comets
... ices on the comet surface depending upon the orientation of the spin axis of the nucleus, may increase or decrease the orbital period. At perihelion the rate of nucleus heating varies greatly over each cometary spin orbit, because comet nuclei are rotating. Axial tilt of the comet nucleus is random ...
... ices on the comet surface depending upon the orientation of the spin axis of the nucleus, may increase or decrease the orbital period. At perihelion the rate of nucleus heating varies greatly over each cometary spin orbit, because comet nuclei are rotating. Axial tilt of the comet nucleus is random ...
Extrasolar Kuiper Belt Dust Disks
... (Backman and Paresce, 1993). Because all the above timescales are generally much shorter than the age of the disk, it is inferred that the observed dust is not primordial but is likely produced by a reservoir of undetected kilometersized planetesimals producing dust by mutual collisions or by evapor ...
... (Backman and Paresce, 1993). Because all the above timescales are generally much shorter than the age of the disk, it is inferred that the observed dust is not primordial but is likely produced by a reservoir of undetected kilometersized planetesimals producing dust by mutual collisions or by evapor ...
The Physics and Chemistry of Nebular Evolution
... can make up as much as 80% of the volume of a given meteorite. Chondrules are roughly millimeter-sized, igneous, ferromagnesium silicates that are considered to be evidence for transient heating events in the early solar system (Connolly et al., 2006). In addition to chondrules, refractory objects c ...
... can make up as much as 80% of the volume of a given meteorite. Chondrules are roughly millimeter-sized, igneous, ferromagnesium silicates that are considered to be evidence for transient heating events in the early solar system (Connolly et al., 2006). In addition to chondrules, refractory objects c ...
The Origin of Comets - Wesley Grove Chapel
... interactions with other particles. Particles in the swarm, colliding with gas molecules, would gently settle toward the swarm’s center of mass. How gently? More softly than large snowflakes settling onto a windless, snowcovered field. More softly, because the swarm’s gravity is much weaker than Eart ...
... interactions with other particles. Particles in the swarm, colliding with gas molecules, would gently settle toward the swarm’s center of mass. How gently? More softly than large snowflakes settling onto a windless, snowcovered field. More softly, because the swarm’s gravity is much weaker than Eart ...
Kepler Mission
... partly caused by its closeness to Kepler 2 which has a photospheric temperature of 6350 Kelvin, a temperature greater than our own Sun. Kepler 2 is larger than the Sun (1.991 solar radii) and more massive (1.52 solar masses) too.3 After these first two observations of stellar systems within our Milk ...
... partly caused by its closeness to Kepler 2 which has a photospheric temperature of 6350 Kelvin, a temperature greater than our own Sun. Kepler 2 is larger than the Sun (1.991 solar radii) and more massive (1.52 solar masses) too.3 After these first two observations of stellar systems within our Milk ...
Lokal fulltext - Chalmers Publication Library
... Kuiper belt, EKB, after Kenneth Edgeworth and Gerard Kuiper). The observer might even be able to observe the Zodiacal cloud, an inner debris disc produced by the asteroid belt which stretches inwards from ∼ 4 AU radius towards the Sun. Both of these discs would have very weak emission. The solar sys ...
... Kuiper belt, EKB, after Kenneth Edgeworth and Gerard Kuiper). The observer might even be able to observe the Zodiacal cloud, an inner debris disc produced by the asteroid belt which stretches inwards from ∼ 4 AU radius towards the Sun. Both of these discs would have very weak emission. The solar sys ...
Earth and Our Solar System File
... ‘gone wild’) • Winds reach 360 km/hour No Messing Resources c ...
... ‘gone wild’) • Winds reach 360 km/hour No Messing Resources c ...
Meteorites
... • Most meteorites come from the asteroid belt. At one point in time, most meteorites were part of an asteroid. • However, some rare types of meteorites have come from the Moon and the planet Mars. Some scientists suspect that a very rare meteorite type may have come from comets. • Oldest thing you c ...
... • Most meteorites come from the asteroid belt. At one point in time, most meteorites were part of an asteroid. • However, some rare types of meteorites have come from the Moon and the planet Mars. Some scientists suspect that a very rare meteorite type may have come from comets. • Oldest thing you c ...
Full text - FNWI (Science) Education Service Centre
... greater) almost on a weekly basis. In fact, over half of the extrasolar planets found up till July 2nd 2012 had masses greater than Jupiter (www.exoplanet.eu/). Since a Jupiter or Saturn mass planet is needed for the ejection of comets, it can be assumed that the major planets of other star systems ...
... greater) almost on a weekly basis. In fact, over half of the extrasolar planets found up till July 2nd 2012 had masses greater than Jupiter (www.exoplanet.eu/). Since a Jupiter or Saturn mass planet is needed for the ejection of comets, it can be assumed that the major planets of other star systems ...
