r/Physics

Community Overview
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About r/Physics

For physicists and physics students. See the rules before posting, and the subreddit wiki for common questions. Basic homework questions are not allowed.

The community at a glance

r/Physics is a Subreddit for Physics with roughly 3.2M members. It uses a forum format for communication. On the Hive Index it ranks #1 in the Physics communities list.

Roughly 79K members have joined in the past year. Popular discussion topics include Physics, Quantum, and Looking For. Product recommendations often mention books and universities.

On Reddit
3.2M Members

Community Topics

Community Features

Forum

This community has a forum

Subreddit Analysis

via GummySearch
Yearly: +79K members
Growth: +2.5% / year

Member growth over time

All time (yearly)

  • 2013: 23K members
  • 2014: 24K members
  • 2015: 13K members
  • 2016: 28K members
  • 2017: 95K members
  • 2018: 358K members
  • 2019: 388K members
  • 2020: 602K members
  • 2021: 229K members
  • 2022: 286K members
  • 2023: 325K members
  • 2024: 548K members
  • 2025: 208K members
  • 2026: 59K members

Past year (monthly)

  • Oct: 3K members
  • Nov: 8K members
  • Dec: 8K members
  • Jan: 8K members
  • Feb: 7K members
  • Mar: 6K members
  • Apr: 7K members
  • May: 7K members
  • Jun: 7K members
  • Jul: 6K members
  • Aug: 6K members
  • Sep: 4K members

Topics

  • Physics
    280 posts in the past month
    #1
    Physics
    280
  • Quantum
    35 posts in the past month
    #2
    Quantum
    35
  • Looking For
    25 posts in the past month
    #3
    Looking For
    25
  • Struggling
    23 posts in the past month
    #4
    Struggling
    23
  • Theory
    20 posts in the past month
    #5
    Theory
    20

Flair

  • Question
    35 posts in the past month
    1. When something passes through a magnetic field, a current is generated. What about gravitational fields?
    2. If a frequency is defined as 1/Time period , How can Aperiodic signals have frequency component?
    3. How difficult is it to make a CFD Engine?
    #1
    Question
    When something passes through a magnetic field, a current is generated. What about gravitational fields? · If a frequency is defined as 1/Time period , How can Aperiodic signals have frequency component? · How difficult is it to make a CFD Engine?
    35
  • Image
    10 posts in the past month
    1. Recently Started Again
    2. Is there a mathematical framework for comparing “morphological disparity” across physical scales?
    3. Attempting to accurately portray vdw bonding
    #2
    Image
    Recently Started Again · Is there a mathematical framework for comparing “morphological disparity” across physical scales? · Attempting to accurately portray vdw bonding
    10
  • Meta
    3 posts in the past month
    1. Textbooks & Resources - Weekly Discussion Thread - September 18, 2026
    2. Careers/Education Questions - Weekly Discussion Thread - September 17, 2026
    3. Physics Questions - Weekly Discussion Thread - September 15, 2026
    #3
    Meta
    Textbooks & Resources - Weekly Discussion Thread - September 18, 2026 · Careers/Education Questions - Weekly Discussion Thread - September 17, 2026 · Physics Questions - Weekly Discussion Thread - September 15, 2026
    3
  • Video
    3 posts in the past month
    1. The sun might not be the center of solar system(the video is about barycenter)
    2. I made a video asking Urs Schreiber how he uses topos theory and category theory to fix problems in quantum field theory and find viable topological quantum computing materials (Not dumbed down)
    3. Gravity: Newton's cannonball
    #4
    Video
    The sun might not be the center of solar system(the video is about barycenter) · I made a video asking Urs Schreiber how he uses topos theory and category theory to fix problems in quantum field theory and find viable topological quantum computing materials (Not dumbed down) · Gravity: Newton's cannonball
    3
  • News
    2 posts in the past month
    1. Physics Ph.D. grads depart U.S. at record rates as new policies sweep science
    2. Study explores new photonics advance: Topology imprinting in nonlinear metasurfaces
    #5
    News
    Physics Ph.D. grads depart U.S. at record rates as new policies sweep science · Study explores new photonics advance: Topology imprinting in nonlinear metasurfaces
    2

Product recommendations

  • books
    10 posts in the past month
    1. Best books for undergrad quantum mechanics
    2. Best history of physics or physics adjacent books/videos/etc?
    3. Books to recommend for someone catching up with theoretical physics.
    #1
    books
    Best books for undergrad quantum mechanics · Best history of physics or physics adjacent books/videos/etc? · Books to recommend for someone catching up with theoretical physics.
    10
  • universities
    3 posts in the past month
    1. Best US universities for High Energy Theory
    2. which universities in the UK provide the best physics courses
    3. If you had no limitations and all schools were a possibility…Besides MIT what Universities on the East Coast of the USA would you recommend or attend for physics, astrophysics, math.
    #2
    universities
    Best US universities for High Energy Theory · which universities in the UK provide the best physics courses · If you had no limitations and all schools were a possibility…Besides MIT what Universities on the East Coast of the USA would you recommend or attend for physics, astrophysics, math.
    3
View full analysis on GummySearchSynced 9/20/2026

Frequently asked questions

Who is r/Physics for?
Best for Physics enthusiasts looking for a Reddit-based community with forum discussion.
Is r/Physics free to join?
This listing is not marked as paid-only. Access rules and any fees are decided by the community.
How many members does r/Physics have?
Roughly 3.2M members, based on figures reported by the community or its host. Member counts are approximate and change over time.
What platform is r/Physics on?
r/Physics runs on Reddit. Reddit communities (or "subreddits") are forum-based groups on the popular social news aggregation, web content rating, and discussion website Reddit. Reddit is commonly known as "the front page of the internet". Users submit content to the site such as links, text posts, and images, which are then voted up or down and discussed by other members. From investing Reddit communities, to professional ones, to ones just for laughs, you're likely to find a community for you on Reddit.
What topics does r/Physics cover?
On the Hive Index, r/Physics is organized under Physics.
How do I join r/Physics?
You can join r/Physics by clicking this link, or pressing the "Go to community" button above.
What are the Physics communities like?
Communities for physics students, enthusiasts, and professionals covering classical mechanics, quantum physics, relativity, and more. Facebook groups host educational content, Discord science servers mix physics with adjacent fields, and Reddit has communities for both homework help and deeper theoretical discussion.
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Added 7/3/2023

Monthly Stats

22
Views /mo
(-29%)
20
Visitors /mo
(-23%)
2
Referrals /mo
(-50%)

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