The planet is about 2.4 times the radius of Earth?

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So the planet is about (2.4x2.4x2.4) times the volume of Earth?

Because the ball volume formula is:

http://dl.zhishi.sina.com.cn/upload/11/96/21/1085119621.2268460.JPG

In it, R is Radius of the ball.

Context:

The newly confirmed planet, Kepler-22b, is the smallest yet found to orbit in the middle of the habitable zone of a star similar to our sun. The planet is about 2.4 times the radius of Earth. Scientists don't yet know if Kepler-22b has a predominantly rocky, gaseous or liquid composition, but its discovery is a step closer to finding Earth-like planets.

http://www.nasa.gov/mission_pages/kepler/news/kepscicon-briefing.html[img][/img]

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Type: Question • Score: 5 • Views: 920 • Replies: 12

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View best answer, chosen by oristarA

@oristarA,

Do you have a question about this, Ori?

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@oristarA,

That's a fallacy of composition, not all balls are created equal. It is not known if this planet is a "rocky" planet, or a very small "gas giant." So little is known about the planet, other than its proximity to its local star and is apparent size that it would be very hasty to make any statements about it other than the few bald statements already offered by the NASA team in charge of Kepler. It it's gaseous, where does that actual planet end and the atmosphere start?

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I believe scientists are looking for habitable planets in the wrong places i.e. they're looking for planets like ours, in orbit around stars like ours, at something like our distance.

Far more common in our galaxy are planets in very close orbit around red dwarf stars; that I believe would be the most likely place to find living worlds like ours.

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Well, your arguments are reasonable, guys. A cool head to observe any discoveries is vital, no doubt about that.

But my question remains unanswered - the exact meaning of "2.4 times the radius of Earth."

2 Replies

@oristarA,

Which of the terms 2.4, times, radius and earth are alien to you?

1 Reply

@oristarA,

You are correct in your original read. The radius of the planet is estimated at 2.4x that of Earth and the volume would be 2.4^3 higher. The mass depends on the material it is composed of but you are correct on the volume.

1 Reply

@fobvius,

fobvius wrote:

Which of the terms 2.4, times, radius and earth are alien to you?

None.

0 Replies

@engineer,

engineer wrote:

You are correct in your original read. The radius of the planet is estimated at 2.4x that of Earth and the volume would be 2.4^3 higher. The mass depends on the material it is composed of but you are correct on the volume.

Thanks a lot.

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Did you know how to calculate the volume of a pie?

Let the height be a, and the radius z

then it's

pizza

1 Reply

@McTag,

McTag wrote:

Did you know how to calculate the volume of a pie?

Let the height be a, and the radius z

then it's

pizza

Sweet.

But equation would be sweeter; see what Albert had said. Very Happy

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@oristarA,

oristarA wrote:

So the planet is about (2.4x2.4x2.4) times the volume of Earth?

I wonder how NASA would know that in the first place. (Your link doesn't work for me.) Normally, planets are detected by observing wobbles in their suns' positions, which in turn are detected through Doppler shifts in their spectral lines. This evidence contains no information about a planet' radius and density.

1 Reply

@Thomas,

Thomas wrote:

oristarA wrote:
So the planet is about (2.4x2.4x2.4) times the volume of Earth?

I wonder how NASA would know that in the first place. (Your link doesn't work for me.) Normally, planets are detected by observing wobbles in their suns' positions, which in turn are detected through Doppler shifts in their spectral lines. This evidence contains no information about a planet' radius and density.

http://www.nasa.gov/mission_pages/kepler/news/kepscicon-briefing.html

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The planet is about 2.4 times the radius of Earth?

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