# About how far away is a galaxy with a recessional velocity of 400 km/s?

Check our answers to ‘About how far away is a galaxy with a recessional velocity of 400 km/s?’ - we found 21 replies and comments relevant to this matter. The best answers are submitted by users of Yahoo! Answers, Quora and Astro.washington.edu.

## Best solution

• ### . Calculate distance of the star from the center of the Galaxy.?

The Galactic longitude of a star is l = 15°. Its radial velocity with respect to the Sun is Vr = 100 km/s. Assume stars in the disk of the Galaxy are orbiting the center with a constant velocity of V0 = 250 kms-1 in circular orbits in the same sense...

Galactic co-ordinates are centered at Sun (Solar system) located near 28000 light years from the Galactic...

## Other solutions

• ### Hubble Constant Astronomy?

Consider a galaxy at a distance of 400 million LY receding from us at a velocity, v. If the Hubble constant is 20 km/s per million LY, what is its velocity. How long ago was that galaxy right next door to our own Galaxy if it has always been receding...

maybe you should do your own homeowrk

• ### Pioneer Anomaly, Universe Expansion, Doppler Effect, all linked?

As you may know, the Pioneer spacecraft are decelerating at a faster rate than what the math dictates they should. If you take their velocity and over 1 year, say they should be at X.X in space, they are actually about 400Km closer to us than where they...

According to this article , the Pioneer Anomaly may simply be the result of the effects of electronic...

• ### According to the Hubble Law, a galaxy with a velocity of 25,000 km/s will be?

a. 100 million pcs away. b. 400 million pcs away. (I believe this is the correct answer according to the graphs of plots of recessional velocity against distance for galaxies) c. 700 million pcs away. d. 1000 million pcs away. e. less than 1 million...

V = Hd d = V/H d = 25,000/73.8 d = 338.75 mpc ≈ 400 million parsecs you got it, B is the correct...

• ### What is meant when the recessional velocity of a galaxy is quoted with respect to CMB?

I understand how the velocity of a galaxy can be measured relative to another object or point in space but not aginst a constant like hubble flow. CMB itself is presumably moving at the speed of light like all radiation. In such cases is the velocity...

No, it means "recessional velocity in the CMB rest frame," i.e. the recessional velocity as...

• ### Galaxy distance calculating?

Astronomers have measured the velocity of a star orbiting the central black hole of our own Galaxy at a distance of 2.2 × 10 10 km and found it to be 5.0 × 10 3 kms− . Calculate mass of black hole, please show me workigns so i can understand...

Hello m = mass of star, M = mass of black hole G = gravitation constant 6,67*10^-11 m3/(kgs^2) R = radius...

• ### About how far away is a galaxy with a recessional velocity of 400 km/s?

4 Mpc 6 Mpc 9 Mpc 14 Mpc

Why don't you ask the question in your own words, without the multiple choice part?

• ### Light has a speed? In relation to what? Can it be stopped?

If  I am traveling in a black vacuum at a constant velocity of 300 mph in  relation to a static object called "ball" and light travels alongside  me, would light's speed in relation to me be c or less than c?  If an inertial body, like a sun...

Wow, lots of questions! :) I'll try my best to get some of them answered! The speed of light in vacuum...

• ### Could you explain the following fallacy on frame of reference?

Distance between Earth and Moon is around 3,84,400 Kms. Rotate on a circle facing the moon in about 2 seconds. Your angular velocity w = 2* pi /2 rad/sec = 3.14 rad/sec Now,  linear velocity of the moon w.r.t you , V = W * R , R = dist. between earth...