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Originally posted by gam3pr0
when will we pass through it?
Originally posted by gam3pr0
and what effects will it have?
Originally posted by gam3pr0
is there any conclusive evidence of something being in there that we should be worried about?
Originally posted by gam3pr0
what's the likely hood of our system being binary?
Originally posted by gam3pr0
also, will elenin bombard our planet with things that are follow it?
Originally posted by Phage
The "wake" of a comet is being pushed from the comet, it doesn't "pull" anything.
Originally posted by Phage
A larger object, co-orbital with the comet, would be just as detectable as Elenin itself.
Well, our object collison budget's a million dollars. That allows us to track about 3% of the sky, and beg'n your pardon sir, but it's a big-ass sky.
The Perseid meteor shower is peaking this week and announced its annual August arrival with a bright fireball over Alabama, NASA officials say.
A small 1-inch (2.5-cm) wide meteor caused the fireball when it met a fiery demise Aug. 3 while streaking through Earth's atmosphere, according to officials at NASA's Marshall Space Flight Center in Huntsville, Ala.
As a comet passes near the sun in its orbit, the outer surface exposed to sunlight is vaporized and ejected in spectacular jets and streams, freeing large amounts of loosely aggregated clumps of dust and other non-volatile materials.
These freshly generated cometary meteoroids, often called “dustballs” will roughly continue to follow the orbit of the parent comet, and will form a meteoroid stream.
Based upon photographic fireball studies, cometary meteoroids have extremely low densities, about 0.8 grams/cc for class IIIA fireballs, and 0.3 grams/cc for class IIIB fireballs. This composition is very fragile and vaporizes so readily when entering the atmosphere, that it is called “friable” material. These meteoroids have virtually no chance of making it to the ground unless an extremely large piece of the comet enters the atmosphere, in which case it would very likely explode at some point in its flight, due to mechanical and thermal stresses.
In the mid-1980s, the astronomers Tamas I. Gombosi and Harry L.F. Houpis first suggested that the nuclei of comets consist of relatively large boulders cemented together by a ‘glue’ of smaller particles and ice. If the rocky and icy nucleus of a comet disintegrates, then these large boulders are set loose into space.
From these trajectory measurements, bolides have been found to have many different orbits, some clustering in streams often associated with a parent comet, others apparently sporadic. Debris from bolide streams may eventually be scattered into other orbits. The light spectra, combined with trajectory and light curve measurements, have yielded various compositions and densities, ranging from fragile snowball-like objects with density about a quarter that of ice, to nickel-iron rich dense rocks.
Astronomers have analyzed the cometary fireball that blazed across the sky over Europe last year and concluded it was a dense object, about a meter (3.2 feet) across and with a mass of nearly two tons – large enough that some fragments probably survived intact and fell to the ground as meteorites.
Originally posted by afp928
So i followed the instructions at and this is what I got
[IMG=http://img38.imageshack.us/img38/5052/094610311316515.jpg][/IMG]
What is that?
Yes, I know comets disintegrate into large fragments. I pointed that out. That's not really the same as ejecting larger chunks as they go.
If the rocky and icy nucleus of a comet disintegrates, then these large boulders are set loose into space.
Guess which ones are cometary. Guess which ones are asteroidal.
The light spectra, combined with trajectory and light curve measurements, have yielded various compositions and densities, ranging from fragile snowball-like objects with density about a quarter that of ice, to nickel-iron rich dense rocks.
www.universetoday.com...
This orbit is very similar to that of a cloud of meteoroids known as the Omicron Draconids, which on rare occasions produces a minor meteor shower and probably originates from the breakup of Comet C/1919 Q2 Metcalf in 1920. The authors suggest the boulder was once embedded in the nucleus of that comet.