Stars in our Galaxy
... amount of light it gives off • Apparent magnitude is a measure of the amount of light received on Earth • A star that is dim can appear bright if it is close to Earth, and a start that’s bright can appear dim if its far away. • If two stars are the same distance away, what might cause one of them to ...
... amount of light it gives off • Apparent magnitude is a measure of the amount of light received on Earth • A star that is dim can appear bright if it is close to Earth, and a start that’s bright can appear dim if its far away. • If two stars are the same distance away, what might cause one of them to ...
Young Stars in AGN
... All the UV to near-IR continuum light in at least some Sey 2, all the ones observed with HST so far, is due to a nuclear starburst (SB), which is resolved in UV. In the very luminous Sey2 Mk477, seen as a Sey1 in polarized light, the nuclear SB is at least as luminous as the Sey1 component. Other Se ...
... All the UV to near-IR continuum light in at least some Sey 2, all the ones observed with HST so far, is due to a nuclear starburst (SB), which is resolved in UV. In the very luminous Sey2 Mk477, seen as a Sey1 in polarized light, the nuclear SB is at least as luminous as the Sey1 component. Other Se ...
Sample Exam for 3 rd Astro Exam
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
Telescope Quick Start Guide
... F ratio of 6 is denoted as “f/6” by tradition F ratio is proportional to focus imaged size Large F ratio -> bigger, fainter image Small F ratio -> smaller, brighter image F ratio is inversely proportional to “speed” of telescope where speed is brightness per pixel per second at focal plane Large F r ...
... F ratio of 6 is denoted as “f/6” by tradition F ratio is proportional to focus imaged size Large F ratio -> bigger, fainter image Small F ratio -> smaller, brighter image F ratio is inversely proportional to “speed” of telescope where speed is brightness per pixel per second at focal plane Large F r ...
The Milky Way
... • How do we know the distance to stars and clusters in our galaxy? • Stellar parallax: – Parallax of nearby stars relative to background stars. – Good out to ~500 pc. ...
... • How do we know the distance to stars and clusters in our galaxy? • Stellar parallax: – Parallax of nearby stars relative to background stars. – Good out to ~500 pc. ...
The cosmological distance ladder
... the distances to globular clusters in our Galaxy. This allowed him to determine the distance to the center of the Galaxy. In 1924 Edwin Hubble used Cepheids to show that the Andromeda Nebula is very much like our Milky Way Galaxy. Both are large ensembles of a couple hundred billion stars. And the A ...
... the distances to globular clusters in our Galaxy. This allowed him to determine the distance to the center of the Galaxy. In 1924 Edwin Hubble used Cepheids to show that the Andromeda Nebula is very much like our Milky Way Galaxy. Both are large ensembles of a couple hundred billion stars. And the A ...
Hubble - 15 Years of Discovery
... dim fuzzy patch, called the Andromeda Nebula. Some thought that such clouds and nebulae were not part of our Milky Way galaxy. The conjecture was that they were in fact neighbouring galaxies, consisting of many stars, but located so far away that they appeared as fuzzy blobs. So finding the distance ...
... dim fuzzy patch, called the Andromeda Nebula. Some thought that such clouds and nebulae were not part of our Milky Way galaxy. The conjecture was that they were in fact neighbouring galaxies, consisting of many stars, but located so far away that they appeared as fuzzy blobs. So finding the distance ...
21_Testbank
... light but extraordinary when they are observed in infrared light. Answer: Starburst galaxies are filled with star-forming molecular clouds, which contain dust grains that absorb most of the visible light produced by the young stars. This radiation heats the dust grains to very high temperatures, and ...
... light but extraordinary when they are observed in infrared light. Answer: Starburst galaxies are filled with star-forming molecular clouds, which contain dust grains that absorb most of the visible light produced by the young stars. This radiation heats the dust grains to very high temperatures, and ...
Chapter 24 Studying the Sun Section 1 The Study of Light Key
... telescopes. Most large optical telescopes are reflectors. Light does not pass through a mirror so the glass for a reflecting telescope does not have to be of optical quality. In addition, a lens can be supported only around the edge, so it sags. Mirrors, on the other hand, can be supported fully fro ...
... telescopes. Most large optical telescopes are reflectors. Light does not pass through a mirror so the glass for a reflecting telescope does not have to be of optical quality. In addition, a lens can be supported only around the edge, so it sags. Mirrors, on the other hand, can be supported fully fro ...
Unit 2 - Astronomy
... Galaxies and Stars • Stars have a life cycle and undergo stellar evolution • Stars originate from a cloud of dust and gases • Gravity causes them to clump together and form larger balls of dust and gases ...
... Galaxies and Stars • Stars have a life cycle and undergo stellar evolution • Stars originate from a cloud of dust and gases • Gravity causes them to clump together and form larger balls of dust and gases ...
lecture25
... Three key things to keep in mind about the Milky Way 1) The Milky Way is an ecosystem for stars. 2) The Milky Way is mostly empty space … but it is rather dusty. 3) The Milky Way barely moves at all on the scale of a human lifetime. ...
... Three key things to keep in mind about the Milky Way 1) The Milky Way is an ecosystem for stars. 2) The Milky Way is mostly empty space … but it is rather dusty. 3) The Milky Way barely moves at all on the scale of a human lifetime. ...
Elementary Science Research and Reflection Project
... The event known as a shooting or falling star has nothing at all to do with a star! The amazing streaks of light that can sometimes be seen in the night sky are caused by tiny bits of dust and rock called meteoroids falling into earth’s atmosphere and burning up. ...
