PC2491 Examples 2
... (4) Estimate the mean free path of a star in a region where the stellar density is 1 star pc-3 and typical stellar velocities are 10 km s-1 (assume all stars 1Mo). In the same region hydrogen atoms have a density of 106 m-3. Assume the hydrogen atoms to be elastic spheres of radius 10-8 m and only i ...
... (4) Estimate the mean free path of a star in a region where the stellar density is 1 star pc-3 and typical stellar velocities are 10 km s-1 (assume all stars 1Mo). In the same region hydrogen atoms have a density of 106 m-3. Assume the hydrogen atoms to be elastic spheres of radius 10-8 m and only i ...
The Universe and Galaxies - West Jefferson Local Schools
... - time is required for light to travel through space - light travels a little over 8 minutes from the sun to earth - the farther away an object/star is, the longer it takes for light to get to us, and the older the light is when it gets to us = “Light is OLD” - we see the past of other stars in the ...
... - time is required for light to travel through space - light travels a little over 8 minutes from the sun to earth - the farther away an object/star is, the longer it takes for light to get to us, and the older the light is when it gets to us = “Light is OLD” - we see the past of other stars in the ...
2. A giant hand took one of the planets discovered
... 2. A giant hand took one of the planets discovered around other stars and put it in the solar system at the same distance from the sun as from its star. The mass of the planet is approximately that of Jupiter and the orbit is approximately that of Earth. These are the “hot Jupiters”, as big as Jupit ...
... 2. A giant hand took one of the planets discovered around other stars and put it in the solar system at the same distance from the sun as from its star. The mass of the planet is approximately that of Jupiter and the orbit is approximately that of Earth. These are the “hot Jupiters”, as big as Jupit ...
ppt
... irregular (both old and young stars, lots of ISM, Irr I have a hint of structure eg Large Magellanic Cloud, SMC; Irr II have distorted shapes resulting mostly ...
... irregular (both old and young stars, lots of ISM, Irr I have a hint of structure eg Large Magellanic Cloud, SMC; Irr II have distorted shapes resulting mostly ...
Unit 1
... • In the 1700’s, Charles Messier was observing comets, and kept finding objects that while fuzzy, were not comets – He made a list (or catalog) of these undesired objects, so he could avoid seeing them – They became known as Messier Objects, a number preceded by an M. – M31 (the Andromeda galaxy) is ...
... • In the 1700’s, Charles Messier was observing comets, and kept finding objects that while fuzzy, were not comets – He made a list (or catalog) of these undesired objects, so he could avoid seeing them – They became known as Messier Objects, a number preceded by an M. – M31 (the Andromeda galaxy) is ...
ONLINE practice exam
... 3. What is actually located at the event horizon of a black hole? a.) Nothing b.) an infinitely dense concentration of mass c.) The outer boundary of a wormhole d.) a sphere of photons e.) The remnant of the star that collapsed to the black hole. 4. Most of the Lithium in the universe was formed: a. ...
... 3. What is actually located at the event horizon of a black hole? a.) Nothing b.) an infinitely dense concentration of mass c.) The outer boundary of a wormhole d.) a sphere of photons e.) The remnant of the star that collapsed to the black hole. 4. Most of the Lithium in the universe was formed: a. ...
The Universe and Galaxies - West Jefferson Local Schools
... - ________ - grouping of millions or billions of stars, and dust and gas held together by gravity - there are an estimated ________ billion galaxies in the universe A. 3 Types of Galaxies - classified by ________ 1. ________ - disk shaped with spiral arms of dust and gas (fig 26-15, pg. 831) - dust ...
... - ________ - grouping of millions or billions of stars, and dust and gas held together by gravity - there are an estimated ________ billion galaxies in the universe A. 3 Types of Galaxies - classified by ________ 1. ________ - disk shaped with spiral arms of dust and gas (fig 26-15, pg. 831) - dust ...
The Universe and Galaxies - West Jefferson Local Schools
... I. What is the universe? - universe - sum of all _________ and energy that ever has, does, and ever will exist everything physical that exists in _________ and _________ - _________ – the study of how the universe began, what it is made of and how it continues to evolve and change - Of what is the ...