The Origin and Evolution of Dust in Galaxies
... Star formation rate (SFR) > Gas injection rate from SNe and AGB LMC star formation depends on the large reservoir of existing ISM gas The LMC is getting gas poorer. The SFR is likely to be declining with time. Chemical evolution of the LMC ISM is very slow process (~1 Gyrs) – ISM gas : 8x108 Msun (H ...
... Star formation rate (SFR) > Gas injection rate from SNe and AGB LMC star formation depends on the large reservoir of existing ISM gas The LMC is getting gas poorer. The SFR is likely to be declining with time. Chemical evolution of the LMC ISM is very slow process (~1 Gyrs) – ISM gas : 8x108 Msun (H ...
Carl Sagan - Cosmos (1980) [Full Color Illustrated
... sponding chapter of this book; and I like to think that the plea sure of each will be enhanced by reference to the other. For clarity, I have in a number of cases introduced an idea more than once—the first time lightly, and with deeper passes on subsequent appearances. This occurs, for example, in ...
... sponding chapter of this book; and I like to think that the plea sure of each will be enhanced by reference to the other. For clarity, I have in a number of cases introduced an idea more than once—the first time lightly, and with deeper passes on subsequent appearances. This occurs, for example, in ...
The Oort Cloud
... would not be much perturbed by typical passing stars nor by the gravity of the planets of the solar system, and the comets could reside in the inner cloud or belt for long periods of time without detection. It has been speculated, however, that a rare close passage by another star (possibly an undet ...
... would not be much perturbed by typical passing stars nor by the gravity of the planets of the solar system, and the comets could reside in the inner cloud or belt for long periods of time without detection. It has been speculated, however, that a rare close passage by another star (possibly an undet ...
A New Science Strategy for Space Astronomy and Astrophysics
... NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee ...
... NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee ...
The Perseid Meteor Shower
... form a tail that we can see from Earth. Unlike meteors, which zip across the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, ...
... form a tail that we can see from Earth. Unlike meteors, which zip across the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, ...
R585 EXPLORERS OF THE SOUTHERN SKY
... 527 - history of astronomy This well-illustrated volume is the most conprehensive account of Australian astronomy to date. It is both an indispensabel reference book on the history of astronomy in Australia and a highly readable study of a scientific discipline in the context of emerging nationhood. ...
... 527 - history of astronomy This well-illustrated volume is the most conprehensive account of Australian astronomy to date. It is both an indispensabel reference book on the history of astronomy in Australia and a highly readable study of a scientific discipline in the context of emerging nationhood. ...
Brochure - Institut für Raumfahrtsysteme
... formed at low temperatures as well as minerals that must have been formed at high temperatures. Other research indicates a very wide range of olivine and low-Calcium pyroxene compositions in the same comet. Such results imply different formation locations in the protoplanetary disk. Although comets ...
... formed at low temperatures as well as minerals that must have been formed at high temperatures. Other research indicates a very wide range of olivine and low-Calcium pyroxene compositions in the same comet. Such results imply different formation locations in the protoplanetary disk. Although comets ...
docx file
... Explanation: In 1996, an unexpectedly bright comet passed by planet Earth. Discovered less than two months before, Comet C/1996 B2 Hyakutake came within only 1/10th of the Earth-Sun distance from the Earth in late March. At that time, Comet Hyakutake, dubbed the Great Comet of 1996, became the brigh ...
... Explanation: In 1996, an unexpectedly bright comet passed by planet Earth. Discovered less than two months before, Comet C/1996 B2 Hyakutake came within only 1/10th of the Earth-Sun distance from the Earth in late March. At that time, Comet Hyakutake, dubbed the Great Comet of 1996, became the brigh ...
Evolution of Circumstellar Disks Around Normal Stars
... Over the past 10 years abundant evidence has emerged that many (if not all) stars are born with circumstellar disks. Understanding the evolution of post–accretion disks can provide strong constraints on theories of planet formation and evolution. In this review, we focus on developments in understan ...
... Over the past 10 years abundant evidence has emerged that many (if not all) stars are born with circumstellar disks. Understanding the evolution of post–accretion disks can provide strong constraints on theories of planet formation and evolution. In this review, we focus on developments in understan ...
Astronomy and Astrophysics (ASTRO) Iowa State University – 2013-2014 1
... ASTRO 405. Astrophysical Processes. (Dual-listed with ASTRO 505). (3-0) Cr. 3. F. Prereq: ASTRO 346 or permission of instructor Survey of astrophysical processes relating to stars, galaxies and the Universe. Radiation transport, radiation processes, scattering, kinetic description of plasma, hydrody ...
... ASTRO 405. Astrophysical Processes. (Dual-listed with ASTRO 505). (3-0) Cr. 3. F. Prereq: ASTRO 346 or permission of instructor Survey of astrophysical processes relating to stars, galaxies and the Universe. Radiation transport, radiation processes, scattering, kinetic description of plasma, hydrody ...