... The event known as a shooting or falling star has nothing at all to do with a star! The amazing streaks of light that can sometimes be seen in the night sky are caused by tiny bits of dust and rock called meteoroids falling into earth’s atmosphere and burning up. ...
Gravitational Lensing Abstract
... complete Einstein ring has been found around clusters due to the facts that most clusters are not really spherical mass distributions and since the alignment between the lens and source are not perfect. Giant arcs can be exploited in two ways, as is typical for many lensing phenomena. Firstly they p ...
... complete Einstein ring has been found around clusters due to the facts that most clusters are not really spherical mass distributions and since the alignment between the lens and source are not perfect. Giant arcs can be exploited in two ways, as is typical for many lensing phenomena. Firstly they p ...
Quentin Parker Lecture 1b - PowerPoint file.
... There are 200 billion stars in our galaxy . . . one of them is our Sun. Our galaxy is so large that if you could travel at the speed of light, it would take you 100,000 years to go from one side to the other. And this giant "city of stars" known as the Milky Way Galaxy is only one of billions of ot ...
... There are 200 billion stars in our galaxy . . . one of them is our Sun. Our galaxy is so large that if you could travel at the speed of light, it would take you 100,000 years to go from one side to the other. And this giant "city of stars" known as the Milky Way Galaxy is only one of billions of ot ...
Our Galaxy, the Milky Way Galaxy
... Rotation curve – Stars near the edges of galaxies move at the same speed as the stars near the center The Milky Way Galaxy is surrounded by a Dark Matter Halo and this is what holds the galaxy together. We have no clue what it’s made up of because it doesn’t radiate any sort of light (visible or oth ...
... Rotation curve – Stars near the edges of galaxies move at the same speed as the stars near the center The Milky Way Galaxy is surrounded by a Dark Matter Halo and this is what holds the galaxy together. We have no clue what it’s made up of because it doesn’t radiate any sort of light (visible or oth ...
Galaxies, Cosmology and the Accelera`ng Universe
... • Current thinking is that the thick disk stars were originally in the thin disk but were sca?ered • (some recent observa6ons suggest that there is not such a big difference between the thick and ...
... • Current thinking is that the thick disk stars were originally in the thin disk but were sca?ered • (some recent observa6ons suggest that there is not such a big difference between the thick and ...
December 2015 - Hermanus Astronomy
... dune Curiosity will investigate is as tall as a two-story building and as broad as a football field. The Bagnold Dunes are active — images from orbit indicate some of them are migrating as much as about 1m per Earth year. No active dunes have been visited anywhere in the solar system besides Earth. ...
... dune Curiosity will investigate is as tall as a two-story building and as broad as a football field. The Bagnold Dunes are active — images from orbit indicate some of them are migrating as much as about 1m per Earth year. No active dunes have been visited anywhere in the solar system besides Earth. ...
Chandra`s X-ray vision seeks out black holes
... lack holes may be impossible to observe directly, but NASA’s Chandra X-ray Observatory is finding evidence for their existence throughout the observable universe. At the 198th meeting of the American Astronomical Society in Pasadena, three independent teams of scientists reported finding dozens of X ...
... lack holes may be impossible to observe directly, but NASA’s Chandra X-ray Observatory is finding evidence for their existence throughout the observable universe. At the 198th meeting of the American Astronomical Society in Pasadena, three independent teams of scientists reported finding dozens of X ...
Larger, high-res file, best for printing
... world was excited by the discovery of a new planet. Clyde Tombaugh at the Lowell Observatory found this faint object in the course of a long search instigated by Percival Lowell. Lowell and others believed that there were discrepancies between prediction and observation of the motions of Uranus and ...
... world was excited by the discovery of a new planet. Clyde Tombaugh at the Lowell Observatory found this faint object in the course of a long search instigated by Percival Lowell. Lowell and others believed that there were discrepancies between prediction and observation of the motions of Uranus and ...
The life and times of stars
... A galaxy will give out a continuous spectrum as it has billions of different sources The surface of the Sun gives out a continuous spectrum – it is an incandescent body The Sun’s atmosphere will produce an absorption spectrum as it is a gas that the Sun’s light is shining through Most nebula will pr ...
... A galaxy will give out a continuous spectrum as it has billions of different sources The surface of the Sun gives out a continuous spectrum – it is an incandescent body The Sun’s atmosphere will produce an absorption spectrum as it is a gas that the Sun’s light is shining through Most nebula will pr ...
Hubble Deep Field
The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, about one 24-millionth of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres. The image was assembled from 342 separate exposures taken with the Space Telescope's Wide Field and Planetary Camera 2 over ten consecutive days between December 18 and December 28, 1995.The field is so small that only a few foreground stars in the Milky Way lie within it; thus, almost all of the 3,000 objects in the image are galaxies, some of which are among the youngest and most distant known. By revealing such large numbers of very young galaxies, the HDF has become a landmark image in the study of the early universe, with the associated scientific paper having received over 900 citations by the end of 2014.Three years after the HDF observations were taken, a region in the south celestial hemisphere was imaged in a similar way and named the Hubble Deep Field South. The similarities between the two regions strengthened the belief that the universe is uniform over large scales and that the Earth occupies a typical region in the Universe (the cosmological principle). A wider but shallower survey was also made as part of the Great Observatories Origins Deep Survey. In 2004 a deeper image, known as the Hubble Ultra-Deep Field (HUDF), was constructed from a few months of light exposure. The HUDF image was at the time the most sensitive astronomical image ever made at visible wavelengths, and it remained so until the Hubble Extreme Deep Field (XDF) was released in 2012.