Eight billion asteroids in the Oort cloud
... We plot the fate of particles after 4.5 Gyr of evolution in Fig. 1. Beyond 1.5 au, ejection is the most common outcome for particles which are lost. Interior to 1.5 au, no single outcome dominates, with ejection, and collisions with Earth, Venus, and the Sun all important. The majority of particles ...
... We plot the fate of particles after 4.5 Gyr of evolution in Fig. 1. Beyond 1.5 au, ejection is the most common outcome for particles which are lost. Interior to 1.5 au, no single outcome dominates, with ejection, and collisions with Earth, Venus, and the Sun all important. The majority of particles ...
Proposal - ESA Science
... a huge range of masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface of their host star. However, the essential nature of these exoplanets remains largely mysterious: there is no known, discernible pattern linking the presence, size, or orbital parameters o ...
... a huge range of masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface of their host star. However, the essential nature of these exoplanets remains largely mysterious: there is no known, discernible pattern linking the presence, size, or orbital parameters o ...
The Origin of Comets - Wesley Grove Chapel
... influence would grow, so fewer particles would escape by chance 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. M ...
... influence would grow, so fewer particles would escape by chance 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. M ...
Absolute Flux Calibration
... - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
... - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
The Legacy of Galileo - Keck Institute for Space Studies
... should be bound to confess your opinion to be true.”7 This was the point, the philosopher and the theologian would have not agreed to change their views based on the experiment if the experimental evidence was against Aristotle’s teachings. The thinking of Galileo, like that of other great scientist ...
... should be bound to confess your opinion to be true.”7 This was the point, the philosopher and the theologian would have not agreed to change their views based on the experiment if the experimental evidence was against Aristotle’s teachings. The thinking of Galileo, like that of other great scientist ...
Analysis of Angular Momentum in Planetary Systems and Host Stars
... Main Sequence host stars range from 0.6 to 1.7 solar masses, and their angular momenta are shown to agree well with previous studies of stellar angular momentum, generally falling on or below the appropriate power law, and exhibiting detection method biases. The systems’ angular momenta, including ...
... Main Sequence host stars range from 0.6 to 1.7 solar masses, and their angular momenta are shown to agree well with previous studies of stellar angular momentum, generally falling on or below the appropriate power law, and exhibiting detection method biases. The systems’ angular momenta, including ...
The Oort Cloud
... Modern estimates range from 1 to 100 Earth masses. Part of the uncertainty concerns the reality of a hypothesized massive "inner Oort cloud" -- or "Kuiper belt" (if the distribution is flattened)--of comets that would exist at distances from the Sun 40 to 10,000 times that of the orbit of the Earth. ...
... Modern estimates range from 1 to 100 Earth masses. Part of the uncertainty concerns the reality of a hypothesized massive "inner Oort cloud" -- or "Kuiper belt" (if the distribution is flattened)--of comets that would exist at distances from the Sun 40 to 10,000 times that of the orbit of the Earth. ...
Instruction Manual
... second roller bearing plate. Place the top part of the base plate assembly over the center bearing bushing. To secure in place: On the adjustment knob bolt, place two washers on either side of the roller bearing washer. Slide the adjustment bolt through the top base board and into the center bearing ...
... second roller bearing plate. Place the top part of the base plate assembly over the center bearing bushing. To secure in place: On the adjustment knob bolt, place two washers on either side of the roller bearing washer. Slide the adjustment bolt through the top base board and into the center bearing ...
How we found about COMETS
... 2. Distance and orbits The first person to consider comets thoughtfully was a reek philosopher named Aristotle who lived more than 2000 years ago. About 350 BC, he decided that since all the objects in the sky moved in regular paths, comets, because of their irregular behavior, could not be objects ...
... 2. Distance and orbits The first person to consider comets thoughtfully was a reek philosopher named Aristotle who lived more than 2000 years ago. About 350 BC, he decided that since all the objects in the sky moved in regular paths, comets, because of their irregular behavior, could not be objects ...
114EQ-AR
... yes you can! The most common mistake of the beginning observer is to “overpower” a telescope by using high magnifications which the telescope’s aperture and atmospheric conditions cannot reasonably support. Keep in mind that a smaller, but bright and well-resolved image is far superior to one that i ...
