Connected with albedo, Kuiper's belt etc.?
930949
Hi. Albedo results from two properties, reflectance and illumination. The illumination follows the inverse square law so, knowing the distance, you can calculate the actual illumination. Diameter vs albedo is a tougher problem because as one goes up the other goes down. If you assume a relatively pristine ice body you can make a pretty good guess. Short of an occultation that seems to be about as good as you can get.
365807
Orbits of planets\n\nBending of light\n\nParabolic trajectories\n\nTides\n\nRiver flow\n\netc\n\netc\n\netc
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This directory should give you the north polar CC for all the planets out to Pluto; the southern ones should be easy to extrapolate from these figures.\n\nhttp://nssdc.gsfc.nasa.gov/planetary/planetfact.html
454895
It's actually a composite of photos (as are most photos of space).  Some more information is here:\n\nhttp://antwrp.gsfc.nasa.gov/apod/ap000828.html\n\nwww.snopes.com has some information as well.  Type in Eye of God in the search box.
1023046
http://www.bbc.co.uk/science/horizon/2004.shtml\n\nhas a complete list\n\nhope this helps!
966458
Earth at Aphelion Search\nhttp://search.yahoo.com/search;_ylt=A0oGkk9cFFFFkDYAzqlXNyoA?p=earth+aphelion&prssweb=Search&ei=UTF-8&fr=yfp-t-501&x=wrt\n\nMoon near Apogee, Earth near Perihelion\nhttp://www.fourmilab.ch/images/peri_apo/\n\nEarth at Aphelion\nhttp://www.spaceweather.com/glossary/aphelion.html\n\nPictures\nhttp://images.search.yahoo.com/search/images?p=earth%20aphelion&prssweb=Search&ei=UTF-8&fr=yfp-t-501&x=wrt&fr2=tab-web
3840
Wikipedia has an excellent article on this.  According to them, there are 3 main theories:\n\n1. Asteroid collision\n\nBasically a huge rock hit our planet causing a plum of sediment to float into our atmosphere reducing light from the sun.  This reduction killed off a huge portion of the existing plant life, thus wiping out the food supply for many animals.  As one thing leads to another, massive extinctions followed.\n\n2. The Oort cloud\n\nSimilar to the asteroid theory, an Oort cloud is a literal storm of comets.  The results follow pretty closely with the single asteroid theory.\n\n3. Environment changes\n\nThis is a little more vague, but also a little simpler to prove to a degree (pun intended).  The theory follows the notion of the magnetic poles flipping (causing tremendous weather changes), or some other massive event (such as the melting of the caps, or an ice age) that would in turn kill off most of the larger species on the planet.\n\nFor further information, please read the wikipedia article.
620232
Kuiper belt objects are primarily comets past the planets orbit. When a Kuiper belt object falls in to the orbit it is considered a comet. If a comet hits earth it is considered a meteorite
266887
Before the NASA satellite orbiting the sun had it's photographic information "pulled" from the web, it showed two distinct and large objects executing a right-angle turn right into the sun.  Planets, asteroids, etc. have no way of ever executing 90 degree turns naturally (as far as human understanding is at this time.) Why the information was pulled off the web--well there are a billion consipiracy theories about that, and I will skip it.  With proper technology, it is obvious to me the sun can be penetrated, and it well may be a portal to another dimension or whatever.  A black hole on "the other side" may appear as a sun here, and vice-versa.  If we exist in a fractal universe, there are three things: here, there, and the boundary between here and there.  This set of three keeps repeating infinitely.  Therefore the sun's energy producing layer may be a boundary to be passed through to get from "here" to "there."  Cool--huh?  Some very excellent minds are hard at work trying to further our understanding of the universe.
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The link below has great overview info and statistics (including density) for all the planets, asteroids, comets, etc. \n\nCheck it out!
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no the fourth planet from the sun.put me on best answer please!\n\nHappy Trails ♥!
1037864
There are a large number of balls of ice and rock of various sizes scattered around the solar system. Some are small enough that they are irregularly shaped. Some have highly elliptical orbits. Some are very, very small.  So part of the difficulty is that there is not an agreed upon definition of what a 'planet' really is. By one definition, Pluto is not a planet, but rather is the first of a class of medium sized balls of ice and rock to be discovered at the edges of our system (the Kuiper belt objects). There are many others, some of which are comparable in size. Furthermore, these objects are far enough away from the sun that they don't reflect much light back to us, so they are very hard to locate.\n\nOn the other hand, we can estimate the distances to some fairly bright galaxies and determine that they are billions of light years away. That means that the light from these galaxies has taken a billion years to get to us. That, in turn, means that we are seeing now what happened there billions of years ago. This allows us to say what the universe was like at that time with some confidence.
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It has to do with the formation of the planets from the solar nebula based on the "nebular hypothesis."  That is why they are all on different orbits.
883197
There is much information you have not given but try this reference as it may help:\n\nhttp://www.du.edu/~jcalvert/astro/gnomon.htm
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Discovery of the 10th planet!  Recent discovery.  Not much info. yet so no one can say if you are wrong on any point!
35715
Check http://www.wunderground.com/sky/index.asp
1010412
It might be Seti@Home...\nIt's to look for extra terrestrials...\nhttp://setiathome.berkeley.edu/