Where can I ask a physics question?

r/AskPhysics takes questions about physics at any level. Homework is allowed only if you show your own attempt, and it does not accept AI-generated text for checking. For coursework in general, the homework-help page covers communities built for that.

Where to ask

r/AskPhysics

Best for: Conceptual physics questions and curiosity questions at any level.

Why it fits: A physics question-and-answer community whose rules require questions to be relevant to physics and answers to be on-topic and correct.

Members in our directory: 1.6M

Rules to know before posting:

• Questions must be relevant to physics.
• No cheating on schoolwork; show your own attempt on homework-style questions.
• No posting AI- or LLM-generated content to ask whether it makes sense.
• If a question goes unanswered for a day, the rules suggest the weekly Tuesday thread in r/Physics (not for homework).
• Be civil.

Read r/AskPhysics’s current rules on Reddit

Before you post

• Say what level you are at, so answers can pitch the maths appropriately.
• Explain what you already understand and exactly where it breaks down.
• For space and astronomy questions, the astronomy-question page lists a dedicated community.

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Rule summaries are paraphrased from each community’s published rules (public archive copy retrieved 7 November 2026; original snapshot date unavailable). Current rules may differ — check the community’s rules before posting. A good fit does not guarantee a reply.