Dust tail--The most visible part of the comet made of dust particles from the nucleus. Dust tails are very long and smoke-like.
dust tail The component of a comet's tail that is composed of dust particles.
dwarf Any star with radius comparable to, or smaller than, that of the Sun (including the Sun itself).
dust tail
The tail of a comet which is caused by radiation pressure forcing the dust particles away from the coma in a curved arch.
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dust tail (type II): The tail of a comet formed of dust blown outward by the pressure of sunlight. (See gas tail.) ...
Dust Tail - A comet tail that is luminous because it contains dust that reflects sunlight. The dust in a comet tail is expelled from the nucleus of the comet
Dwarf - A main sequence star ...
Dust Tail: The dust tail is a long, wide tailcomposed of microscopic dust particles that are buffeted by photons emitted from the Sun; this tail curves slightly due to the comet's motion. The tail fades as the comet moves far from the Sun.
dust tail - up to 10 million km long, it is composed of smoke-sized dust particles driven off the nucleus by the escaping gases (this is the most obvious part of a comet to the naked eye); ...
Dust Tail
the most-visible part of a comet
smoke-sized dust particles up to 10 million km long
driven off the nucleus by escaping gases ...
dust tail
A stream of dust particles emitted from the nucleus of a comet. It is the most visible part of a comet.
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The dust tails forms from the solar photons colliding with the dust in the coma. The dust forms a long, curved tail that lies slightly farther our from the Sun than the nucleus' orbit. The dust tail has a yellow-white color from reflected sunlight.
Many comets have two tails, a gas tail (also called the ion tail) composed of ions blown out of the comet away from the Sun by the solar wind, and a dust tail composed of dust particles liberated from the nucleus as the ices are vaporized.
Dust tail - the dust left behind a comet, reflecting sunlight.
Eclipse - When one "body" (like the moon) passes through the shadow of another.
Fireball - an very bright meteor.
dust tail - A long, wide tail buffeted by photons emitted from the Sun, but it curves slightly due to the comet's motion.
Every comet then really has two tails, a dust tail and an ion tail. If the comet is faint, only one or neither tail may be detectable, and the comet may appear just as a fuzzy blob of light, even in a big telescope.
The dust tail is comprised of dust particles pushed out of the coma by solar radiation pressure. The long white curving tail so often photographed from Earth is the dust tail.
The dust tail can be complex, multiple and even curved but, in general, will point away from the Sun. Sometimes, due to projection effects, part of the dust tail can be seen pointing in a sunward direction.
Main Belt Comets (MBCs) are defined as objects that exhibit observable cometary activity, such as a comet-like dust tail likely driven by impact events that expose pockets of subsurface ice, but has the orbit of a main belt asteroid.
expanding "halos" triggered by outbursts in the nucleus, from the speed required to produce the Greenstein effect (see below), and from the fluid dynamics required to drag dust particles away at those places where they are observed in the dust tails.
Part of the dust tail of a comet that seems to point, often like a spike, toward the Sun.
The pressure from solar photons creates the dust tails of comets within our Solar System. Radiation pressure plays a vital role in the formation of planetary nebulae: as the dying star contracts into a white dwarf, it releases vast amounts of heat.
This dust tail has a greater curvature than the ion tail and is usually shorter. The ion tail also points away from the Sun because of the repulsive force exerted by solar radiation pressure on the minute particles.
Type I Tails are straight (ionic tails): Type II Tails are curved (dust tails, little or no charge). Dust tails are usually driven by radiation pressure; ionic (gas) tails are driven by the solar wind.
The pressure from solar photons is responsible for the creation of the dust tails in comets within our Solar System. Radiation pressure also plays a vital role in the formation of planetary nebulae.
Thus, relatively massive dust tails are accelerated slowly and tend to be curved. The ion tail is much less massive, and is accelerated so greatly that it appears as a nearly straight line extending away from the comet opposite the Sun.
Most become visible only when they get near enough to the Sun for the Sun's radiation to turn the ices directly to gas, and the gas, in turn, blows away bits of the solid material and forms the extended gas and dust tails we associate with comets.
It is straight and oriented radially away from the due to the solar wind. In type II comets, the dust tail (which is diffuse and steady) is generated by material subliming from the nucleus.
The community of astronomers decided on a new category for this object because surface reflection data revealed no evidence of a comet's dust tail. Since 1992, astronomers have located 578 trans-neptunian objects.
The other tail, the dust tail, is made up of heavier particles and is not as greatly affected by the solar wind. It has a very fuzzy appearance, often looking rather yellow-ish or whitish.
Image to left: The comet's dust tails point directly away from the Sun. The gas tails curve toward the path of the orbit. Credit: NASA ...
As the nucleus begins to disintegrate, it also produces a trail of dust or dust tail in its orbital path and a gas or ion tail pointing away from the Sun.
Comets have highly elliptical orbits. Note the two distinct tails:Cyan for gas tail, grey for dust tail ...
Comets can develop 2 tails as they travel closer to the Sun, a straight gas tail and a curved dust tail. The gas tail is created by the solar wind, whose magnetic fields pull the gas away from the comet's coma.
This 10-minute exposure was recorded at Mauna Kea Observatory on IIIa-J emulsion without filters. This image shows both the ion and dust tail, with the latter stretching for over 6 degrees on the sky.
dust tail (comet)
halo (comet)
head (comet)
intermediate-period comet (astronomy)
ionopause (astrophysics)
long-period comet (astronomy)
neglected acceleration (physics)
new comet (astronomy)
nucleus (comet)
parent molecule (astronomy) ...
 See also: Dust, Comet, Sun, Solar, Nucleus
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