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Arnold11
Since Pluto is no longer considered a planet, the correct answer would be Neptune. It is eight and farthest known planet of the Solar system. Orbital period of planet Neptune is 168 years. So planet Neptune has completed less than one orbit around the Sun in the last 100 years. 
snehashish65

Answer:

The Neptune is the planet that has completed less than one orbit of sun in last 100 years.

Explanation:

The orbital period of planets in a solar system are given as follows:

1. Mercury  - 88 days

2. Mars - 687 days

3. Venus - 225 days

4. Jupiter - 12 years

5. Earth - 365 days

6. Saturn - 29 years

7. Uranus - 84 years

8. Neptune - 165 years

9. Pluto - 248 years

Since, pluto is not considered as a planet. So, Neptune is the planet that has completed less than one orbit of sun in last 100 years.

For more details, refer to the link:

https://brainly.com/question/14494804?referrer=searchResults

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