Posted tagged ‘Galaxies’

Your Tax Dollars At Work

January 1, 2013

NASA’s Picture of the Day for January 1, 2013:

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Here’s the image caption:

The Hubble Space Telescope captured a spectacular image of the bright star-forming ring that surrounds the heart of the barred spiral galaxy NGC 1097. In this image, the larger-scale structure of the galaxy is barely visible: its comparatively dim spiral arms, which surround its heart in a loose embrace, reach out beyond the edges of this frame.

This face-on galaxy, lying 45 million light-years away from Earth in the southern constellation of Fornax (The Furnace), is particularly attractive for astronomers. NGC 1097 is a Seyfert galaxy. Lurking at the very center of the galaxy, a supermassive black hole 100 million times the mass of our sun is gradually sucking in the matter around it. The area immediately around the black hole shines powerfully with radiation coming from the material falling in.

The distinctive ring around the black hole is bursting with new star formation due to an inflow of material toward the central bar of the galaxy. These star-forming regions are glowing brightly thanks to emission from clouds of ionized hydrogen. The ring is around 5000 light-years across, although the spiral arms of the galaxy extend tens of thousands of light-years beyond it.

Image Credit: NASA/ESA/Hubble

Just think:  if the Teahadists have their way, none of the engineering or aspiration that made the Hubble possible would see the light of day (or night) in the future.  Just sayin’.

Prom Night In The Cosmos/My High School Wasn’t Like This

March 31, 2011

A bit of (not quite) random beauty — and a lovely story parsecs from politics — for your morning pleasure:

(Link to a big  tiff here.)

The story:  This image is the winner in the second annual contest the Gemini Observatory runs for Australian high school students, in which teams identify objects in the night sky that could yield images of both scientific interest and sheer gorgeousness.  The students have to submit an essay defending their choice of object, and this year’s winners, five young women from the Sydney Girls High School, proposed taking a picture of a system of colliding galaxies* with the following scientific rationale:

“If enough colour data is obtained in the image it may reveal easily accessible information about the different populations of stars, star formation, relative rate of star formation due to the interaction, and the extent of dust and gas present in these galaxies.”

As the Gemini press release went on to report, the team also argued for, in essence, the transformative value of art  in the form of the artistry inherent in great works of science:

When viewers consider this image “in contrast to their daily life,” the team explained, “there is a significant possibility of a new awareness or perception of the age and scale of the universe, and their part in it.”

The data for this image were gathered by the Gemini South telescope — an eight meter monolithic mirror telescope of exceptional optical quality — using one of its primary instruments, a multi-object spectrograph in its imaging mode, serving as a camera.

As for the analysis of what we are actually seeing above, the Gemini press office writes:

The primary galaxy in the image (NGC 6872) exemplifies what happens when galaxies interact and their original structure and form is distorted. When galaxies like these grapple with each other, gravity tugs at their structures, catapulting spiral arms out to enormous distances. In NGC 6872, the arms have been stretched out to span hundreds of thousands of light-years—many times further than the spiral arms of our own Milky Way galaxy. Over hundreds of millions of years, NGC 6872’s arms will fall back toward the central part of the galaxy, and the companion galaxy (IC 4970) will eventually be merged into NGC 6872. The coalescence of galaxies often leads to a burst of new star formation. Already, the blue light of recently created star clusters dot the outer reaches of NGC 6872’s elongated arms. Dark fingers of dust and gas along the arms soak up the visible light. That dust and gas is the raw material out of which future generations of stars could be born.

So, who cares if our current politics is a social-engineering test-to-destruction experiment?  In galaxies far, far, away, they’re getting ready to restart the tape and try again.

You may consider this a cosmic open thread.

*For more images of colliding galaxies — surely some of the coolest objects in the sky — check out this collection of Hubble images.


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