![PYTS/ASTR 206 – Comets](http://s1.studyres.com/store/data/002742677_1-cf85c822895b4d31f017203143583116-300x300.png)
PYTS/ASTR 206 – Comets
... Have very long periods/large orbits Many of these appear to be on their first pass through the inner solar system ...
... Have very long periods/large orbits Many of these appear to be on their first pass through the inner solar system ...
Jupiter`s Outer Satellites and Trojans
... continuing source of the long-period comets. Planetesimals growing beyond Neptune were relatively undisturbed and their descendants survive today in the Kuiper Belt . The Kuiper Belt in turn feeds the giant-planet crossing Centaurs , which are then converted by planetary (largely Jovian) perturbatio ...
... continuing source of the long-period comets. Planetesimals growing beyond Neptune were relatively undisturbed and their descendants survive today in the Kuiper Belt . The Kuiper Belt in turn feeds the giant-planet crossing Centaurs , which are then converted by planetary (largely Jovian) perturbatio ...
WELCOME TO THE MILKY WAY
... are said to have a higher metallicity than Population II stars. In astronomy, all elements heavier than helium are called metals. The metallicity is a measure of the age of a star. In the early evolution of the Milky Way, the interstellar medium was thought to be low on metals. Stars formed at that ...
... are said to have a higher metallicity than Population II stars. In astronomy, all elements heavier than helium are called metals. The metallicity is a measure of the age of a star. In the early evolution of the Milky Way, the interstellar medium was thought to be low on metals. Stars formed at that ...
The surface composition of Beta Pictoris
... matter is accumulating (e.g. Stürenburg 1993; HRH95; Hauck et al. 1995; Grady et al. 1996). In view of this the absence of surface anomalies in a star like β Pic—with its spectacular disk of gas and dust—is puzzling. A possible explanation is that accretion does not occur at all, or at a rate which ...
... matter is accumulating (e.g. Stürenburg 1993; HRH95; Hauck et al. 1995; Grady et al. 1996). In view of this the absence of surface anomalies in a star like β Pic—with its spectacular disk of gas and dust—is puzzling. A possible explanation is that accretion does not occur at all, or at a rate which ...
Summer 2014 Mercury - Astronomical Society of the Pacific
... even years ago in this column (“Who Discovered Jupiter’s Satellites?” Spring, 2007), I mentioned that Simon Marius (15731624) was a close rival to Galileo when it came to finding the four large satellites of Jupiter. As the court mathematician in Ansbach (part of Bavaria since 1806), Marius began ma ...
... even years ago in this column (“Who Discovered Jupiter’s Satellites?” Spring, 2007), I mentioned that Simon Marius (15731624) was a close rival to Galileo when it came to finding the four large satellites of Jupiter. As the court mathematician in Ansbach (part of Bavaria since 1806), Marius began ma ...
The Cosmic Perspective Our Galaxy
... dark matter lies within the Sun's orbit. a) True, the Sun's motion in the galaxy shows that we are near the edge of the Milky Way disk and therefore exterior to most of the mass of the galaxy. b) True, the Milky Way's rotation curve stops increasing well before the orbit of the Sun, indicating tha ...
... dark matter lies within the Sun's orbit. a) True, the Sun's motion in the galaxy shows that we are near the edge of the Milky Way disk and therefore exterior to most of the mass of the galaxy. b) True, the Milky Way's rotation curve stops increasing well before the orbit of the Sun, indicating tha ...
Star Formation in the Local Milky Way
... predictive theory of star formation. These conditions would include the masses, sizes, temperatures, densities, pressures, kinematics, and compositions of dense cores, particularly starless ones. Studies of nearby ( < 150 pc) local clouds have provided a wealth of information concerning these cores ...
... predictive theory of star formation. These conditions would include the masses, sizes, temperatures, densities, pressures, kinematics, and compositions of dense cores, particularly starless ones. Studies of nearby ( < 150 pc) local clouds have provided a wealth of information concerning these cores ...
