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. It is the 1st largest community in the Physics topic page.
Roughly 72K members have joined in the past year. Popular discussion topics include Physics, Quantum, and Looking For. Product recommendations often mention books and universities.
Community Topics
Community Features
This community has a forum
Subreddit Analysis
via GummySearchMember 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: 47K members
Past year (monthly)
- Aug: 2K members
- Sep: 2K members
- 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: 4K members
Topics
- Physics280 posts in the past month#1280Physics
- Quantum35 posts in the past month#235Quantum
- Looking For25 posts in the past month#325Looking For
- Struggling23 posts in the past month#423Struggling
- Theory20 posts in the past month#520Theory
Flair
- Question58 posts in the past month
- How can I self-study theoretical physics while pursuing a different degree?
- Is there any advantage to the Lagrangian formulation of general relativity compared to the Hamiltonian formulation?
- How much should I worry about job security in Physics given recent AI developments?
#158QuestionHow can I self-study theoretical physics while pursuing a different degree? · Is there any advantage to the Lagrangian formulation of general relativity compared to the Hamiltonian formulation? · How much should I worry about job security in Physics given recent AI developments? - Image27 posts in the past month
- How can a person generate that much movement that it makes you do entire 360° mid air cartwheel just by being hit on your foot? (ask physics)
- European map of most famous physicists according to Wikipedia
- What exactly are EM waves?
#227ImageHow can a person generate that much movement that it makes you do entire 360° mid air cartwheel just by being hit on your foot? (ask physics) · European map of most famous physicists according to Wikipedia · What exactly are EM waves? - Meta10 posts in the past month
- Physics Questions - Weekly Discussion Thread - July 07, 2026
- Careers/Education Questions - Weekly Discussion Thread - July 16, 2026
- Careers/Education Questions - Weekly Discussion Thread - July 09, 2026
#310MetaPhysics Questions - Weekly Discussion Thread - July 07, 2026 · Careers/Education Questions - Weekly Discussion Thread - July 16, 2026 · Careers/Education Questions - Weekly Discussion Thread - July 09, 2026 - Video6 posts in the past month
- Synthetic prequantum field theory in a cohesive homotopy topos --- Urs Schreiber
- Probably this has been posted before, but it's so cool CERN has this in their youtube page,
- What really happens in the quantum world? In this conversation, physicist and philosopher Sean Carroll explores some of the biggest quandaries in quantum mechanics: the famous double-slit experiment, wave function collapse, the many worlds interpretation, and the arrow of time.
#46VideoSynthetic prequantum field theory in a cohesive homotopy topos --- Urs Schreiber · Probably this has been posted before, but it's so cool CERN has this in their youtube page, · What really happens in the quantum world? In this conversation, physicist and philosopher Sean Carroll explores some of the biggest quandaries in quantum mechanics: the famous double-slit experiment, wave function collapse, the many worlds interpretation, and the arrow of time. - News3 posts in the past month
- Dark energy flips its sign, but the Hubble tension refuses to budge
- CUNY physicists recreate black hole energy extraction in a historic lab experiment
- How a new magnetic design could supercharge industrial plasma
#53NewsDark energy flips its sign, but the Hubble tension refuses to budge · CUNY physicists recreate black hole energy extraction in a historic lab experiment · How a new magnetic design could supercharge industrial plasma
Product recommendations
- books10 posts in the past month
- 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.
#110booksBest 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. - universities3 posts in the past month
- 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.
#23universitiesBest 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.
Community Reviews
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.
Monthly Stats
- 9
- Views /mo (-25%)
- 7
- Visitors /mo (-42%)
- 0
- Referrals /mo
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