... I. What is the universe? - universe - sum of all _________ and energy that ever has, does, and ever will exist everything physical that exists in _________ and _________ - _________ – the study of how the universe began, what it is made of and how it continues to evolve and change - Of what is the ...
100 million years after the Big Bang
... For f/2 GMT mirror prime focus camera can be positioned on 20 meter tower beside mirror, pointing at mirror center GMT mirror 2 soon available (#1 used in SOML test tower) If AAO built static mirror cell, and Carnegie transported mirror to Las Campanas Observatory, it could be set up beside Magellan ...
... For f/2 GMT mirror prime focus camera can be positioned on 20 meter tower beside mirror, pointing at mirror center GMT mirror 2 soon available (#1 used in SOML test tower) If AAO built static mirror cell, and Carnegie transported mirror to Las Campanas Observatory, it could be set up beside Magellan ...
EXERCISES: Set 2 of 4 Q1: The absolute magnitude of the Sun in
... Q1: The absolute magnitude of the Sun in the optical V band is MV = 4.8. The brightness of the night sky at a dark astronomical site is 22 magnitudes per square arcsec in the V band. (a) At what distances would: (i) a star like the Sun, (ii) a globular cluster, (iii) a galaxy like the Milky Way be a ...
... Q1: The absolute magnitude of the Sun in the optical V band is MV = 4.8. The brightness of the night sky at a dark astronomical site is 22 magnitudes per square arcsec in the V band. (a) At what distances would: (i) a star like the Sun, (ii) a globular cluster, (iii) a galaxy like the Milky Way be a ...
lecture2_3
... •Study their motions, measure their speeds •Fundamental to understand the evolution of the sources and how their interact with each other (e.g. merging, collisions) •Measure their redshift, determine their distance from us •Fundamental to chart the large-scale structure of the Universe and to study ...
... •Study their motions, measure their speeds •Fundamental to understand the evolution of the sources and how their interact with each other (e.g. merging, collisions) •Measure their redshift, determine their distance from us •Fundamental to chart the large-scale structure of the Universe and to study ...
Galaxy Notes Presentation
... Mass is 1,000 to 2,000 billion times the mass of the Sun The Sun lies a little more than 30,000 light years from the center Cannot actually count the number of stars in the galaxy, can estimate as roughly 100 billion ...
... Mass is 1,000 to 2,000 billion times the mass of the Sun The Sun lies a little more than 30,000 light years from the center Cannot actually count the number of stars in the galaxy, can estimate as roughly 100 billion ...
Slide 1
... The Active Galactic Nuclei “Zoo” How we classify an AGN depends on how big the monster is and what angle we view it at. ...
... The Active Galactic Nuclei “Zoo” How we classify an AGN depends on how big the monster is and what angle we view it at. ...
News Release - האוניברסיטה העברית
... The question that emerged was how these galaxies were able to form stars so quickly and in large quantities at such an early stage without massive galactic mergers. In the article published in Nature, Prof. Dekel and his Hebrew University and French associates, pose their new theoretical model, whic ...
... The question that emerged was how these galaxies were able to form stars so quickly and in large quantities at such an early stage without massive galactic mergers. In the article published in Nature, Prof. Dekel and his Hebrew University and French associates, pose their new theoretical model, whic ...
Astronomy – The Milky Way Galaxy
... Formation of Galaxies 1. A Protogalactic cloud contains _____________ and ______________. 2. Halo stars begin to form as the protogalactic cloud starts to _______________. 3. Conservation of angular momentum ensures the remaining gas ___________ into a disk. 4. Billions of years later, the star-gas ...
... Formation of Galaxies 1. A Protogalactic cloud contains _____________ and ______________. 2. Halo stars begin to form as the protogalactic cloud starts to _______________. 3. Conservation of angular momentum ensures the remaining gas ___________ into a disk. 4. Billions of years later, the star-gas ...
Lecture 7
... stars, which form in clumps of interstellar gas. (These stellar clumps tend to get pulled apart as they orbit the galaxy, so older and redder populations are smoother-looking than younger ones.) The colors and clumpiness of galaxies progress along the Hubble sequence as you would expect: red and smo ...
