluer B.Elliptical galaxies have more dust which reddens the light from them. C.Elliptical galaxies have no star formation and are made of cooler, older stars. D.Elliptical galaxies are farther away so their light is red shifted more 2. Dark energy is responsible for what aspect of the universe? A.The accelerated...
8. a) Let’s say one galaxy is 4 Mpc away from us and another is 16...
8. a) Let’s say one galaxy is 4 Mpc away from us and another is 16 Mpc away. If the nearer one moves 1 Mpc, how far will the more distant galaxy move in the same amount of time? b) How far away will each of the galaxies in part A be after that amount of time has passed? 9. How would a higher value for the Hubble constant affect the calculation of the age of the universe? A lower...
Use the Hubble Law for the expansion of the Universe (Destination 16) to answer the following...
Use the Hubble Law for the expansion of the Universe (Destination 16) to answer the following questions. a) What is the distance to a galaxy with a recession velocity of 8,000 km/s for an assumed Hubble constant of 62 km/s/Mpc? b) You measure the distance to a galaxy to be 64 Mpc and its recession velocity is 7,800 km/s. What Hubble constant would you derive from this galaxy? c) What is the distance to a galaxy for which you measure...
Stars and galaxies in the distance universe are receding from us with a speed proportional to...
Stars and galaxies in the distance universe are receding from us with a speed proportional to their distance away, v = Hr, where H ≈ 73 m/s/Mpc is the Hubble constant. (a) What is the value of H in SI units? SR units? (Mpc = Mega parsec.) (b) Because they are receding from us, light received from distant stars will be red-shifted. It is common to define the dimensionless red-shift parameter z as λ/λ0 ≡ 1 + z. There is...
If a planet was located approximately 23 thousand light-years from the center of a galaxy and...
If a planet was located approximately 23 thousand light-years from the center of a galaxy and orbits that center once every 279 million years, how fast is the planet traveling around the galaxy in km/hr? If needed, use 3.0 × 108 m/s for the speed of light.
The stars, gas and dust in a galaxy rotate about the center of the galaxy. We...
The stars, gas and dust in a galaxy rotate about the center of the galaxy. We would like to know exactly how to describe the rotation of all parts of the galaxy. In other words, we want to know if galaxies rotate like merry-go-rounds, or like planets orbit the Sun, or in some other way. 1. Do points near the center of a merry-go-round complete a full rotation in the same amount of time as points near the outer edge...
(a) Galaxies emit electromagnetic radiation from the transition of electrons between different atomic orbits in hydrogen....
(a) Galaxies emit electromagnetic radiation from the transition of electrons between different atomic orbits in hydrogen. One such transition is called the Lyman-α transition. When this transition occurs in hydrogen in the lab it produces light with wavelength λemit = 121.567 nm. This transition has been observed in one of the most distant objects ever seen, called a quasar. The observed wavelength of the Lyman-α transition from the quasar is λobs = 866.0 nm. What is the redshift of the...
You observe a star orbiting the massive object at the galactic center at a speed of...
You observe a star orbiting the massive object at the galactic center at a speed of 1300 km/s in a circular orbit with a radius of 19 light-days. Calculate the mass of the object the star is orbiting. Enter in solar masses. Stars in the outskirts of a globular cluster are about 43 light years from the cluster's center, and orbit at speeds of about 9 km/s. How massive is this cluster? (answer in solar masses) A star in the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT