Views of Spiral Galaxies Views of our Milky Way
... • Globular clusters: spherical halo of old stars ...
... • Globular clusters: spherical halo of old stars ...
File - The World of Astronomy
... million to over a trillion stars and can range in size from a few thousand to several hundred thousand light-years across. There are hundreds of billions of galaxies in the universe. Galaxies come in many different sizes, shapes and brightnesses and, like stars, are found alone, in pairs, or in larg ...
... million to over a trillion stars and can range in size from a few thousand to several hundred thousand light-years across. There are hundreds of billions of galaxies in the universe. Galaxies come in many different sizes, shapes and brightnesses and, like stars, are found alone, in pairs, or in larg ...
Exam # 3 – Tue 12/06/2011
... C. more or less the same length as that of the Sun D. 3 times longer than that of the Sun E. 300 times longer than that of the Sun 7. A white dwarf has high temperature and A. is bright relative to a hot main sequence star because it has a small radius B. is bright relative to a hot main sequence be ...
... C. more or less the same length as that of the Sun D. 3 times longer than that of the Sun E. 300 times longer than that of the Sun 7. A white dwarf has high temperature and A. is bright relative to a hot main sequence star because it has a small radius B. is bright relative to a hot main sequence be ...
8and10Dec_2014
... of the Milky Way by measuring the orbital velocities of dwarf galaxies in orbit around our galaxy • We can also count the number of stars in the galaxy, and estimate the galactic mass. The two numbers do not agree! • Rotation curves do not show the expected decrease in stars’ orbital velocities with ...
... of the Milky Way by measuring the orbital velocities of dwarf galaxies in orbit around our galaxy • We can also count the number of stars in the galaxy, and estimate the galactic mass. The two numbers do not agree! • Rotation curves do not show the expected decrease in stars’ orbital velocities with ...
The Moon
... you sorted yesterday? How were the cards from yesterday different from the cards last week when we looked at Solar System objects? Discuss at your table. ...
... you sorted yesterday? How were the cards from yesterday different from the cards last week when we looked at Solar System objects? Discuss at your table. ...
Document
... • Other galaxies like our own Milky Way? Appear as small globules like globular clusters in our galaxy. • Harlow Shapeley – NO, only other globular cluster of stars • Heber Curtis – YES, other galaxies like ‘island universes’ • Hubble settled the debate by measuring the large distances to other gala ...
... • Other galaxies like our own Milky Way? Appear as small globules like globular clusters in our galaxy. • Harlow Shapeley – NO, only other globular cluster of stars • Heber Curtis – YES, other galaxies like ‘island universes’ • Hubble settled the debate by measuring the large distances to other gala ...
galaxies, galaxies, galaxies!
... • ages of stars are mainly old; most as old as the galaxy • very little to know gas; it has been converted to stars already • overall structure is smooth- no clumpy areas like analogous to spiral arms in disks ...
... • ages of stars are mainly old; most as old as the galaxy • very little to know gas; it has been converted to stars already • overall structure is smooth- no clumpy areas like analogous to spiral arms in disks ...
Galaxy Classification
... • ages of stars are mainly old; most as old as the galaxy • very little to know gas; it has been converted to stars already • overall structure is smooth- no clumpy areas like analogous to spiral arms in disks ...
... • ages of stars are mainly old; most as old as the galaxy • very little to know gas; it has been converted to stars already • overall structure is smooth- no clumpy areas like analogous to spiral arms in disks ...
The Universe – Powerpoint
... Galaxies that don’t fit into the spiral or elliptical galaxies are considered irregular galaxies. They have a wide variety of shape and characteristics, and are frequently the result of when two or more galaxies collide. ...
... Galaxies that don’t fit into the spiral or elliptical galaxies are considered irregular galaxies. They have a wide variety of shape and characteristics, and are frequently the result of when two or more galaxies collide. ...
Milky Way Galaxy
... Galaxies are made up of stars that give off light (EM radiation). The types of radiation depends on the source. Hubble expected to find certain wavelengths of radiation from certain galaxies. What he actually noticed was that waves were actually longer than expected. Having longer waves caused them ...
... Galaxies are made up of stars that give off light (EM radiation). The types of radiation depends on the source. Hubble expected to find certain wavelengths of radiation from certain galaxies. What he actually noticed was that waves were actually longer than expected. Having longer waves caused them ...
Universe, Galaxies, Solar System
... Many scientists believe the Universe formed about 13.8 billion years ago. It is thought that the Universe started as a single point of extremely dense mass about the size of a dime, and when the energy could not be contained anymore, it expanded into the Universe we ...
... Many scientists believe the Universe formed about 13.8 billion years ago. It is thought that the Universe started as a single point of extremely dense mass about the size of a dime, and when the energy could not be contained anymore, it expanded into the Universe we ...
1 - WordPress.com
... It would take 100 000 years for a person to travel across just the stellar disk of the Milky Way galaxy, travelling at the speed of light.. 7. Not every star visible from Earth has a name. Why not? It is much easier to number the stars than to name each one since there are million/billions to name. ...
... It would take 100 000 years for a person to travel across just the stellar disk of the Milky Way galaxy, travelling at the speed of light.. 7. Not every star visible from Earth has a name. Why not? It is much easier to number the stars than to name each one since there are million/billions to name. ...