... yes you can! The most common mistake of the beginning observer is to “overpower” a telescope by using high magnifications which the telescope’s aperture and atmospheric conditions cannot reasonably support. Keep in mind that a smaller, but bright and well-resolved image is far superior to one that i ...
The Origin of Comets and the Oort Cloud
... 2. Some early cometary observations are quoted by Olivier (in “Comets”, 1930). Thus, on a Bablyonian tablet dated around 1140 BC and referring to a military campaign, we read: “a comet arose whose body was bright like the day, while from its luminous body a tail extended, like the sting of a scorpio ...
... 2. Some early cometary observations are quoted by Olivier (in “Comets”, 1930). Thus, on a Bablyonian tablet dated around 1140 BC and referring to a military campaign, we read: “a comet arose whose body was bright like the day, while from its luminous body a tail extended, like the sting of a scorpio ...
Solar Superstorms and Planetary Alignments
... an iron core that comprises roughly 85 percent of the planet's radius. (For comparison, Earth's iron core covers about half of its radius.) Scientists had suspected the planet's core is big, but many will be surprised that it's so gigantic, Zuber said. Further, it looks like a layer of solid iron su ...
... an iron core that comprises roughly 85 percent of the planet's radius. (For comparison, Earth's iron core covers about half of its radius.) Scientists had suspected the planet's core is big, but many will be surprised that it's so gigantic, Zuber said. Further, it looks like a layer of solid iron su ...
The Cosmos & the Bible
... The Solution to Olbers' Paradox • Analogous to question of how deep one must go into woods to see only tree trunks all around. • To have a dark sky, universe must not be deep enough to see only star surfaces in all directions. • Thus the universe is of finite age, or finite size, or average star den ...
... The Solution to Olbers' Paradox • Analogous to question of how deep one must go into woods to see only tree trunks all around. • To have a dark sky, universe must not be deep enough to see only star surfaces in all directions. • Thus the universe is of finite age, or finite size, or average star den ...
MEADE INSTRUCTION MANUAL
... through the eyepiece in the diagonal mirror and turn the focuser knob (23) until the image is sharply focused. Center the object precisely in the eyepiece’s field of view. 2. Look through the red dot viewfinder. Turn one or more of the viewfinder’s alignment screws (3) until the red dot is precisely ...
... through the eyepiece in the diagonal mirror and turn the focuser knob (23) until the image is sharply focused. Center the object precisely in the eyepiece’s field of view. 2. Look through the red dot viewfinder. Turn one or more of the viewfinder’s alignment screws (3) until the red dot is precisely ...
asteroid wise - Lawrence Hall of Science
... we use celestial coordinates. Celestial coordinates are to the sky, as geographical coordinates (latitude and longitude) are to the Earth. Review of Geographical Coordinates The Earth’s spin determines special locations on Earth. The spin axis goes through the North and South Poles, and midway betwe ...
... we use celestial coordinates. Celestial coordinates are to the sky, as geographical coordinates (latitude and longitude) are to the Earth. Review of Geographical Coordinates The Earth’s spin determines special locations on Earth. The spin axis goes through the North and South Poles, and midway betwe ...
The Project Gutenberg eBook #32000: An
... the coördinate systems is indispensable, but they always present some difficulties when they are encountered at the beginning of the subject. It is believed that the present treatment prepares so thoroughly for their study and leads so naturally to them that their mastery will not be found difficult ...
... the coördinate systems is indispensable, but they always present some difficulties when they are encountered at the beginning of the subject. It is believed that the present treatment prepares so thoroughly for their study and leads so naturally to them that their mastery will not be found difficult ...
The chemical composition of solar-type stars and its impact on the
... a roundup of the achievements in this field and a theoretical outlook on the next years, see, e.g., S. Seager (2011, [153]). Planet search is usually conducted using two different methods, the radial velocity method and the transit one. In the radial velocity method, displacements of a star’s spectr ...
... a roundup of the achievements in this field and a theoretical outlook on the next years, see, e.g., S. Seager (2011, [153]). Planet search is usually conducted using two different methods, the radial velocity method and the transit one. In the radial velocity method, displacements of a star’s spectr ...
