The Solar System and Beyond
... The change in the public’s perception of the World has been matched by advances in our scientific understanding of the Universe, of the origin and evolution of the Solar System with the Sun, the planets, moons and comets, and last but not least of the Earth, including its environment and near-Earth ...
... The change in the public’s perception of the World has been matched by advances in our scientific understanding of the Universe, of the origin and evolution of the Solar System with the Sun, the planets, moons and comets, and last but not least of the Earth, including its environment and near-Earth ...
The physics of star formation
... of their high opacity, the rate at which they are heated by external radiation is low; the result is that molecular clouds are very cold and have typical temperatures of only about 10–20 K. Higher temperatures of up to 100 K or more may exist locally in regions heated by luminous newly formed stars. ...
... of their high opacity, the rate at which they are heated by external radiation is low; the result is that molecular clouds are very cold and have typical temperatures of only about 10–20 K. Higher temperatures of up to 100 K or more may exist locally in regions heated by luminous newly formed stars. ...
teach with space
... orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar System known as the Oort Cloud. Reaching out to a distance of many thousands of astronomical units (AU)*, ...
... orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar System known as the Oort Cloud. Reaching out to a distance of many thousands of astronomical units (AU)*, ...
UvA-DARE (Digital Academic Repository)
... The intermediate regime: Growth of dust grains is most difficult to understand in the regime where grains are too large to grow by coagulation (Blum & Wurm 2008), but too small to grow by gravitational interaction. In addition, should particles reach one meter in size, they would feel a strong headw ...
... The intermediate regime: Growth of dust grains is most difficult to understand in the regime where grains are too large to grow by coagulation (Blum & Wurm 2008), but too small to grow by gravitational interaction. In addition, should particles reach one meter in size, they would feel a strong headw ...
ABSTRACT
... In stable solar systems, planets remain in nearly elliptical orbits around their stars. Over longer timescales, however, their orbital shapes and sizes change due to mutual gravitational perturbations. Orbits of satellites around a planet vary for the same reason. Because of their interactions, the ...
... In stable solar systems, planets remain in nearly elliptical orbits around their stars. Over longer timescales, however, their orbital shapes and sizes change due to mutual gravitational perturbations. Orbits of satellites around a planet vary for the same reason. Because of their interactions, the ...
Rocky planetesimals as the origin of metals in DZ stars
... Farihi & Zuckerman 2009a). Thus, while there is firm observational evidence of pollution via circumstellar material, as yet there is none favouring the ISM. Aannestad et al. (1993) provided an extensive spatial, kinematical and calcium abundance analysis against which they tested likely scenarios of ...
... Farihi & Zuckerman 2009a). Thus, while there is firm observational evidence of pollution via circumstellar material, as yet there is none favouring the ISM. Aannestad et al. (1993) provided an extensive spatial, kinematical and calcium abundance analysis against which they tested likely scenarios of ...
Barium and europium abundances in cool dwarf stars and
... halo stars are of the r-process origin. Much observational efforts were invested in testing this idea. For extremely metalpoor stars with metallicities [Fe/H] ≤ −2.4 McWilliam (1998) has derived an average [Eu/Ba] = 0.69, consistent with pure rprocess nucleosynthesis provided that the data of Arland ...
... halo stars are of the r-process origin. Much observational efforts were invested in testing this idea. For extremely metalpoor stars with metallicities [Fe/H] ≤ −2.4 McWilliam (1998) has derived an average [Eu/Ba] = 0.69, consistent with pure rprocess nucleosynthesis provided that the data of Arland ...
The physics of star formation - Yale Astronomy
... runaway growth of a central density peak that evolves towards a singularity. As long as collapse can occur, rotation and magnetic fields do not change this qualitative behaviour. The result is that a very small embryonic star or protostar forms and grows by accretion at a rate that is initially high ...
... runaway growth of a central density peak that evolves towards a singularity. As long as collapse can occur, rotation and magnetic fields do not change this qualitative behaviour. The result is that a very small embryonic star or protostar forms and grows by accretion at a rate that is initially high ...
The physics of star formation
... runaway growth of a central density peak that evolves towards a singularity. As long as collapse can occur, rotation and magnetic fields do not change this qualitative behaviour. The result is that a very small embryonic star or protostar forms and grows by accretion at a rate that is initially high ...
... runaway growth of a central density peak that evolves towards a singularity. As long as collapse can occur, rotation and magnetic fields do not change this qualitative behaviour. The result is that a very small embryonic star or protostar forms and grows by accretion at a rate that is initially high ...
The Celestial Sphere CHAPTER 1
... Figure S2.2: Results for Problem 2.16. 2.17 (Note: Orbit can be downloaded from the companion web site at http://www.aw-bc.com/astrophysics.) (a) See Fig. S2.3. (b) See Fig. S2.3. (c) Figure S2.3 shows that the orbit of Mars is very close to a perfect circle, with the center of the circle slightly o ...
... Figure S2.2: Results for Problem 2.16. 2.17 (Note: Orbit can be downloaded from the companion web site at http://www.aw-bc.com/astrophysics.) (a) See Fig. S2.3. (b) See Fig. S2.3. (c) Figure S2.3 shows that the orbit of Mars is very close to a perfect circle, with the center of the circle slightly o ...
