User talk:174.17.134.136

March 2021
Hello, I'm Saadrafiq4. I noticed that you added or changed content in an article, Penrose diagram, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at the tutorial on citing sources. If you think I made a mistake, you can leave me a message on my talk page.   — Saadrafiq4 (talk) 04:44, 25 March 2021 (UTC)
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 * If this is a shared IP address, and you did not make the edits referred to above, consider creating an account for yourself or logging in with an existing account so that you can avoid further irrelevant notices.