Comet Facts, Myths, and Legends
... (pronounced "hyah-koo-tah-kay"), an amateur astronomer from southern Japan, discovered a new comet using a pair of binoculars. In the spring of that year, this small bright comet with a nucleus of 1.6 to 3.2 km (1 to 2 miles) made a close flyby of Earth — sporting one of the longest tails ever obser ...
... (pronounced "hyah-koo-tah-kay"), an amateur astronomer from southern Japan, discovered a new comet using a pair of binoculars. In the spring of that year, this small bright comet with a nucleus of 1.6 to 3.2 km (1 to 2 miles) made a close flyby of Earth — sporting one of the longest tails ever obser ...
The Gould Belt
... The papers of Lindblad [13,14] and Oort [15,16] have had a significant influence on studies of the structure and kinematics of the Galaxy. The existence of interstellar absorption of light was definitively established [17] and many authors contributed to developing models of stellar evolution; O and T ...
... The papers of Lindblad [13,14] and Oort [15,16] have had a significant influence on studies of the structure and kinematics of the Galaxy. The existence of interstellar absorption of light was definitively established [17] and many authors contributed to developing models of stellar evolution; O and T ...
PDF
... BUT: requires 3000 times normal halo DM density in GCs and very optimistic capture rate. If true, then only one small window left below MACHO/EROS microlensing limits ...
... BUT: requires 3000 times normal halo DM density in GCs and very optimistic capture rate. If true, then only one small window left below MACHO/EROS microlensing limits ...
Asteroids - GEOCITIES.ws
... In 1772 the French mathematician and astronomer Joseph-Louis Lagrange predicted the existence and location of two groups of asteroids located near the (L4 and L5) equilateral triangular stability points of a three-body system formed by the Sun, Jupiter, and the asteroids. These are two of the five s ...
... In 1772 the French mathematician and astronomer Joseph-Louis Lagrange predicted the existence and location of two groups of asteroids located near the (L4 and L5) equilateral triangular stability points of a three-body system formed by the Sun, Jupiter, and the asteroids. These are two of the five s ...
Downloadable Full Text
... invoked to aid in chemical evolution models4, but even combining these with the minimum possible dilution mass results in [Eu/H] values too low to match the stellar abundances in Ret II. Though several candidates exist for rare and prolific r-process sites, neutron star mergers are considered one of ...
... invoked to aid in chemical evolution models4, but even combining these with the minimum possible dilution mass results in [Eu/H] values too low to match the stellar abundances in Ret II. Though several candidates exist for rare and prolific r-process sites, neutron star mergers are considered one of ...
All About Elements
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
Helium - Boreal Science
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
Earth impact probability of the Asteroid (25143)
... planet-crossing orbits are also sensitive to the assumed physical model of the Solar System, to the integration algorithm and to the round-off features of the computer. Small changes to any of these options imply that beyond a few time tL , the computed orbits completely “loose memory” of their comm ...
... planet-crossing orbits are also sensitive to the assumed physical model of the Solar System, to the integration algorithm and to the round-off features of the computer. Small changes to any of these options imply that beyond a few time tL , the computed orbits completely “loose memory” of their comm ...
THE PRIMORDIAL HELIUM ABUNDANCE Manuel Peimbert
... of the pillars of Big Bang cosmology and an accurate determination of YP permits to test the Standard Big Bang Nucleosynthesis (SBBN), (b) the models of stellar evolution require an accurate initial Y value; this is given by YP plus the additional Y produced by galactic chemical evolution, which can ...
... of the pillars of Big Bang cosmology and an accurate determination of YP permits to test the Standard Big Bang Nucleosynthesis (SBBN), (b) the models of stellar evolution require an accurate initial Y value; this is given by YP plus the additional Y produced by galactic chemical evolution, which can ...
pluto and the platypus - facstaff.bucknell.edu
... As astronomers learned more about Pluto, however, confidence that Tombaugh had found Lowell’s Planet X waned. We learned that Pluto’s brightness was due in large part to its high albedo rather than size (originally estimated to be in the neighborhood of Earth; an estimate off by several orders of ma ...
... As astronomers learned more about Pluto, however, confidence that Tombaugh had found Lowell’s Planet X waned. We learned that Pluto’s brightness was due in large part to its high albedo rather than size (originally estimated to be in the neighborhood of Earth; an estimate off by several orders of ma ...
comets
... that a bright comet which appeared in 1682, could be on the same elliptical orbit as that followed by comets in 1378, 1465, 1531 and 1607 [1]. Although that orbital periods were not the same, it was discovered that comet changed its orbit slightly when (and only when) it passed close to one of the g ...
... that a bright comet which appeared in 1682, could be on the same elliptical orbit as that followed by comets in 1378, 1465, 1531 and 1607 [1]. Although that orbital periods were not the same, it was discovered that comet changed its orbit slightly when (and only when) it passed close to one of the g ...
Superstars of Astronomy: Debra Fischer transcript
... when I was in college. It was sort of unsettling. I remember feeling how insignificant it seemed that the Earth was in the context of the entire, well, galaxy and then the entire universe beyond that. So the scope of things was almost dizzying and, as I said, unsettling to me. Then I remember the se ...