Galaxy Life Stories: Growing Up in a Violent Universe
... “invisible” interactions revealed in gas ...
... “invisible” interactions revealed in gas ...
7.2 Galaxies
... All galaxies contain stars, planets, and dust. Galaxies with more dust than others tend to produce more new stars, because stars form from dust and gases present in nebulae. Very ancient galaxies have almost no dust because it has all been used up in star-making. Ancient galaxies are thought t ...
... All galaxies contain stars, planets, and dust. Galaxies with more dust than others tend to produce more new stars, because stars form from dust and gases present in nebulae. Very ancient galaxies have almost no dust because it has all been used up in star-making. Ancient galaxies are thought t ...
The Guide to the Galaxies
... huge number of faint stars. Our Milky way is just one galaxy, a vast island of stars, among a vast number of other galaxies set in a Universe which is otherwise largely empty. ...
... huge number of faint stars. Our Milky way is just one galaxy, a vast island of stars, among a vast number of other galaxies set in a Universe which is otherwise largely empty. ...
The Milky Way is on a collision course with its neighbor, the
... and hurl it into intergalactic space. As the Local Group evolves, the Milky Way and Andromeda will begin to have a dynamical impact upon each other owing to their mutual gravitation. As a result, it’s possible the Sun — and Earth and the other planets — will be dragged into a tidal tail. During this ...
... and hurl it into intergalactic space. As the Local Group evolves, the Milky Way and Andromeda will begin to have a dynamical impact upon each other owing to their mutual gravitation. As a result, it’s possible the Sun — and Earth and the other planets — will be dragged into a tidal tail. During this ...
Irregular Galaxies
... A. Galaxies- large groupings of stars in space held together by the attraction of gravity ...
... A. Galaxies- large groupings of stars in space held together by the attraction of gravity ...
Star Systems and Galaxies
... • Contain very little gas and dust between stars • Old stars because little gas or dust and no stars are forming any longer ...
... • Contain very little gas and dust between stars • Old stars because little gas or dust and no stars are forming any longer ...
Great Migrations & other natural history tales
... Lecture 2 Stars Hubble sequence Galaxy classification Photometry ...
... Lecture 2 Stars Hubble sequence Galaxy classification Photometry ...
Hubble`s Classification of Galaxies (PDF version)
... He noted that the nebulae do not all look the same. What sorts of galaxies exist? Can they be classified in some useful way? What can we learn from this? ...
... He noted that the nebulae do not all look the same. What sorts of galaxies exist? Can they be classified in some useful way? What can we learn from this? ...
PREVIEW-Reading Quiz 09 - Chapter 15
... Why is the material that snakes in front of the background stars is so dark, with no light shining through? ...
... Why is the material that snakes in front of the background stars is so dark, with no light shining through? ...
Galaxies - science1d
... • The universe does not end at the Milky Way! • The Milky Way is part of a group of ________ galaxies ▫ This is called a galaxy cluster ▫ Ours is called the ___________________ More than _____________ stars are inside it ...
... • The universe does not end at the Milky Way! • The Milky Way is part of a group of ________ galaxies ▫ This is called a galaxy cluster ▫ Ours is called the ___________________ More than _____________ stars are inside it ...
Milky Way
The Milky Way is the galaxy that contains our Solar System. Its name ""milky"" is derived from its appearance as a dim glowing band arching across the night sky whose individual stars cannot be distinguished by the naked eye. The term ""Milky Way"" is a translation of the Latin via lactea, from the Greek γαλαξίας κύκλος (galaxías kýklos, ""milky circle""). From Earth the Milky Way appears as a band because its disk-shaped structure is viewed from within. Galileo Galilei first resolved the band of light into individual stars with his telescope in 1610. Until the early 1920s most astronomers thought that the Milky Way contained all the stars in the Universe. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies—now known to number in the billions.The Milky Way is a barred spiral galaxy that has a diameter usually considered to be roughly 100,000–120,000 light-years but may be 150,000–180,000 light-years. The Milky Way is estimated to contain 100–400 billion stars, although this number may be as high as one trillion. There are probably at least 100 billion planets in the Milky Way. The Solar System is located within the disk, about 27,000 light-years from the Galactic Center, on the inner edge of one of the spiral-shaped concentrations of gas and dust called the Orion Arm. The stars in the inner ≈10,000 light-years form a bulge and one or more bars that radiate from the bulge. The very center is marked by an intense radio source, named Sagittarius A*, which is likely to be a supermassive black hole.Stars and gases at a wide range of distances from the Galactic Center orbit at approximately 220 kilometers per second. The constant rotation speed contradicts the laws of Keplerian dynamics and suggests that much of the mass of the Milky Way does not emit or absorb electromagnetic radiation. This mass has been given the name ""dark matter"". The rotational period is about 240 million years at the position of the Sun. The Milky Way as a whole is moving at a velocity of approximately 600 km per second with respect to extragalactic frames of reference. The oldest stars in the Milky Way are nearly as old as the Universe itself and thus must have formed shortly after the Big Bang.The Milky Way has several satellite galaxies and is part of the Local Group of galaxies, which is a component of the Virgo Supercluster, which again is a component of the Laniakea Supercluster.