Last seen in 1986, _______ comet appears after nearly every 76 years.

Explanation

To solve the question, we will identify the comet that was last seen in 1986 and has a periodic appearance of approximately every 76 years.

### Step-by-Step Solution:

1. **Identify the Comet**: The question states that the comet was last seen in 1986. We need to recall which comet fits this description.

2. **Recall the Characteristics**: We know that there are comets that have periodic appearances. One of the most famous comets is Halley's Comet, which is known for its regular return.

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