Asteroids in the inner Solar system II. Observable
... ground-based surveys like the Sloan Digital Sky Survey (SDSS2) will also be useful for objects exterior to the Earth's orbit. Motivated by these observational opportunities, this paper presents the observable properties of numerically long-lived clouds of asteroids orbiting about the Lagrange points ...
... ground-based surveys like the Sloan Digital Sky Survey (SDSS2) will also be useful for objects exterior to the Earth's orbit. Motivated by these observational opportunities, this paper presents the observable properties of numerically long-lived clouds of asteroids orbiting about the Lagrange points ...
teach with space
... orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar System known as the Oort Cloud. Reaching out to a distance of many thousands of astronomical units (AU)*, ...
... orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar System known as the Oort Cloud. Reaching out to a distance of many thousands of astronomical units (AU)*, ...
PHY216_lect3_2014_sub
... Universal Time is the name by which Greenwich Mean Time (GMT) became known for scientific purposes in 1928. UT is based on the daily rotation of the Earth. However, the Earth’s rotation is somewhat irregular and can therefore no longer be used as a precise system of time. Versions of UT: UT1: • The ...
... Universal Time is the name by which Greenwich Mean Time (GMT) became known for scientific purposes in 1928. UT is based on the daily rotation of the Earth. However, the Earth’s rotation is somewhat irregular and can therefore no longer be used as a precise system of time. Versions of UT: UT1: • The ...
Determination of accurate stellar radial
... to be inevitable unless the object and template spectra are almost identical, i.e. resulting from the same source, or at least the same stellar type, and recorded with the same instrument. For instance, it is generally recognised that the use of a single template for different spectral types is like ...
... to be inevitable unless the object and template spectra are almost identical, i.e. resulting from the same source, or at least the same stellar type, and recorded with the same instrument. For instance, it is generally recognised that the use of a single template for different spectral types is like ...
Migrating Dust Particles
... pebbles; pebbles collided with pebbles, to create even bigger bodies. As the pebbles grew in size they drifted towards the Sun. This material was later accreted to planetesimals which are held together by self-gravity. As the planetesimals extend their gravitational range they have a run-away growth ...
... pebbles; pebbles collided with pebbles, to create even bigger bodies. As the pebbles grew in size they drifted towards the Sun. This material was later accreted to planetesimals which are held together by self-gravity. As the planetesimals extend their gravitational range they have a run-away growth ...
CHAPTER 1 The Formation and Structure of Stars
... • Nuclear fusion at the centers of stars heats their interiors, creates high gas pressures, and thus balances the inward forces of gravity. – If an increase or decrease in temperature produces a corresponding change in pressure, then the thermostat is functioning correctly— and the star is stable. ...
... • Nuclear fusion at the centers of stars heats their interiors, creates high gas pressures, and thus balances the inward forces of gravity. – If an increase or decrease in temperature produces a corresponding change in pressure, then the thermostat is functioning correctly— and the star is stable. ...
About the Instructor`s Guide
... software with informative tutorials. Here are just a few of the exciting things your students can do with this powerful tool: ...
... software with informative tutorials. Here are just a few of the exciting things your students can do with this powerful tool: ...
The astrobiological case for our cosmic ancestry
... molecules, infrared spectra of dust arises from several different functional groups, and the challenge for astronomers is to identify a plausible ensemble of molecules consistent with such spectra. We tested a range of possibilities for the organic composition of dust and eventually felt justified to ...
... molecules, infrared spectra of dust arises from several different functional groups, and the challenge for astronomers is to identify a plausible ensemble of molecules consistent with such spectra. We tested a range of possibilities for the organic composition of dust and eventually felt justified to ...
- TestbankU
... c. provide a common language for all scientists. d. serve as a qualitative description of nature. e. all of the above. Ans: c 2. Which of the following, according to your text, is an attribute of a “useful” ...
... c. provide a common language for all scientists. d. serve as a qualitative description of nature. e. all of the above. Ans: c 2. Which of the following, according to your text, is an attribute of a “useful” ...
The Habitability of Proxima Centauri b I: Evolutionary Scenarios
... planet, as suggested by the discovery data, then it may perturb planet b’s eccentricity and inclination, possibly driving those parameters to non-zero values, even in the presence of strong tidal damping. We also model the internal evolution of the planet, evaluating the roles of different radiogeni ...
... planet, as suggested by the discovery data, then it may perturb planet b’s eccentricity and inclination, possibly driving those parameters to non-zero values, even in the presence of strong tidal damping. We also model the internal evolution of the planet, evaluating the roles of different radiogeni ...
Night Sky III Planetary Motion Lunar Phases Astronomy 1 — Elementary Astronomy
... Suppose it is early in the month and you are going on a cruise to view a total solar eclipse later the same month. The moon is currently full. If it only takes a day or so to get to the viewing location, about when might your cruise depart? ...
... Suppose it is early in the month and you are going on a cruise to view a total solar eclipse later the same month. The moon is currently full. If it only takes a day or so to get to the viewing location, about when might your cruise depart? ...
the evolution of planetary systems with time
... Solar systems orbiting other stars display a diverse set of architectures and motivate further studies concerning the dynamics of planetary systems. Part of the richness of this dynamical problem arises from the intrinsic complexity of N-body systems, even in the absence of additional forces (Murray ...
... Solar systems orbiting other stars display a diverse set of architectures and motivate further studies concerning the dynamics of planetary systems. Part of the richness of this dynamical problem arises from the intrinsic complexity of N-body systems, even in the absence of additional forces (Murray ...
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.