... stars, which form in clumps of interstellar gas. (These stellar clumps tend to get pulled apart as they orbit the galaxy, so older and redder populations are smoother-looking than younger ones.) The colors and clumpiness of galaxies progress along the Hubble sequence as you would expect: red and smo ...
Study Guide 4 Part A Outline
... o The Hubble Law implies Universe is expanding The expansion started at some definite time in the past (the Big Bang)Universe expands away from every galaxy. Every galaxy would see its own version of the Hubble Law. Quasars & Active Galactic Nuclei o Quasars and other active galaxies emit large ...
... o The Hubble Law implies Universe is expanding The expansion started at some definite time in the past (the Big Bang)Universe expands away from every galaxy. Every galaxy would see its own version of the Hubble Law. Quasars & Active Galactic Nuclei o Quasars and other active galaxies emit large ...
5X_Measuring_galaxy_redshifts
... magnetic buttons (with miniature prisms). A robot sets up the field beforehand by drawing out each fibre from its storage and placing the button on a metal plate exactly where the light of a particular galaxy will fall. One field can be set up whilst another is being observed. ...
... magnetic buttons (with miniature prisms). A robot sets up the field beforehand by drawing out each fibre from its storage and placing the button on a metal plate exactly where the light of a particular galaxy will fall. One field can be set up whilst another is being observed. ...
Galaxies Powerpoint
... • A galaxy is a large grouping of stars, gas, and dust in space that are held together by gravity. • The largest galaxies contain more than a trillion stars. Smaller galaxies may have only a few million. • Scientists estimate the number of stars from the size and brightness of the galaxy. ...
... • A galaxy is a large grouping of stars, gas, and dust in space that are held together by gravity. • The largest galaxies contain more than a trillion stars. Smaller galaxies may have only a few million. • Scientists estimate the number of stars from the size and brightness of the galaxy. ...
Main Types of Galaxies
... • A galaxy is a large grouping of stars, gas, and dust in space that are held together by gravity. • The largest galaxies contain more than a trillion stars. Smaller galaxies may have only a few million. • Scientists estimate the number of stars from the size and brightness of the galaxy. ...
... • A galaxy is a large grouping of stars, gas, and dust in space that are held together by gravity. • The largest galaxies contain more than a trillion stars. Smaller galaxies may have only a few million. • Scientists estimate the number of stars from the size and brightness of the galaxy. ...
Distant galaxies and quasars The ages of things Light
... cosmological models. Details not important... confirms that halfway back is roughly z=0.5 and observations at z>3 show Universe when it was only 10-20% of its current age. ...
... cosmological models. Details not important... confirms that halfway back is roughly z=0.5 and observations at z>3 show Universe when it was only 10-20% of its current age. ...
Astronomy Unit 4 Galaxies
... 36. The approximate age of the universe determined by using Hubble’s Constant. __________________________________ 37. The distribution of galaxies in the universe is not ___________________, but clusters of galaxies lie within structures called ___________________ which surround empty regions called ...
... 36. The approximate age of the universe determined by using Hubble’s Constant. __________________________________ 37. The distribution of galaxies in the universe is not ___________________, but clusters of galaxies lie within structures called ___________________ which surround empty regions called ...
Ch. 21 notes-1
... It is one of our closest neighbors. 21.5 History of the Universe Explain the big bang theory of how the universe was formed. Describe how the solar system was formed. Introduction Andromeda Galaxy is the most distant object you can see with your unaided eye. Light travels for 2 million years bef ...
... It is one of our closest neighbors. 21.5 History of the Universe Explain the big bang theory of how the universe was formed. Describe how the solar system was formed. Introduction Andromeda Galaxy is the most distant object you can see with your unaided eye. Light travels for 2 million years bef ...
Pea galaxy
A Pea galaxy, also referred to as a Pea or Green Pea, might be a type of Luminous Blue Compact Galaxy which is undergoing very high rates of star formation. Pea galaxies are so-named because of their small size and greenish appearance in the images taken by the Sloan Digital Sky Survey (SDSS).Pea Galaxies were first discovered in 2007 by the volunteer users within the forum section of the online astronomy project Galaxy Zoo (GZ).