Astronomy 101 Section 4
... Our tour continues with a visit to the nearest galaxies - here the Large Magellanic Cloud. ...
... Our tour continues with a visit to the nearest galaxies - here the Large Magellanic Cloud. ...
2014 Joseph E. Pesce, Ph.D. 1 Astro 113 Final Exam Review 1. What
... 27. Why does the region of the sky called the “Milky Way” have a larger concentration of stars than other regions? 28. What is an effect of a large fraction of dark matter in the Universe? ...
... 27. Why does the region of the sky called the “Milky Way” have a larger concentration of stars than other regions? 28. What is an effect of a large fraction of dark matter in the Universe? ...
Slide 1
... There are probably more than 170 billion (1.7 × 1011) galaxies in the observable universe. Most galaxies are 1,000 to 100,000 parsecs in diameter and are usually separated by distances on the order of millions of parsecs (or megaparsecs). ...
... There are probably more than 170 billion (1.7 × 1011) galaxies in the observable universe. Most galaxies are 1,000 to 100,000 parsecs in diameter and are usually separated by distances on the order of millions of parsecs (or megaparsecs). ...
Chapter 7 Review Answers
... 13. It is unlikely that we will travel across even our own galaxy because it is 100,000 ly across, meaning that it would take 100,000 years travelling at the speed of light to get across the galaxy. 14.All galaxies with a high rate of production of stars have lots of dust and gas, which are the birt ...
... 13. It is unlikely that we will travel across even our own galaxy because it is 100,000 ly across, meaning that it would take 100,000 years travelling at the speed of light to get across the galaxy. 14.All galaxies with a high rate of production of stars have lots of dust and gas, which are the birt ...
Nineteenth lecture
... The nebulae gradually collapse and commonly start rotating, to form galaxies, like the Andromeda Galaxy, pictured here. (Note the other galaxies also in the picture!) ...
... The nebulae gradually collapse and commonly start rotating, to form galaxies, like the Andromeda Galaxy, pictured here. (Note the other galaxies also in the picture!) ...
Components of Universe
... Galaxies contain more than just stars. The irregular-looking blobs are either hot (pink) or cold (dark) interstellar clouds ...
... Galaxies contain more than just stars. The irregular-looking blobs are either hot (pink) or cold (dark) interstellar clouds ...
Where a limit?
... space vehicle which has been deduced into a circumterraneous orbit on October, 4th, 1957: represented a sphere, diameter 58 sm and weight — 83,6 kg, with the aerials established on it (them was 4, length 2,4m - 2,9м). In the case there were radio transmitters which transmitted signals to the Earth. ...
... space vehicle which has been deduced into a circumterraneous orbit on October, 4th, 1957: represented a sphere, diameter 58 sm and weight — 83,6 kg, with the aerials established on it (them was 4, length 2,4m - 2,9м). In the case there were radio transmitters which transmitted signals to the Earth. ...
PARTS OF THE UNIVERSE
... v The Milky Way (our galaxy) is located in the Local Group. v The Local Group contains 36 galaxies. v The Local Group is part of the Virgo Supercluster (at least 100 galaxies). ...
... v The Milky Way (our galaxy) is located in the Local Group. v The Local Group contains 36 galaxies. v The Local Group is part of the Virgo Supercluster (at least 100 galaxies). ...
Astronomy Quiz #1 Answers
... 7. What are the two important discoveries made by Edwin Hubble? -many galaxies existed beyond the Milky Way -almost all galaxies are moving away from each other ...
... 7. What are the two important discoveries made by Edwin Hubble? -many galaxies existed beyond the Milky Way -almost all galaxies are moving away from each other ...
Ch. 27.3 Star Groups
... Patterns of stars in the sky, in which the stars are not necessarily close together. 88 constellations recognized by astronomers. Most don’t look like the figures they are named after. ...
... Patterns of stars in the sky, in which the stars are not necessarily close together. 88 constellations recognized by astronomers. Most don’t look like the figures they are named after. ...
Galaxy
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A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas and dust, and dark matter. The word galaxy is derived from the Greek galaxias (γαλαξίας), literally ""milky"", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few thousand (103) stars to giants with one hundred trillion (1014) stars, each orbiting their galaxy's own center of mass. Galaxies are categorized according to their visual morphology, including elliptical, spiral, and irregular. Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than our own Sun. As of July 2015, EGSY8p7 is the oldest and most distant galaxy with a light travel distance of 13.2 billion light-years from Earth, and observed as it existed 570 million years after the Big Bang. Previously, as of May 2015, EGS-zs8-1 was the most distant known galaxy, estimated to have a light travel distance of 13.1 billion light-years away and to have 15% of the mass of the Milky Way.Approximately 170 billion (1.7 × 1011) to 200 billion (2.0 × 1011) galaxies exist in the observable universe. Most of the galaxies are 1,000 to 100,000 parsecs in diameter and usually separated by distances on the order of millions of parsecs (or megaparsecs). The space between galaxies is filled with a tenuous gas with an average density less than one atom per cubic meter. The majority of galaxies are gravitationally organized into associations known as galaxy groups, clusters, and superclusters. At the largest scale, these associations are generally arranged into sheets and filaments that are surrounded by immense voids.