Given the task definition, example input & output, solve the new input case.
You are given a sentence in Polish. Your job is to translate the Polish sentence into Japanese.
Example: Wszystko jest robione pomiędzy żebrami.
Output: 全て肋骨の間から行うのです
The Polish sentence is correctly translated into Japanese, because the meaning is preserved.

New input case for you: Wcześniej wiedzieliśmy, że w tym kole była masa rzędu 4 milionów mas Słońca.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
以前から、この円の中に太陽の400万倍の質量があることがわかっていました