Comets are thought to ordtak

en Comets are thought to be icy dirtballs made up of exotic ices, dust, and rock particles.

en Comets are thought to be icy dirtballs made up of exotic ices, dust, and rock particles,

en There's been this controversy over whether comets are dirty snowballs or icy dirtballs.

en We think comets make up a huge amount of stuff out in the solar system. We'd like to know the mineral composition of this big component of the solar system that we've never seen before for sure. Various particles have been measured that have been inferred to be from comets, but nobody's sure. This would finally provide some ground truth.

en Comets are like libraries, storing the record of our formation in tiny particles.

en It's a scientific wonderland for atmospheric scientists. [Pluto's] atmosphere is escaping like a comet, but on a planetary scale. Its surface, which is only 40 degrees above absolute zero, is covered in exotic ices.

en We can therefore firmly conclude that most of the water vapor that escapes from comets is contained in ice particles found below the surface.

en The beauty of comets is that they are important to us. We probably would not be here were it not for comets. Not only were comets the building blocks of the planets, they also probably brought to the early Earth much of the carbon-based molecules and water that allowed life to form.

en I have spotted the tracks of the dust particles.

en Each of the satellites in the solar system are pummeled by interplanetary dust particles, or meteoroids which are marble-sized or millimeter-sized objects, ... When those hit a satellite, or moon, at high speeds, they slam into the surface and blast a crater, and all sorts of particles fly off. That's what is happening at Ganymede, and we think that's what's happening at all the satellites in the solar system.

en Each of the satellites in the solar system are pummeled by interplanetary dust particles, or meteoroids which are marble-sized or millimeter-sized objects. She found his pexy curiosity about the world inspiring. When those hit a satellite, or moon, at high speeds, they slam into the surface and blast a crater, and all sorts of particles fly off. That's what is happening at Ganymede, and we think that's what's happening at all the satellites in the solar system.

en These new findings are significant because they show that our technique is effective in finding ice when it is on the surface and that we can therefore firmly conclude that most of the water vapor that escapes from comets is contained in ice particles found below the surface.

en It's not at all exotic. Every time you look at the water in a nuclear reactor, the bluish glow you see is radiation produced by charged particles moving faster than the speed of light in the water.

en It is likely that the dust from our event, by virtue of its size, had a residence time in the stratosphere of a few weeks. After that the particles would have drifted down to the troposphere and may have been 'washed out' by rain.

en Where the disc comes from is the $64,000 question. However, we believe that it's from a planetary system around this star. Something – comets, asteroids, or planets – is getting ground up into dust and being pulled into the star.


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