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a. Mercury
b. Jupiter
c. Saturn
d. Pluto

2007-03-13 14:43:28 · 9 answers · asked by Anonymous in Science & Mathematics Astronomy & Space

9 answers

The one furthest out. Pluto still a planet in your text?

2007-03-13 14:47:54 · answer #1 · answered by Mike1942f 7 · 0 0

The short answer is Saturn.

Pluto is no longer considered a planet but instead is refered to as a Dwarf Planet.

The orbital period for Saturn is 10759 days or a little less than 29 1/2 years.

That is given the 4 choices your provided.

Of al the full planets Neptune has the longest orbital period of about 165 years.

If you include the Dwarf Planets Pluto would have the 2nd longest orbital of all Planets and Dwarf Planets. Pluto's obrbital period is not quite 248 years.

The farthest dwarf planet yet discovered, Eris, has an orbital period of about 557 years.

2007-03-13 22:01:28 · answer #2 · answered by Rick G 2 · 1 0

First, Pluto is no longer a planet.
Second, I assume you mean the longest year based on earth days. So since a planet's orbit is longer and slower the farther it is from the sun, then the planet with the longest year is the one furthest from the sun.
That's all I'm going to tell you, you figure out the answer. You need to do your own homework

2007-03-13 22:44:41 · answer #3 · answered by Anonymous · 0 0

Pluto approx 248 Earth Years.

2007-03-17 02:49:46 · answer #4 · answered by kwilfort 7 · 0 0

Well since pluto is not a planet, the real answer is neptune. However if this is a (old) standardized test question, the answer would be pluto.

2007-03-13 21:52:50 · answer #5 · answered by Tony 2 · 0 0

I'm pretty sure a "year" is defined as one rotation around the sun. So.. the longest year would mean the planet furthest away from the sun as it would have a much larger path to cover... so my "educated" guess is Pluto.

2007-03-13 21:46:56 · answer #6 · answered by MQ 2 · 0 0

Well, since Pluto is no longer considered a planet, the correct answer is not here. It is Neptune.

2007-03-13 21:48:42 · answer #7 · answered by Curiosity 7 · 1 0

Pluto would be the answer but it got de-planeted. so take the next closest Neptune, Uranus. so if that list the answer is Saturn.

2007-03-13 22:20:39 · answer #8 · answered by Mr. Smith 5 · 1 0

Saturn

2007-03-13 21:46:41 · answer #9 · answered by dirka 3 · 0 1

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