/*! 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} Problem 13 How can Hubble's law hold withou... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 39: Problem 13

How can Hubble's law hold without the universe having a center?

Short Answer

Expert verified
Hubble's Law holds without the universe having a center because it's not the galaxies that are moving apart, it's the space between them that is expanding. This can be visualized by imagining the universe as the surface of a balloon being inflated. As the balloon inflates, the surface expands and the dots, representing galaxies, move further away from each other. Each dot sees all other dots receding away from it, yet there's no central dot from which all other dots are receding, just as there's no central point in the universe from which all galaxies are receding.

Step by step solution

01

Understand the Meaning of an Expanding Universe

Firstly, it's important to understand the concept of an expanding universe. When cosmologists say the universe is expanding, they mean that the space between galaxies is increasing. It's not that the galaxies are moving through space and getting further apart, rather the space itself is expanding and increasing the distance between galaxies.
02

Visualizing the Expanding Universe

To visualize this, think of the universe as the surface of a balloon being inflated. If there are a number of dots painted on the surface of the balloon, representing galaxies, as the balloon inflates, the dots move further away from each other, but none of them are moving on the surface of the balloon. There's no central point on the balloon's surface from which the dots are moving away.
03

Apply this knowledge to Hubble's Law

Apply the same analogy to the Universe and that's why Hubble's Law holds without the universe having a center. Under the balloon analogy, every dot sees every other dot moving away from it, seeing itself as the center, in much the same way as every galaxy sees every other galaxy moving away. Just as there's no central dot from which all other dots are receding, there's no central point in the universe from which all galaxies are receding.

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

Is the interaction \(p+p \rightarrow p+\pi^{+}\) allowed? If not, what conservation law does it violate?

Many particles are far too short-lived for their lifetimes to be measured directly. Instead, tables of particle properties often list "width," measured in energy units and indicating the width of the distribution of measured rest energies. For example, the \(Z^{0}\) has mass \(91.18 \mathrm{GeV}\) and width \(2.5 \mathrm{GeV} .\) Use the energy-time uncertainty relation to estimate its corresponding lifetime.

Name the fundamental force involved in (a) binding of a proton and a neutron to make a deuterium nucleus; (b) decay of a neutron to a proton, an electron, and a neutrino; (c) binding of an electron and a proton to make a hydrogen atom.

Why do we need higher-energy particle accelerators to explore fully the standard model?

Are either or both of these decay schemes possible for the tau particle: (a) \(\tau^{-} \rightarrow e^{-}+\bar{\nu}_{e}+\nu_{\tau} ;\) (b) \(\tau^{-} \rightarrow \pi^{-}+\pi^{0}+\nu_{\tau} ?\)
See all solutions

Recommended explanations on Physics Textbooks

Magnetism

Read Explanation

Atoms and Radioactivity

Read Explanation

Engineering Physics

Read Explanation

Modern Physics

Read Explanation

Waves Physics

Read Explanation

Electric Charge Field and Potential

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.