Embed Notice

HTML Code

<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://mastodon.social/users/gutenberg_org/statuses/111459551088330863">Project Gutenberg (gutenberg_org@mastodon.social)'s status on Thursday, 23-Nov-2023 22:24:27 JST</a><a href="https://mastodon.social/@gutenberg_org" title="gutenberg_org@mastodon.social"><img src="https://gnusocial.jp/avatar/132842-48-20230813103534.webp" width="48" height="48" alt="Project Gutenberg" style="position: absolute; left: 0; top: 0;">Project Gutenberg</a></section><article><p>Edwin Hubble's discovery, that the Andromeda "nebula" is actually another island galaxy far outside our own Milky Way, is 1st published in The New York Times <a href="https://mastodon.social/tags/OTD" rel="tag">#OTD</a> in 1924.</p><p>He identified extragalactic Cepheid variable stars for the 1st time on astronomical photos of Andromeda by using the 100-inch Hooker telescope. His measurement demonstrated conclusively that the distance of the Great Andromeda Nebula was an entirely separate galaxy located a significant distance from the Milky Way. <a href="https://mastodon.social/tags/astronomy" rel="tag">#astronomy</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/2368388#notice-4676080">In conversation</a><time datetime="2023-11-23T22:24:27+09:00" title="Thursday, 23-Nov-2023 22:24:27 JST">about a year ago</time> <span>from <span><a href="https://mastodon.social/@gutenberg_org/111459551088330863" rel="external" title="Sent from mastodon.social via ActivityPub">mastodon.social</a></span></span><a href="https://mastodon.social/@gutenberg_org/111459551088330863">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/1871964">Image of the Andromeda Galaxy taken by Spitzer in infrared, 24 micrometres (Credit: NASA/JPL–Caltech/Karl D. Gordon, University of Arizona)NASA's Spitzer Space Telescope has captured stunning infrared views of the famous Andromeda galaxy to reveal insights that were only hinted at in visible light. This Spitzer's 24-micron mosaic is the sharpest image ever taken of the dust in another spiral galaxy. This is possible because Andromeda is a close neighbor to the Milky Way at a mere 2.5 million light-years away. The Spitzer multiband imaging photometer's 24-micron detector recorded 11,000 separate snapshots to create this new comprehensive picture. Asymmetrical features are seen in the prominent ring of star formation. The ring appears to be split into two pieces, forming the hole to the lower right. These features may have been caused by interactions with satellite galaxies around Andromeda as they plunge through its disk. Spitzer also reveals delicate tracings of spiral arms within this ring that reach into the very center of the galaxy. One sees a scattering of stars within Andromeda, but only select stars that are wrapped in envelopes of dust light up at infrared wavelengths. This is a dramatic contrast to the traditional view at visible wavelengths, which shows the starlight instead of the dust.</a></label><br><a href="https://files.mastodon.social/media_attachments/files/111/459/546/147/425/479/original/c992c5095f50b251.jpg" rel="external">https://files.mastodon.social/media_attachments/files/111/459/546/147/425/479/original/c992c5095f50b251.jpg</a></li></ol></footer></blockquote>

Corresponding Notice

Embed this notice
Project Gutenberg (gutenberg_org@mastodon.social)'s status on Thursday, 23-Nov-2023 22:24:27 JST Project Gutenberg
Edwin Hubble's discovery, that the Andromeda "nebula" is actually another island galaxy far outside our own Milky Way, is 1st published in The New York Times #OTD in 1924.
He identified extragalactic Cepheid variable stars for the 1st time on astronomical photos of Andromeda by using the 100-inch Hooker telescope. His measurement demonstrated conclusively that the distance of the Great Andromeda Nebula was an entirely separate galaxy located a significant distance from the Milky Way. #astronomy
In conversationabout a year ago from mastodon.socialpermalink
Attachments
1. Image of the Andromeda Galaxy taken by Spitzer in infrared, 24 micrometres (Credit: NASA/JPL–Caltech/Karl D. Gordon, University of Arizona) NASA's Spitzer Space Telescope has captured stunning infrared views of the famous Andromeda galaxy to reveal insights that were only hinted at in visible light. This Spitzer's 24-micron mosaic is the sharpest image ever taken of the dust in another spiral galaxy. This is possible because Andromeda is a close neighbor to the Milky Way at a mere 2.5 million light-years away. The Spitzer multiband imaging photometer's 24-micron detector recorded 11,000 separate snapshots to create this new comprehensive picture. Asymmetrical features are seen in the prominent ring of star formation. The ring appears to be split into two pieces, forming the hole to the lower right. These features may have been caused by interactions with satellite galaxies around Andromeda as they plunge through its disk. Spitzer also reveals delicate tracings of spiral arms within this ring that reach into the very center of the galaxy. One sees a scattering of stars within Andromeda, but only select stars that are wrapped in envelopes of dust light up at infrared wavelengths. This is a dramatic contrast to the traditional view at visible wavelengths, which shows the starlight instead of the dust.
  https://files.mastodon.social/media_attachments/files/111/459/546/147/425/479/original/c992c5095f50b251.jpg

Public

Embed Notice

HTML Code

Corresponding Notice