NAME ..........................................................................CLASS.............ADM
... b) The earth surface is made up of land __________ % and water _________. It is about ___________ million km from the sun and it as old as______________ million years. It receives energy in form of radiation from a start known as the sun. The sun is made up of two main gases name ___________________ ...
... b) The earth surface is made up of land __________ % and water _________. It is about ___________ million km from the sun and it as old as______________ million years. It receives energy in form of radiation from a start known as the sun. The sun is made up of two main gases name ___________________ ...
10 Astrophysics (Option E)
... in fact, the planets have slightly elliptical orbits. An ellipse is a flattened circle with two centres; one of these centres is the Sun. We know that for a satellite to have a circular orbit at a given radius, it must have a very specific velocity. If it goes faster, its orbit will be elliptical or ...
... in fact, the planets have slightly elliptical orbits. An ellipse is a flattened circle with two centres; one of these centres is the Sun. We know that for a satellite to have a circular orbit at a given radius, it must have a very specific velocity. If it goes faster, its orbit will be elliptical or ...
PPS
... Stars form when cool, relatively dense clouds of gas and dust in space shrink in upon themselves as a result of gravitational collapse. This mainly happens in giant molecular clouds, where the density is about 1 billion or 10 billion atoms per cubic metre. It is actually very difficult to make a clo ...
... Stars form when cool, relatively dense clouds of gas and dust in space shrink in upon themselves as a result of gravitational collapse. This mainly happens in giant molecular clouds, where the density is about 1 billion or 10 billion atoms per cubic metre. It is actually very difficult to make a clo ...
Lecture 2 Understand the sky we see from the Earth
... Why did the ancient Greeks reject the notion that the Earth orbits the sun? • It ran contrary to their senses. • If the Earth rotated, then there should be a “great wind” as we moved through the air. • Greeks knew that we should see stellar parallax if we orbited the Sun – but they could not detect ...
... Why did the ancient Greeks reject the notion that the Earth orbits the sun? • It ran contrary to their senses. • If the Earth rotated, then there should be a “great wind” as we moved through the air. • Greeks knew that we should see stellar parallax if we orbited the Sun – but they could not detect ...
PLUTO - science1d
... Pluto is the ________________________ and usually the ________________________ planet (a dwarf planet) from the Sun in our Solar System; it is also the smallest planet in our Solar System. This cold, rocky planet was the last planet to be discovered (Pluto was considered to be a planet from its disc ...
... Pluto is the ________________________ and usually the ________________________ planet (a dwarf planet) from the Sun in our Solar System; it is also the smallest planet in our Solar System. This cold, rocky planet was the last planet to be discovered (Pluto was considered to be a planet from its disc ...
CELESTIAL COORDINATES
... For every month since the last fall equinox, sidereal time gains 2 hours over solar time. We simply count the number of elapsed months, multiply by 2, and add the time to our watch (converting to a 24-hour system as needed). If daylight savings time is in effect, we subtract 1 hour from the result t ...
... For every month since the last fall equinox, sidereal time gains 2 hours over solar time. We simply count the number of elapsed months, multiply by 2, and add the time to our watch (converting to a 24-hour system as needed). If daylight savings time is in effect, we subtract 1 hour from the result t ...
Neon and oxygen in low activity stars: towards a coronal unification
... has no strong photospheric lines and its abundance is determined from emission lines originating in the transition region and the corona or through composition measurements of solar wind particles. However, both methods do not necessarily trace the true solar photospheric abundances, since chemical ...
... has no strong photospheric lines and its abundance is determined from emission lines originating in the transition region and the corona or through composition measurements of solar wind particles. However, both methods do not necessarily trace the true solar photospheric abundances, since chemical ...
