Does any1 know the characteristics of Halleys Comet or a site that has the characteristics? (mass density etc)
955086
Wikipedia.com has it all.
151685
not sure of web site but think it's http://www.hubble.com,or you can try NASA's web site,either should might be of use/help.
1165787
Try this:\nhttp://www.braeunig.us/space/
10667
Here is a link that should be perfect! Scroll down a bit and there is a table with all the data you could possibly want!  http://en.wikipedia.org/wiki/2003J6%28moon%29--_statistics_of_Jupiter%27s_Moon
540756
check out this site for general information\nwww.nineplanets.org/sol.html \n\nhttp://sohowww.nascom.nasa.gov/\n\nhttp://www.spaceweather.com/\n\n\nthese are just some sites. is there anything in particular that you would like to know about the sun??
1165999
There are several comets every year that are visible in binoculars or a small telescope. The recent passage of 73P/Schwassmann-Wachmann was particularly interesting because the comet broke into pieces. \n\nAbout the only bright comet in a regular, predictable orbit is Halley, and it won't be back for another fifty years. Comets like Hale-Bopp are rare, coming along maybe every twenty years on average. These large bright comets pass through our solar system after getting kicked out of the Oort cloud by some gravitational disturbance.  The Oort cloud is a huge spherical cloud of cometary bodies that surrounds the sun at a distance of about a light year. It is too far away to be observable, so we have no idea when the next big comet will come. Hale-Bopp was discovered twenty months out, so you could get plenty of advance notice. However, other, smaller comets sometimes put on a spectacular display on short notice, if they pass very close to the Earth.\n\nThere are links below to some comet observation sites. You will see that there are always comets around, but most of them are strictly telescopic objects.
902786
Imagine how hard it is to try to teach High Schoolers anything about the planets when one of them has a name like this! But anyway, go to NASA's website. There is a place there where you can find anything worth seeing at any location. It will even tell you when stuff like the Space Station will fly overhead. And most telescopes come with locating software if you ever get that involved. I hope you will. It seems like we never learn much about space, but it has taken a long time to get as far as we are now.
1179134
It would be so helpful if, when providing proof of something, there was actually a whit of truth to what you have to say.  Not only is most of what you've said untrue, it simply doesn't make sense.\n\nHowever, not being one to just say that and not back it up.\n\n1)  A planet sized comet wouldn't be generating a large magnetic field because comets are made of ice and (mostly carbonaceous) dust, two things which are most notably not magnetic.\n\n2)  No scientist worth his salt yet has indicated there's any evidence of massive "plasma scarring" on the surface of Mars, and if one did, it would be from plasma hitting the surface of Mars.  While the Sun and other stars are made out of the stuff, comets completely lack it and magnets don't create it, even if one magnetic field comes into alignment with another one, which brings us to...\n\n3)  Mars has no significant magnetic field.  It has a few magnetic patches on it where there is probably quite a bit of iron concentrated, but it's not magnetic in the least (as a whole planet, in the fashion of, say, the Earth).  It has no magnetic poles, either... and since you can't demagnetize an object with another magnetic field, it couldn't have ended up that way because another magnet "stripped off" it's magnetic field, and in any case you've said Mars absorbed all the energy... so it should be absolutely glowing on the magnetic front, and it isn't.\n\nSo, your theory is that an object which we know has no significant magnetic field (Mars) and an object which we know cannot have a magnetic field (a comet) got together and flipped magnetic poles which didn't exist when you said this event took place, in this massive magnetic tango that produced a product it could not have produced (plasma), that literally fired right through Mars like a gun and, even though it shot straight through the core from one non-existent magnetic pole through the other, didn't destroy the planet from the inside out, but left it completely in tact and just burned off the northern hemisphere, totally defying just about every one of the Laws of Physics God created the Universe to run on because, perfect being that He is, He was too incompetent to get it right the first time and needed to make a trial run which, as a compassionate and merciful God, He decided to burn to a crisp and roast alive every living thing on rather than allow to live on in peace once it had served His purposes, because He just didn't feel bothered to have them around any more.\n\nYou're right.  That's a freaking miracle.\n\n\nP.S.-- Craters naturally fill in from the center out because the edges of the crater are protected by the wall, leaving the center of the crater where dust can be most easily blown and settle, and there are dust storms on Mars.  Also, cooling cracks are very regular things, as the contracting matter pulls evenly away from the weakest point, most often causing the split to be very even and straight.  There's nothing about those features on Mars (or the shield volcanoes, for that matter) we haven't seen happen endless times on Earth-- and directly witnessed in other planetary bodies in the Solar System, which is why we know what made them.\n\nEdit:  All right, let's do this.  First, as for comets:\n\nhttp://www.windows.ucar.edu/cgi-bin/tour_def/comets/comets.html\n\nhttp://www.solarviews.com/eng/comet.htm\n\nhttp://solarsystem.nasa.gov/planets/profile.cfm?Object=Comets&Display=Kids\n\nEveryone from the sixth grade on but you seemed to learn in science class what comets were made of, and most of us quite a bit sooner.  They're made out of ICE and DUST.  Because of the severely black color of them and our analysis of the gases in the comet's coma (you know, that big gas cloud you see around the comet that, oddly, is made out of ice and dust), we're pretty darned sure a lot of that dust contains CARBON, so they're made
586535
A continuing effort to identify even near Earth asteroids which are relatively easy to track and have a greater possibility of collision is still incomplete, with only a fraction of their orbits plotted. Since the orbital periods of comets and other Oort cloud entities are in the tens, hundreds, or even thousands of years, many of these objects have never been seen in recorded history, much less their orbits calculated and possibility of collision with Earth evaluated. With this in mind, an event such as this might be possible at any point in the future, although since objects from the outer solar system tend to be rather reflective, chances are that they would be spotted and we would have some advance warning of a likely intersection with Earth orbit presenting a cause for concern. That said, the chance of it happening in any particular year is extremely remote, the likelihood of it happening sometime in the next several million years greater.
460102
Depends on the size of the comet, many just disintegrate on the atmosphere. A really big one could create:\nShift in the orbit, heat from the explosion, smoke and dust from the explosion covering the Sun. Earthquakes and volcanic eruptions from shift in magnetic field due to orbit shift. Basically extinction of many forms of life, possibly even human.
784997
Here's a quick visualization:\n\nhttp://www.chm.davidson.edu/ChemistryApplets/AtomicOrbitals/hybrid.html
1033922
these might help you\n\nhttp://science.nasa.gov/headlines/y2001/ast30nov_1.htm\n\nhttp://www.seds.org/spaceviews/9711/features.html\n\nhttp://realmagick.com/articles/86/1786.html
516884
For more info that you could possibly want to know:\nhttp://en.wikipedia.org/wiki/Jupiter_(planet)
632386
look here:\n\nhttp://neo.jpl.nasa.gov/cgi-bin/neo_ca\n\nselect what you want to see displayed from the pop-up menus and select display table.  try selecting "PHAs (Potentially Hazardous Asteroids)" from the first pop-up menu.
376133
Never heard about it. There are many places in the web \n\nhttp://astronomylinks.com/solar_system/planets/\nhttp://www.absoluteastronomy.com/\nhttp://curious.astro.cornell.edu/planets.php
134289
There are several things. Right now comet Pojmanski is visible in the morning sky. Also Mercury is visble. In a month the Lyrid metershower will peak. Events like these are constantly posted on www.spaceweather.com
469212
See if this helps.\n\nhttp://hyperphysics.phy-astr.gsu.edu/hbase/atomic/hund.html