... when I was in college. It was sort of unsettling. I remember feeling how insignificant it seemed that the Earth was in the context of the entire, well, galaxy and then the entire universe beyond that. So the scope of things was almost dizzying and, as I said, unsettling to me. Then I remember the se ...
Live from McDonald Observatory: Observing Venus: explore how it
... In the box, students should draw Venus exactly as they see it on their screen. Depending on the location of Venus in its orbit around the sun on the day of your videoconference, students might ...
... In the box, students should draw Venus exactly as they see it on their screen. Depending on the location of Venus in its orbit around the sun on the day of your videoconference, students might ...
NAS biographical memoir of Martin Schwarzschild
... Nature and nurture conspired to provide an ideal scientific environment for Martin Schwarzschild, but the early years must have been difficult. He was born to a distinguished and assimilated German-Jewish family in 1912—two years before the outbreak of World War I—when his father, Karl Schwarzschild ...
... Nature and nurture conspired to provide an ideal scientific environment for Martin Schwarzschild, but the early years must have been difficult. He was born to a distinguished and assimilated German-Jewish family in 1912—two years before the outbreak of World War I—when his father, Karl Schwarzschild ...
Solar System Moon Phases /Galactic Address
... All the stars we see with our naked eye are within our own Milky Way Galaxy. Our closest star, The Sun, is about 92,000,000 (92 million) miles from Earth. The Sun is just one of at least 100,000,000,000 (100 Billion) stars just within the Milky Way. Scientists now estimate there may be 10-40 Billion ...
... All the stars we see with our naked eye are within our own Milky Way Galaxy. Our closest star, The Sun, is about 92,000,000 (92 million) miles from Earth. The Sun is just one of at least 100,000,000,000 (100 Billion) stars just within the Milky Way. Scientists now estimate there may be 10-40 Billion ...
orbital resonances and chaos in the solar system
... plane of the orbit has inclination i with respect to the fixed reference plane, and intersects the latter along the line of nodes, NN 0 , where ON defines the ascending node. The long axis of the ellipse is along P P 0 , where OP defines the perihelion (or periapse); the argument of perihelion ω is ...
... plane of the orbit has inclination i with respect to the fixed reference plane, and intersects the latter along the line of nodes, NN 0 , where ON defines the ascending node. The long axis of the ellipse is along P P 0 , where OP defines the perihelion (or periapse); the argument of perihelion ω is ...
Preprint - Lunar and Planetary Laboratory
... Jupiter. Jupiter essentially controls the overall dynamics because it is very effective at ejecting planetesimals from the solar system. Planetesimals scattered inward by Neptune and subsequently ...
... Jupiter. Jupiter essentially controls the overall dynamics because it is very effective at ejecting planetesimals from the solar system. Planetesimals scattered inward by Neptune and subsequently ...
Sidereus Nuncius (Print Translation)
... I shall first mention briefly, and then I shall review the history of the observations made by me. About ten months ago a rumor came to our ears that a spyglass had been made by a certain Dutchman23 by means of which visible objects, although far removed from the eye of the observer, were distinctl ...
... I shall first mention briefly, and then I shall review the history of the observations made by me. About ten months ago a rumor came to our ears that a spyglass had been made by a certain Dutchman23 by means of which visible objects, although far removed from the eye of the observer, were distinctl ...
Galaxies
... 5. Limitations of the model There are several limitations of our computer model. First, it is only a two-dimensional demonstration of the galactic collision, but actually, the stars in the galaxies do not completely lie on the same plane. As a result, the model does not consider the 3-D component of ...
... 5. Limitations of the model There are several limitations of our computer model. First, it is only a two-dimensional demonstration of the galactic collision, but actually, the stars in the galaxies do not completely lie on the same plane. As a result, the model does not consider the 3-D component of ...
PPT
... depends on organic (carbonbased) molecules • These molecules occur naturally throughout interstellar space • The organic molecules needed for life to originate were probably brought to the young Earth by comets or meteorites ...
... depends on organic (carbonbased) molecules • These molecules occur naturally throughout interstellar space • The organic molecules needed for life to originate were probably brought to the young Earth by comets or meteorites ...
Eclipses Old Dead Guys Part I Astronomy 1 — Elementary Astronomy
... at right obeys Kepler’s Laws. Use this drawing to answer the next four questions. 1) According to Kepler’s Second Law, during which one of the portion of the planet’s orbit (B, C, or D), would the planet take the same amount of time as it took for the portion of the orbit identified with letter “A”? ...
... at right obeys Kepler’s Laws. Use this drawing to answer the next four questions. 1) According to Kepler’s Second Law, during which one of the portion of the planet’s orbit (B, C, or D), would the planet take the same amount of time as it took for the portion of the orbit identified with letter “A”? ...
Astro 102 Practice Test 3
... ____ 43. The sun makes most of its energy by the CNO cycle. ____ 44. Helium fusion does not begin until the star has entered the giant region of the H-R diagram. ____ 45. Even in degenerate matter, pressure depends on temperature. ____ 46. Young star clusters have bluer turn-off points than old clus ...
... ____ 43. The sun makes most of its energy by the CNO cycle. ____ 44. Helium fusion does not begin until the star has entered the giant region of the H-R diagram. ____ 45. Even in degenerate matter, pressure depends on temperature. ____ 46. Young star clusters have bluer turn-off points than old clus ...
Formation and evolution of the Solar System
The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.