/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q2CQ If there is no observable edge t... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 34: Q2CQ (page 1236)

If there is no observable edge to the universe, can we determine where its centre of expansion is? Explain.

Short Answer

Expert verified

We can't pinpoint its centre of expansion because each observer believes he is in the centre, which shouldn't be possible if the centre is unique.

Step by step solution

01

Definition of centre of expansion.

The point in space from which all other points are moving away is known as the centre of expansion. A plethora of astronomical observations have revealed that the universe is, in fact, expanding. These observations form the basis for the theory that the universe began with a Big Bang.

02

Explaining whether we can determine centre of expansion of universe?

We can't pinpoint its centre of expansion because every observer in the universe detects galaxies moving away from him and from each other, giving him the impression that he is in the centre. The uniqueness of a point with this property would imply that we have discovered a centre of expansion, but because this is true for all observers, we can only conclude that the universe is expanding universally.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Lacking direct evidence of WIMPs as dark matter, why must we eliminate all other possible explanations based on the known forms of matter before we invoke their existence?

Another known cause of red shift in light is the source being in a high gravitational field. Discuss how this can be eliminated as the source of galactic red shifts, given that the shifts are proportional to distance and not to the size of the galaxy.

Find the approximate mass of the luminous matter in the Milky Way galaxy, given it has approximately\({\rm{1}}{{\rm{0}}^{{\rm{11}}}}\)stars of average mass\({\rm{1}}{\rm{.5}}\)times that of our Sun.

(a) Use the Heisenberg uncertainty principle to calculate the uncertainty in energy for a corresponding time interval of\({\rm{1}}{{\rm{0}}^{{\rm{ - 43}}}}{\rm{ s}}\). (b) Compare this energy with the\({\rm{1}}{{\rm{0}}^{{\rm{19}}}}{\rm{ GeV}}\)unification-of-forces energy and discuss why they are similar.

(a) Estimate the mass of the luminous matter in the known universe, given there are\({\rm{1}}{{\rm{0}}^{{\rm{11}}}}\)galaxies, each containing\({\rm{1}}{{\rm{0}}^{{\rm{11}}}}\)stars of average mass\({\rm{1}}{\rm{.5}}\)times that of our Sun. (b) How many protons (the most abundant nuclide) are there in this mass? (c) Estimate the total number of particles in the observable universe by multiplying the answer to (b) by two, since there is an electron for each proton, and then by\({\rm{1}}{{\rm{0}}^{\rm{9}}}\), since there are far more particles (such as photons and neutrinos) in space than in luminous matter.
See all solutions

Recommended explanations on Physics Textbooks

Measurements

Read Explanation

Energy Physics

Read Explanation

Magnetism

Read Explanation

Electrostatics

Read Explanation

Electricity and Magnetism

Read Explanation

Circular Motion and Gravitation

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.