4373 - Zuber, M. T., H. Y. McSween Jr., R. P. Binzel, L. T. Elkins
... to be consistent with chondrites, but could not constrain the metal content. The composition of the silicate portion (mantle + crust) of Vesta was estimated (Jones 1984) based on mineral-melt partitioning of Mg, Si, and Sc. This bulk silicate composition was equivalent to 75% olivine plus 25% eucrit ...
... to be consistent with chondrites, but could not constrain the metal content. The composition of the silicate portion (mantle + crust) of Vesta was estimated (Jones 1984) based on mineral-melt partitioning of Mg, Si, and Sc. This bulk silicate composition was equivalent to 75% olivine plus 25% eucrit ...
low-res - Communicating Astronomy with the Public Journal
... Experiments around the world are trying to detect and study dark matter particles in more direct ways. Facilities like the Large Hadron Collider could create dark matter particles. ...
... Experiments around the world are trying to detect and study dark matter particles in more direct ways. Facilities like the Large Hadron Collider could create dark matter particles. ...
PDF 523 KB
... Percival Lowell died before PLuto was discovered. In spite of the fact that he himself did not discover the planet, he prepared the groundwork for the discovery. His observatory in Flagstaff Arizona, was ready for the discovery with its new refractor and photographic technique of observations. Clyde ...
... Percival Lowell died before PLuto was discovered. In spite of the fact that he himself did not discover the planet, he prepared the groundwork for the discovery. His observatory in Flagstaff Arizona, was ready for the discovery with its new refractor and photographic technique of observations. Clyde ...
Exam Review
... 3. Draw a diagram to show why the seasons change in the Northern Hemisphere. Label the Sun, and draw the position of Earth four times on the diagram to show its location and the season at that time. Use an arrow to show the direction of Earth’s orbit around the Sun. 4. Describe what causes the phase ...
... 3. Draw a diagram to show why the seasons change in the Northern Hemisphere. Label the Sun, and draw the position of Earth four times on the diagram to show its location and the season at that time. Use an arrow to show the direction of Earth’s orbit around the Sun. 4. Describe what causes the phase ...
January 2014 Astronomy Calendar by Dave Mitsky Some
... are available at http://www.lunar-occultations.com/rlo/rays/rays.htm The Sun is located in Sagittarius on January 1st. Data (magnitude, apparent size, illumination, and distance from the Earth in astronomical units) for the planets and Pluto on January 1: Mercury (-1.3, 4.7", 100%, 1.43 a.u., Sagitt ...
... are available at http://www.lunar-occultations.com/rlo/rays/rays.htm The Sun is located in Sagittarius on January 1st. Data (magnitude, apparent size, illumination, and distance from the Earth in astronomical units) for the planets and Pluto on January 1: Mercury (-1.3, 4.7", 100%, 1.43 a.u., Sagitt ...
The Project Gutenberg eBook #31344: Mathematical Geography
... attraction which is used to hold the object in the circular course. The excess is what we call the weight of the body or the force of gravity. If, therefore, a spring balance suspending a body at the equator shows 288 pounds, we infer that the earth really pulls it with a force of 289 pounds, but on ...
... attraction which is used to hold the object in the circular course. The excess is what we call the weight of the body or the force of gravity. If, therefore, a spring balance suspending a body at the equator shows 288 pounds, we infer that the earth really pulls it with a force of 289 pounds, but on ...
Extraterrestrial life
Extraterrestrial life is life that does not originate from Earth. It is also called alien life, or, if it is a sentient and/or relatively complex individual, an ""extraterrestrial"" or ""alien"" (or, to avoid confusion with the legal sense of ""alien"", a ""space alien""). These as-yet-hypothetical life forms range from simple bacteria-like organisms to beings with civilizations far more advanced than humanity. Although many scientists expect extraterrestrial life to exist, so far no unambiguous evidence for its existence exists.The science of extraterrestrial life is known as exobiology. The science of astrobiology also considers life on Earth as well, and in the broader astronomical context. Meteorites that have fallen to Earth have sometimes been examined for signs of microscopic extraterrestrial life. Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial intelligence, from radios used to detect possible extraterrestrial signals, to telescopes used to search for potentially habitable extrasolar planets. It has also played a major role in works of science fiction. Over the years, science fiction works, especially Hollywood's involvement, has increased the public's interest in the possibility of extraterrestrial life. Some encourage aggressive methods to try to get in contact with life in outer space, whereas others argue that it might be dangerous to actively call attention to Earth.