| In this region they would have been safe from late meteoritic and cometary impacts after the accretion of the Earth. |
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| These presumably cometary bodies, which reach several hundred kilometers in size, are vulnerable to severe perturbations by these planets. |
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| Indeed, the outermost asteroids show similarities with the cometary nuclei observed far from the Sun. |
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| Another difficulty that must be resolved is the current uncertainty about the consistency of cometary nuclei. |
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| By the final moments, cometary dust will have abraded the camera's optics, degrading the quality of the images, and possibly ending transmission. |
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| This discovery conforts the analogy between interstellar matter and cometary material, which could have formed following similar processes. |
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| These files contain, for all comets of cometary Notes, osculating orbital elements. |
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| One theory, for instance, holds that cometary impacts seeded the newly formed Earth with much of its water. |
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| In the 1970s Mr Marsden, well established as one of the leading calculators of cometary orbits, suggested that they might have been wrong. |
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| The identification of volatile compounds present in the ices of cometary cores is not easy. |
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| Ethylene glycol and all other cometary molecules are indeed present in interstellar ices or in the hot molecular cores of interstellar clouds. |
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| Relegated to the borders of the Solar system in a very cold environment, the cometary cores evolved very little since their formation. |
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| With ten atoms, ethylene glycol is now the most complex molecule identified in cometary atmospheres. |
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| Already in July 2009 he had detected the scar of a recent cometary impact in the upper atmosphere of Jupiter. |
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| Our understanding of astronomy has shown us that cometary and asteroidal impacts are relatively commonplace over timescales of hundreds of millions of years. |
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| Late tonight, and in the early hours of tomorrow morning, the Northern Hemisphere will be witness to a different sort of cometary light show: the Perseid meteor showers. |
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| The compounds are observed in a gaseous state in the cometary atmosphere. |
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| Other highlights range from the detection of supernovae at distances that will allow us to measure the geometry of space-time, to studies of the Kuiper belt cometary objects. |
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| Indeed, the space exploration of Halley's comet indicated the presence of complex molecules composed of carbon, hydrogen, oxygen and nitrogen, especially in the organic mantles coating cometary dust particles. |
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| Several of the cometary molecules were never observed in other objects of the Solar system whereas they are present in the star forming regions of the interstellar medium, more specifically in the molecular hot cores. |
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| The story is that of Frank Poole, killed off by Hal the computer in 2001, whose body is discovered in the icy cometary regions around the solar system, and revived. |
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| Odin is thus well suited for the study of water, the main constituant of cometary ices, released as water vapour following heating of cometary nuclei by the Sun. |
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| The cometary nucleus is the fifth to have been visited by a spacecraft. |
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| Impacts on planetary surfaces by falling meteoroids, asteroids, and cometary bodies are periodic but are capable of generating landforms of mountainous proportions. |
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| The composition of cometary ices provides key information on the chemical and physical properties of the outer solar nebula where comets formed, 4.6 Gy ago. |
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| About two dozen molecules released from the sublimation of nucleus ices have been identified in cometary atmospheres, mainly by infrared and microwave spectroscopy. |
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| The simulated kuiperoidal dust, in addition to asteroidal and cometary dust, might represent a third possible source of the zodiacal light in the Solar system. |
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