Planet Definition and 821 Threads

There's a planet with a moon that orbits the plant in 30 days and moves at a distance of 370million meters from the center of the planet. i need to find the mass of the planet and I've used the following equation that was derived from the keplers laws: P = 2pi(a^(3/2))/(GM)^(1/2). P is the time...

Q: The residents of a small planet have bored a hole straight through its center as part of a communications system. The hole has been filled with a tube and the air has been pumped out of the tube to virtually eliminate friction. Messages are passed back and forth by dropping packets through...

I believe man evolved to invent the microchip. Communication is a natural self organizing principle of nature. This is inevitable as water running down hill, or the formation of snow flakes. The Components of the universe organize around the a flow of information. These currents can be gravity...

A speck of crystal is the oldest bit of Earth found according to this article: http://www.foxnews.com/story/0,2933,152930,00.html How in the world (pun intended) does one set out looking for the oldest bits? …

In a planet, if the spin numbers were +1/2, 0 , and -1/2 and their magnetic quantum numbers take the values 0, 1, 2,...L ( Everything else including the ordering and naming of the orbits are same except the spin numbers and the magnetic quantum numbers as provided above.) how would the...

Check it out! Cool!

Why is it difficult to measure the perihelion advance of the planet Venus? Please help me answer this question in details...Thank you~ :smile:

Is it possible for a planet to be filled with electricity and lightning, like lightning storms all year 'round?

Would it be just a terrestrial planet with a similar amount of water and oxygen as Earth? and of course similar distance from the sun or would it have to really resemble Earth? The former one I don't think would be all that rare but the latter one would really really be rare, exceedingly rare.

In the figure the blue planet has a period of 1 year and an average distance from the sun of 1.73 x 1011 meters. If the average distance from the sun for the red planet is 1.39 x 1011 meters, what is its period to the nearest hundredth of a year? So I thought maybe they through in the...

i was hoping somebody could give me a hand with a homework problem i have . first here's the question . -> Planet X has two satellites . A and B . Both orbits are circular . Satellite A's orbital radius is 4 times B's orbital radius . calculate the following ratios . a) A's orbital...

Given: G = 6.67259 x 10^11 N x m^2/kg^2 A small Moon of a planet has an orbital period of 1.86 days and an orbital radius of 485000 km. What is the mass of the planet?

Posted this on the homework page, got no replyies so thought I'd try here. It's no longer "homework", already sent in my work! I have seen several references which give the pressure at the center of the Earth at about 3 x 10^11 Pa. (I've seen 3.0 - 3.6). An earlier post on this forum gives...

I have seen several references which give the pressure at the center of the Earth at about 3 x 10^11 Pa. (I've seen 3.0 - 3.6). An earlier post on this forum gives the equation for the pressure at the center of a planet as 2*(pi*G/3)*(R^2)*(rho)^2. When I crunch the numbers, I get 1.73 x...

A hypothetical spherical planet consists entirely of iron. What is the period of a satellite that orbits this planet just above its surface? Im stumped :/ density of iron is 7860 kg/m^3

long ago and far away there was a planet that had a reducing atmosphere like Titan, the air there was mostly nitrogen like our air but instead of oxygen it had some percentage methane so sugars and fats were useless as foods because there was no oxygen to metabolize them, you would not, for...

If you were a planet which would you be? I'd be mercury because itz da hottest... :cool:

i have read yesterday in one of our local newspapers that some physicians said that tsumani increased the speed of our planet (3 microseconds) and this caused a move of 2.5 cm of the Earth from its orbit. though it's not a big deal but this can rarely happen. for whom have got somthg to say...

Has there ever been a hypothesis or theory propsed (current or obsolete) proposing that the rocky planets formed from gas giants whose ring system collapsed and combined with the core of the gas giant forming the bulk of a new rocky planet? Just wondering if this has ever been proposed or...

hi Im stuck on how to do this question ...can anyone give me any hints : The American artificial planet Pioneer IV reached its closest approach to the sun 91.7 million mi on march 17 1959. At aphelion it will be 106.1 million mi from the sun. What is: a.) the speed at which it passed...

Since I was a young Earthling, I had been told that Pluto was the ninth and outmost planet of our solar system. More recently, I have heard that Pluto did not form with the rest of our planets, had actually been captured late in the game, and therefore was not a planet at all. Today I...

http://hosted.yourimg.com/04/313/03/sorryworld1.jpg From sorryeverybody.com http://72.3.131.10/

I have been wondering that is that possible a planet to be destroyed like what happened in Star Wars? Is it possible to destroy a planet? Will a planet destruct by itself? What are planet's vital point?

Despite Jupiter's gravitational tides, is the asteroid belt gradually coalescing into a planet(esimal) to rival Mercury (and Pluto) in size?

Would it be possible for a planet by collecting gas to become a star. I mean if it were to collect enough hydrogen, the temperature and the pressure at the surface of the planet could get high enough to start fusion ?

