If i measure the recession velocities of 2 galaxies and galaxy a has a velocity twice that of galaxy b, the far of b if a is 200 mpc away is
100 Mpc
<h3>Further explanation
</h3>
The parsec (
) is a unit of length used to measure the large distances to astronomical objects outside the Solar System.
Although parsecs are used for the shorter distances within the Milky Way, multiples of parsecs are also required for the larger scales in the universe such as Kiloparsecs (kpc) is for the more distant objects within and around the Milky Way, megaparsecs (Mpc) for mid-distance galaxies, and gigaparsecs (Gpc) for many quasars and the most distant galaxies.
If i measure the recession velocities of 2 galaxies and galaxy a has a velocity twice that of galaxy b, how far away is b if a is 200 mpc away? Remember that 
galaxy A: 

galaxy B: 100 Mpc
<h3>Learn more</h3>
- Learn more about the recession velocities brainly.com/question/12578064
- Learn more about galaxy brainly.com/question/3358187
- Learn more about mpc brainly.com/question/3191068
<h3>Answer details</h3>
Grade: 9
Subject: physics
Chapter: the recession velocities
Keywords: galaxy, the recession velocities, velocity, mpc, measure, far away
Answer: C. Galactic disk
Explanation:
The part of the Milky Way which allows the determination of it rotational direction is known as the Galactic disk. This disc are shaped because they contain gases which are rich and dynamically young. It is also a part of a group of a galaxies disc is a component of disc galaxies, known as spiral galaxies and lenticular galaxies.
The answer is easy if you know the physics.
<span>a/a' = (r/R)^2 = (r/9r)^2 = 1/81; so that a = a'/81.
A's radial acceleration must be 1/81 of B's. And each acceleration is a = v^2/R and a' = V^2/r, where v and V are the tangential speeds you want the ratio for. </span>
<span>a = v^2/R = v^2/9r = V^2/81r = a'/81 In which case v^2/V^2 = 9/81 = 1/9; so that 1/3 = Va/Vb ANS</span>
The correct answer would be B. The first level contains two and the second level contains six holding a total of eight, the reason eight aren't just in one row is because only two fit in the first row.