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Most large Galaxies have the familiar spiral shaped disc.
Is it back? Yes. But this time it's Antares and Mars! The Moon will be out in full force this week - but what a wonderful place to explore. There is no astronomical delight more loaded with detail than our own natural satellite, so join us as we walk in the Alpine Valley, climb Mons Pico, survey the terrain of Clavius and even scale the "Great Wall"! There be a grand lunar occultation this week and the "Magnificent Machholz" will perform a 'fly-by' on Mirfak. Not enough? Then lend me your ears as you'll discover Radio JOVE. We'll color the cloudy skies with atmospheric phenomena and learn which "Twin" has many secrets! So open your eyes to the skies...
Because here's what's up!
One of the largest Hubble Space Telescope images ever made of a complete Galaxy is being unveiled today at the American Astronomical Society meeting in San Diego, Calif.
The Hubble telescope captured a display of starlight, glowing gas, and silhouetted dark clouds of interstellar dust in this 4-foot-by-8-foot image of the barred spiral Galaxy NGC 1300. NGC 1300 is considered to be prototypical of barred spiral galaxies. Barred spirals differ from normal spiral Galaxies in that the arms of the Galaxy do not spiral all the way into the center, but are connected to the two ends of a straight bar of stars containing the nucleus at its center.
Most large Galaxies have the familiar spiral shaped disc surrounding a central bulge. But when and how do these Galaxies take on their characteristic shape? New observations from the European Space Agency surveying 195 Galaxies have given Astronomers some clues. They've theorized that large Galaxies go through a process called "spiral Galaxy rebuilding", where Galaxies collide, merge, and then begin a period of furious star formation. Part of the gas that didn't fall in rebuilds a disc around the galactic core creating a new spiral galaxy. This process could be repeated many times, building up the Galaxy over billions of years.
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