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Following its Thanksgiving Day brush with solar fire, sundiving Comet ISON is now just a cloud of dust. Among experts, a consensus is building that the comet broke apart shortly before perihelion (closest approach to the sun).
After perihelion, the comet emerges as a diffuse remnant of its former self. No one knows for sure what is inside that fan-shaped cloud. Possibilities include a small remnant nucleus or a "rubble pile" of furiously vaporizing fragments.
reply to post by 1questioner
I am not an astrology buff just a reader of astrology news but from what I have read the trajectory of the remaining mass should still follow the original path and not change. Ison has not behaved as a normal comet in many instances ( not in any doom porn way please folks) growing brighter when it was in a position that it shouldn't have at the time etc. We have added to the data we have collected over the centuries with this one that's for sure.
I am actually very disappointed that it dove because I remember Hale Bopp and I was looking forward to the show. So far Hale Bopp is the all time winner in my lifetime as I live in the northern hemisphere. I think lovejoy was the king down under.edit on 2-12-2013 by AutumnWitch657 because: (no reason given)
reply to post by 1questioner
You guys are so funny.
Is it a bird , is it a plane , no its a dirty snow ball that didn't melt near the Sun. Why? , the Sun wasn't hot enough.
The Sun is more likely to vaporize a comet that is mostly ice than it would a comet that is more dust than ice.
than it would a comet that is more dust than ice
The temperature at the surface of the Sun is about 10,000 Fahrenheit (5,600 Celsius). The temperature rises from the surface of the Sun inward towards the very hot center of the Sun where it reaches about 27,000,000 Fahrenheit (15,000,000 Celsius). The temperature of the Sun also rises from the surface outward into the Solar atmosphere. The uppermost layer of the Solar atmosphere, called the corona, reaches temperatures of millions of degrees. The corona is the bright halo of light that can be seen during a total Solar eclipse.
If they enter the Sun's corona, maybe. Outside of the corona space is not really hot (nor is it cold).
Seems to me "Dirty Snowballs " with those types of temperatures wouldn't have a chance of getting anywhere near the Sun.
If they enter the Sun's corona, maybe.
One of the most puzzling features of the Sun is what has been dubbed "the solar corona problem." There is a region around the Sun, extending more than one million kilometers from its surface, where the temperature can reach two million degrees.
The problem is, no one can really explain how this corona exists. Even if the temperature in the core of the Sun does reach 15 million degrees, it drops to a mere 5000 degrees at the surface. The temperature should be even lower farther away from the Sun, but the temperature of the corona is measured at more than a million degrees. This incredibly hot temperature requires a permanent heating mechanism, or the plasma would cool down in about an hour. There are many mechanisms which could heat some gas above the surface of the Sun, but none of those mechanisms could account for the large rate of heating necessary to heat the corona to these temperatures. This phenomenon remained a mystery for more than 50 years
Using data from instruments onboard the SOlar and Heliospheric Observatory (SOHO) and from the more recent Transition Region And Coronal Explorer (TRACE), solar physicists have identified small patches of magnetic field covering the entire surface of the Sun. Contrary to the bright, large magnetic field loops which are linked to the "active regions" during periods of solar maxima, these patches seem to appear and disappear randomly in time scales on the order of 40 hours. Scientists now think that this magnetic carpet is probably a source of the corona's heat.
What Is Mercury Like?
The surface of Mercury looks like Earth's moon. It is covered with holes. The holes are called impact craters. The craters were made by rocks falling from space. The rocks are going very fast when they hit Mercury. A hole is made where the rock hits. Earth has a blanket of air around it. Mercury does not. The blanket is what helps keep Earth from getting too hot or cold. Because it is so close to the sun, Mercury can be very hot. At night, Mercury gets very cold. We could not live on Mercury!
Mercury's eccentric orbit takes the small planet as close as 47 million kilometers (29 million miles) and as far as 70 million kilometers (43 million miles) from the sun. If one could stand on the scorching surface of Mercury when it is at its closest point to the sun, the sun would appear more than three times as large as it does when viewed from Earth. Temperatures on Mercury's surface can reach 430 degrees Celsius (800 degrees Fahrenheit). Because the planet has no atmosphere to retain that heat, nighttime temperatures on the surface can drop to -180 degrees Celsius (-290 degrees Fahrenheit).
I mentioned the thermosphere to show how, even though it is very hot, it doesn't really affect objects (like the ISS) within it.
So your Earth example does not apply as Mercury doesn't have an atmosphere.
From much farther than that. It is the heating of the comet which causes the coma (and tail) to form. But it is only the surface of the nucleus which gets heated. BTW, heat does not radiate through matter but it can be conducted. But in the case of a comet (like an ice cube) the surface heats, releases gas and vapor (and dust in the process). It, in effect, ablates. And the heat consumed by the ablation process keeps the interior from heating. The middle of an ice cube does not get higher than 0ºC. How hot did the surface of the comet get a perihelion? Doesn't matter much because the inside was still very cold. Cold that is, until the comet broke up because of gravitational effects (tides).
Although the Comet is much smaller than Mercury (NASA) , then there would also be enough heat from the sun facing side to radiate through the smaller combined mass of the Comet to begin to heat the ice from about at least a million kilometres from the Sun.