In certain cases, there may…………at the………… .

Explanation

To solve the question, we need to fill in the blanks based on the information provided in the transcript. The question states: "In certain cases, there may __________ at the __________."

### Step-by-Step Solution:

1. **Identify the Context**: The question relates to the concept of the center of mass in physics, particularly in scenarios where the center of mass does not contain any mass.

2. **Fill in the First Blank**: Based on the transcript, it is indicated that there may be "no mass." Therefore, the first blank should be filled with "no mass."

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