Posted on Apr 26, 2020
APOD: 2020 April 26 - Edwin Hubble Discovers the Universe
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Good morning, Rallypoint. Today's Astronomy Picture of the Day (APOD) is titled "Edwin Hubble Discovers the Universe." One hundred years ago today, two men squared off at the Smithsonian Museum of Natural History in what has been called the Great Debate of Astronomy. The two astronomers were Harlow Shapely and Heber Curtis. Shapley believed that distant nebulae were relatively small and lay within the outskirts of Earth's home galaxy, while Curtis held that they were in fact independent galaxies, implying that they were exceedingly large and distant.
Fast forward three years. Edwin Hubble was comparing different plates created by the 100-inch telescope at the Mount Wilson Observatory. He was searching for "novae", stars which underwent a sudden increase in brightness. He found several on this plate and marked them with an "N". On October 6, 1923, he discovered that one was actually a type of variable star known as a cepheid - crossing out the "N" he wrote "Var!" (upper right). Cepheids, regularly varying, pulsating stars, serve as "standard candle" distance indicators. Identifying such a star allowed Hubble to show the Andromeda Nebula (the central image on this plate) was not a small cluster of stars and gas within our own galaxy, but a large galaxy in its own right at a substantial distance from the Milky Way. Hubble's discovery is responsible for our modern concept of a Universe filled with galaxies.
Fast forward three years. Edwin Hubble was comparing different plates created by the 100-inch telescope at the Mount Wilson Observatory. He was searching for "novae", stars which underwent a sudden increase in brightness. He found several on this plate and marked them with an "N". On October 6, 1923, he discovered that one was actually a type of variable star known as a cepheid - crossing out the "N" he wrote "Var!" (upper right). Cepheids, regularly varying, pulsating stars, serve as "standard candle" distance indicators. Identifying such a star allowed Hubble to show the Andromeda Nebula (the central image on this plate) was not a small cluster of stars and gas within our own galaxy, but a large galaxy in its own right at a substantial distance from the Milky Way. Hubble's discovery is responsible for our modern concept of a Universe filled with galaxies.
APOD: 2020 April 26 - Edwin Hubble Discovers the Universe
Posted from apod.nasa.gov
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Maj William W. 'Bill' Price good day my friend, I have said it once before and I will say it again, " no one does it better from Above" "Edwin Hubble Discovers the Universe;" is a great read/share. Thanks for the awesome astronomy read/share.
Maj Marty Hogan SPC Margaret Higgins COL Mikel J. Burroughs CPL Dave Hoover Lt Col Charlie Brown Lt Col John (Jack) Christensen SCPO Morris Ramsey TSgt Joe C. PVT Mark Zehner Sgt (Join to see) SSG Michael Noll SSG Robert Mark Odom SGT (Join to see) PO1 H Gene Lawrence SGT Steve McFarland CPL Douglas Chrysler PO3 Phyllis Maynard PO1 Tony Holland SPC Mark Huddleston
Maj Marty Hogan SPC Margaret Higgins COL Mikel J. Burroughs CPL Dave Hoover Lt Col Charlie Brown Lt Col John (Jack) Christensen SCPO Morris Ramsey TSgt Joe C. PVT Mark Zehner Sgt (Join to see) SSG Michael Noll SSG Robert Mark Odom SGT (Join to see) PO1 H Gene Lawrence SGT Steve McFarland CPL Douglas Chrysler PO3 Phyllis Maynard PO1 Tony Holland SPC Mark Huddleston
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Across The Universe (Remastered 2009)
Provided to YouTube by Universal Music Group Across The Universe (Remastered 2009) · The Beatles Let It Be 2009 Calderstone Productions Limited (a division...
Belated thank you my friend Maj William W. 'Bill' Price for posting the NASA Astronomy Picture of the Day (APOD) for Sunday, April 26, 2020 entitled "Edwin Hubble Discovers the Universe."
Image: Edwin Hubble Discovers the Universe - Image Credit & Copyright Courtesy Carnegie Institution for Science.
I had to chuckle at the title which implies the universe was unknown before he discovered this part of God's immense creation :-)
"Explanation: How big is our universe? This very question, among others, was debated by two leading astronomers 100 years ago today in what has become known as astronomy's Great Debate. Many astronomers then believed that our Milky Way Galaxy was the entire universe. Many others, though, believed that our galaxy was just one of many. In the Great Debate, each argument was detailed, but no consensus was reached. The answer came over three years later with the detected variation of single spot in the Andromeda Nebula, as shown on the original glass discovery plate digitally reproduced here. When Edwin Hubble compared images, he noticed that this spot varied, and so wrote "VAR!" on the plate. The best explanation, Hubble knew, was that this spot was the image of a variable star that was very far away. So M31 was really the Andromeda Galaxy -- a galaxy possibly similar to our own. The featured image may not be pretty, but the variable spot on it opened a door through which humanity gazed knowingly, for the first time, into a surprisingly vast cosmos."
Across The Universe (Remastered 2009)
https://www.youtube.com/watch?v=90M60PzmxEE
FYI COL Mikel J. Burroughs Col Carl Whicker Maj Bill Smith, Ph.D. Maj Robert Thornton Maj Marty Hogan CPT Paul Whitmer SPC Nancy Greene SFC John Lich SMSgt Lawrence McCarter PO1 H Gene Lawrence MSgt Robert "Rock" Aldi MSgt David Hoffman TSgt Joe C. TSgt David L. SPC Diana D. SSG Franklin Briant 1SG Joseph Dartey 1SG Steven Imerman 1SG John Highfill
Image: Edwin Hubble Discovers the Universe - Image Credit & Copyright Courtesy Carnegie Institution for Science.
I had to chuckle at the title which implies the universe was unknown before he discovered this part of God's immense creation :-)
"Explanation: How big is our universe? This very question, among others, was debated by two leading astronomers 100 years ago today in what has become known as astronomy's Great Debate. Many astronomers then believed that our Milky Way Galaxy was the entire universe. Many others, though, believed that our galaxy was just one of many. In the Great Debate, each argument was detailed, but no consensus was reached. The answer came over three years later with the detected variation of single spot in the Andromeda Nebula, as shown on the original glass discovery plate digitally reproduced here. When Edwin Hubble compared images, he noticed that this spot varied, and so wrote "VAR!" on the plate. The best explanation, Hubble knew, was that this spot was the image of a variable star that was very far away. So M31 was really the Andromeda Galaxy -- a galaxy possibly similar to our own. The featured image may not be pretty, but the variable spot on it opened a door through which humanity gazed knowingly, for the first time, into a surprisingly vast cosmos."
Across The Universe (Remastered 2009)
https://www.youtube.com/watch?v=90M60PzmxEE
FYI COL Mikel J. Burroughs Col Carl Whicker Maj Bill Smith, Ph.D. Maj Robert Thornton Maj Marty Hogan CPT Paul Whitmer SPC Nancy Greene SFC John Lich SMSgt Lawrence McCarter PO1 H Gene Lawrence MSgt Robert "Rock" Aldi MSgt David Hoffman TSgt Joe C. TSgt David L. SPC Diana D. SSG Franklin Briant 1SG Joseph Dartey 1SG Steven Imerman 1SG John Highfill
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Good "Sunday" Morning Bill. Thank you for tkaing the time Maj William W. 'Bill' Price to shared the APOD tilted "Edwin Hubble Discovers the Universe" this morning. May you and your family have a peaceful, safe, and healthy Sunday Bill.
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