There are many more objects in our solar system besides planets. The astroid belt is full of big rocks. Why do we not consider them planets? Or what is the minimum size of a planet. And what is the minimum size of a moon? There are a lot of small rocks around saturnus, how big must they...

here is the question, the mysterious planet pyramid travels around its sun in a circular orbit. The radius of this planet is 2.69e^7 m and the mass is 3.06e^25 kg . The radius of orbit of pyramid is 1.15e^11 m and the period is 6.34e^7 s . The mass of pyramids sun is 9.22e^31 and the...

ok let's say there is a ship 100ft long moving at .90c. a planet perpendicular has guns 101ft apart at rest. the guns line of fire are parrallel to each other. the planet plans it out so that the ship will be in between the bullets when the ship flies past the planet. would the bullets hit the...

http://news.bbc.co.uk/2/hi/science/nature/3644410.stm "Astronomers working in Chile think they may have taken the first direct image of a planet circling another star. The star, called 2M1207, is 230 light-years away and is very much smaller and fainter than our own Sun." I'm gazing at...

when you are in orbit and want to escape the gravity of a planet completely, what is the impulse/direction which would require the least effort? would it be a push in the direction you are moving already, or one(p=mv) in the direction exactly opposite of the center of the planet? and would it...

I going to get straight to the point here. During the "Great Flood" the Earth was submerged with water. I cannot calculate how much water that would have to be, or how much that water weighed, but I can guess that all that water did weigh quite a bit. Now with the added weight on the Earth...

http://www.cnn.com/2004/TECH/space/08/26/new.planet/index.html The system has two other outer gas planets, which makes it more similar to our own solar system than anything else found so far.

[FONT=Comic Sans MS] [COLOR=LightBlue] Okay, this is a general question.. i just read this thread (https://www.physicsforums.com/showthread.php?t=28343) and started wondering about it. THis planet is considered "young", and it is a million years old. SO, my question was why does planet formation...

This has been bothering me for some time, no one has a good answer to it. I read a while ago some information about the meaning of "planet" and it said that Pluto isn't a planet, that there are just 8 planets in our solar system. Why? I read that the meaning of "planet" is: A solitary body, for...

Does anyone know anything about a tenth planet (a planet that orbits outside of pluto's and neptune's orbits) that was discovered a few months ago?

How much gold is there on planet Earth, rough estimates in tonnes ?

Seeing "The Chronicles of Riddick" there is described a planet subject to melting distruction should one be caught out in the sunlight during its sun-star passover. Apparently things are O.K. if one stays in the shade. This has been thought not too scientific even by Ebert, a movie critic...

One of NASA's space telescopes has discovered what scientists believe may be the youngest planet ever spied -- a celestial body that at 1 million years old or less is a cosmic toddler. Spitzer is an infrared telescope that has been orbiting the sun and studying the universe since last...

Amazing Note to the moderators, please change the title of the thread to "young planet" This is not a planet formed 1 million years after BB, evidently i was completely stupid to think that http://www.newscientist.com/news/news.jsp?id=ns99995052 "An infant planet just a million years old...

Telescope spies 'youngest' planet An impression of what it might be like in the CoKu Tau 4 system Nasa's Spitzer telescope has found evidence around a distant star for a planet that may be less than one million years old. The infrared space observatory studied five stars in the...

What are some of the more unusual planetary compositions you can imagine? I envisioned a planet embodying exuded, colorful petro-plastics - like a "Lego Land." Earth itself is pretty strange with its lifeforms. I guess science fiction is replete with creative orbs.

http://news.bbc.co.uk/2/hi/science/nature/3707185.stm The historic first image of a planet circling another star may have been taken by the Hubble Space Telescope. The "planet", 5-10 times the mass of Jupiter, is orbiting a small white dwarf star about 100 light-years away. Astronomers...

Any ideas on the potential overpopulation of the planet? How close are we? Solutions?

Could Sedna be a trapped rogue planet due to the nature of its distant and highly eccentric orbit? Could a trip to Sedna thus be useful?

Problem 9. If a ball is thrown vertically upward on the planet Zeno at 100m/s, then it's approximate height in meters t seconds later is given by h(t)=45t-9t^2. a.After how many seconds does the ball hit the ground? b. How high does the ball go?

The search for extraterrestrial intelligence has been narrowed down to planets that are similar to earth. If a planet is hazardous to Earth life, then it is said to be inhabitable. Is that right? If so, WHY? After all, we can only define life according to what we have here on Earth. Something...

Wow: No sooner did the media herald the discovery of a "new Planet" that astronomers began to question whether it should be called a planet at all. Along with Pluto, it looks like both are in for a sharp degrade of status from Planet to mere planetisimal. Is this right ? Or should we...

Scientists find "10th Planet" http://www.cnn.com/2004/TECH/space/03/14/planet.discovery/index.html

Why electrons do a circumferential motion under the magnetic force and planets do a elliptical motion under the gravity? I don't understand this because the magnetic force and the gravity are all central force. Can anyone tell me what's the difference between them, in words, mathematics or in...

A gas giant planet, its hydrogen and helium having been substantially ripped from it, is now having its CNO bones flayed by the UV and high temperature whips of its parent... "The planet, called HD 209458b, may sound familiar. It is already an extrasolar planet with an astounding list of...