PDF only - at www.arxiv.org.
... rotational smearing effect of the atmospheric spectral lines due to the rapid rotation of Jupiter and Saturn. As a result the retrieval of vertical profiles of all species will extend to higher altitudes. Besides water at least PH3, NH3 and CH4 in Jupiter and Saturn and HCN and CO ...
... rotational smearing effect of the atmospheric spectral lines due to the rapid rotation of Jupiter and Saturn. As a result the retrieval of vertical profiles of all species will extend to higher altitudes. Besides water at least PH3, NH3 and CH4 in Jupiter and Saturn and HCN and CO ...
interstellar dust - Ira-Inaf
... To observe a significant degree of polarization the grains must be well aligned. There is such a rich variety of physical conditions in the ISM, that different mechanisms are likely to take place. The polarization of dust radiation therefore provides valuable information on various astrophy ...
... To observe a significant degree of polarization the grains must be well aligned. There is such a rich variety of physical conditions in the ISM, that different mechanisms are likely to take place. The polarization of dust radiation therefore provides valuable information on various astrophy ...
Dirty Snowballs - Amazon Web Services
... predicted. Sightings that were once believed to be different comets, turned out to be sightings of returning comets. Edmund Halley was, at first, surprised to see significant similarities in comets seen in 1531, 1607, and 1682. Careful study helped him realize those were sightings of the same comet ...
... predicted. Sightings that were once believed to be different comets, turned out to be sightings of returning comets. Edmund Halley was, at first, surprised to see significant similarities in comets seen in 1531, 1607, and 1682. Careful study helped him realize those were sightings of the same comet ...
Trapezium Fracture
... back across the immense gulf of space to the last remnants of our own solar system and begin to understand the ultimate of their own world? Perhaps these beings will not have evolved on the Orion home worlds at all, but travelled to them from another distant place, and when they peer curiously at ou ...
... back across the immense gulf of space to the last remnants of our own solar system and begin to understand the ultimate of their own world? Perhaps these beings will not have evolved on the Orion home worlds at all, but travelled to them from another distant place, and when they peer curiously at ou ...
Issue #8 - 2014 July - National Space Society
... But there were some notable successes regardless of what ultimately happened to the rocket stage. Musk considers the attempt a success in that they were able to control the boost stage to a zero roll rate which is what previously destroyed the stage. The goal is to land rocket stages back on Earth i ...
... But there were some notable successes regardless of what ultimately happened to the rocket stage. Musk considers the attempt a success in that they were able to control the boost stage to a zero roll rate which is what previously destroyed the stage. The goal is to land rocket stages back on Earth i ...
The Habitability of Planets Orbiting M
... Observational Landscape and Demographics of M-dwarf Planets 3.1 RV Planets and the dearth of Gas Giants, metallicity effects . . 3.2 MEarth, GJ 1214b, and TRAPPIST . . . . . . . . . . . . . . 3.3 Microlensing and Direct Imaging . . . . . . . . . . . . . . . . 3.4 The Kepler Sample . . . . . . . . . ...
... Observational Landscape and Demographics of M-dwarf Planets 3.1 RV Planets and the dearth of Gas Giants, metallicity effects . . 3.2 MEarth, GJ 1214b, and TRAPPIST . . . . . . . . . . . . . . 3.3 Microlensing and Direct Imaging . . . . . . . . . . . . . . . . 3.4 The Kepler Sample . . . . . . . . . ...
Panspermia
Panspermia (from Greek πᾶν (pan), meaning ""all"", and σπέρμα (sperma), meaning ""seed"") is the hypothesis that life exists throughout the Universe, distributed by meteoroids, asteroids, comets, planetoids and, also, by spacecraft in the form of unintended contamination by microorganisms.Panspermia is a hypothesis proposing that microscopic life forms that can survive the effects of space, such as extremophiles, become trapped in debris that is ejected into space after collisions between planets and small Solar System bodies that harbor life. Some organisms may travel dormant for an extended amount of time before colliding randomly with other planets or intermingling with protoplanetary disks. If met with ideal conditions on a new planet's surfaces, the organisms become active and the process of evolution begins. Panspermia is not meant to address how life began, just the method that may cause its distribution in the Universe.Pseudo-panspermia (sometimes called ""soft panspermia"" or ""molecular panspermia"") argues that the pre-biotic organic building blocks of life originated in space and were incorporated in the solar nebula from which the planets condensed and were further —and continuously— distributed to planetary surfaces where life then emerged (abiogenesis). From the early 1970s it was becoming evident that interstellar dust consisted of a large component of organic molecules. Interstellar molecules are formed by chemical reactions within very sparse interstellar or circumstellar clouds of dust and gas. The dust plays a critical role of shielding the molecules from the ionizing effect of ultraviolet radiation emitted by stars.Several simulations in laboratories and in low Earth orbit suggest that ejection, entry and impact is survivable for some simple organisms.