If you want to describe something that is widely circulated or widely known, you can say that it is "common knowledge" or "well-known." For example, you might say:

"It's common knowledge that the earth is round."

"The fact that the earth orbits the sun is well-known."

You could also use the verb "circulate" to describe something that is widely disseminated or widely shared. For example:

"This rumor has been circulating for weeks."

"These ideas have been circulating among the scientific community for years."

Finally, you could use the phrase "going around" to describe something that is widely circulated or widely shared. For example:

"There's a rumor going around that the company is going to lay off a lot of employees."

"There's a story going around that the singer is going to perform at the music festival."

I hope this helps! Let me know if you have any other questions.