[Answer] Roughly how often is Halley's Comet visible from Earth?\u00a0

Step 1 : Introduction to the question "Roughly how often is Halley's Comet visible from Earth?\u00a0"

...1. Every 75 years
2. Every 25 years
3. Every 55 years
4. Every 100 years

Step 2 : Answer to the question "Roughly how often is Halley's Comet visible from Earth?\u00a0"

Every 75 years:

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