EX PLANET E - Institute of Physics
... called the Goldilocks zone as it is neither too hot, nor too cold for life to evolve as we know it. You could explain how astronomers are able to estimate the size of a star’s habitable zone. Refer students to the planetary temperatures on the instruction sheet, both predicted and actual. Explain th ...
... called the Goldilocks zone as it is neither too hot, nor too cold for life to evolve as we know it. You could explain how astronomers are able to estimate the size of a star’s habitable zone. Refer students to the planetary temperatures on the instruction sheet, both predicted and actual. Explain th ...
Why is the Sun very dense on the inside?
... a) Yes, because Earth would quickly freeze over. b) Yes, because Earth would no longer be bound to the solar system and would drift into space. c) Yes, because the Sun would collapse and the planets would soon follow. d) No, it takes thousands of years for photons created in nuclear reactions at ...
... a) Yes, because Earth would quickly freeze over. b) Yes, because Earth would no longer be bound to the solar system and would drift into space. c) Yes, because the Sun would collapse and the planets would soon follow. d) No, it takes thousands of years for photons created in nuclear reactions at ...
Dynamics of small bodies in planetary systems
... can be estimated as long as the level of dust emission has been measured at two or more wavelengths from which its temperature can be estimated. However, such estimates suffer large uncertainties, since the exact temperature of the dust depends on its size and composition (see chapter by Li). Assumi ...
... can be estimated as long as the level of dust emission has been measured at two or more wavelengths from which its temperature can be estimated. However, such estimates suffer large uncertainties, since the exact temperature of the dust depends on its size and composition (see chapter by Li). Assumi ...
Physical structure of the local interstellar medium
... Center direction, called the Galactic (G) Cloud. A threedimensional model of the LIC indicates that the G Cloud is less than 0.2 pc away (Redfield and Linsky, 2000). Our current knowledge of the G Cloud, the cloud that will surround the Sun and our solar system in less than 7000 years, is limited to ...
... Center direction, called the Galactic (G) Cloud. A threedimensional model of the LIC indicates that the G Cloud is less than 0.2 pc away (Redfield and Linsky, 2000). Our current knowledge of the G Cloud, the cloud that will surround the Sun and our solar system in less than 7000 years, is limited to ...
D ASTROPHYSICS
... Six of the planets have moons orbiting them: Mars has two moons, while Jupiter has at least 50 acknowledged moons with several provisional ones that might be asteroids captured by its gravitational field. About 4.5 billion years ago, the Earth’s moon is believed to have been formed from material eje ...
... Six of the planets have moons orbiting them: Mars has two moons, while Jupiter has at least 50 acknowledged moons with several provisional ones that might be asteroids captured by its gravitational field. About 4.5 billion years ago, the Earth’s moon is believed to have been formed from material eje ...
Comparison of low- and high-mass star formation
... this late phase only because of an even larger global collapse rate. A common theme of the early and late phases of rapid accretion is that the dense gas that feeds the most massive object at a high rate is gathered by an agent external to the object. It is the converging flow set up by the initial ...
... this late phase only because of an even larger global collapse rate. A common theme of the early and late phases of rapid accretion is that the dense gas that feeds the most massive object at a high rate is gathered by an agent external to the object. It is the converging flow set up by the initial ...
dark matter - University of Texas Astronomy Home Page
... the center and less on the outskirts. Based on this information, where do you expect most of the mass to be located in a galaxy? 2. At right is a picture of a spiral galaxy similar to the Milky Way. The orbits of three stars are labeled. Star A is on the edge of the bulge. The Sun’s orbit is marked ...
... the center and less on the outskirts. Based on this information, where do you expect most of the mass to be located in a galaxy? 2. At right is a picture of a spiral galaxy similar to the Milky Way. The orbits of three stars are labeled. Star A is on the edge of the bulge. The Sun’s orbit is marked ...
Formation and evolution of the Solar System
![](https://commons.wikimedia.org/wiki/Special:FilePath/Protoplanetary-disk.jpg?width=300)
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.