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The Daily Cosmos or Interesting Facts about the Universe

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The Daily Cosmos or Interesting Facts about the Universe

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Location: #science
Members: 58
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Cosmology - Astrophysics - Astronomy

 

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Big Bangers' Imaginations Supply Their Story's Only Support.

Started by Tom Sarbeck. Last reply by Joey Daniel Smith Dec 22, 2018. 7 Replies

'Hot Jupiter'

Started by Mrs.B. Last reply by Mrs.B Apr 9, 2016. 7 Replies

NASA's Solomon's Choice.

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Comment by Adriana on October 24, 2011 at 1:35pm

Wow. beautiful picture.

Comment by Michel on October 24, 2011 at 1:33pm

My new desktop background:

On Flickr:

Midwestern U.S. Night With Aurora Borealis (NASA, International Space Station, 09/29/11)

Editor's note: Incredible photos from the ISS! This has also been added to the NASA Views Earth at Night photoset: www.flickr.com/photos/28634332@N05/sets/72157625188331491/

The Midwestern United States at night with Aurora Borealis is featured in this image photographed by an Expedition 29 crew member on the International Space Station. The night skies viewed from the space station are illuminated with light from many sources. For example, the Midwestern United States presents a night-time appearance not unlike a patchwork quilt when viewed from orbit. The artificial light from human settlements appears everywhere with a characteristic yellow tinge in this photograph. But green light of the Aurora Borealis also appears strongly in this view (top left)—even seeming to be reflected off Earth's surface—in Canada—beneath the aurora. A small white patch of light is almost certainly lightning from a storm on the East coast (top right). Part of the International Space Station appears across the top of the image. This photograph highlights the Chicago, IL, metropolitan area as the largest cluster of lights at center, next to the dark patch of Lake Michigan. The other largest metropolitan areas include St. Louis, MO (lower right), Minneapolis--St. Paul, MN (left) and the Omaha--Council Bluffs region on the Nebraska--Iowa border (lower left). City light clusters give an immediate sense of relative city size; demographers have used night time satellite imagery to make estimates of city populations, especially in the developing world where city growth can be very rapid. The U.S. northeast seaboard lies in the most oblique (meaning viewed at an angle) part of the image at top right, just beyond the Appalachian Mts., a dark winding zone without major cities.

Scales change significantly in oblique views: Omaha is only 200 kilometers from Des Moines, but appears roughly the same distance from Minneapolis—which is actually 375 kilometers to the north of Des Moines. In addition to the major metropolitan areas, the rectangular NS/EW-oriented pattern of townships is clearly visible in the rural, lower left part of the image. This pattern instantly gives the sense of north orientation (toward the top left corner) and is a distinctive characteristic of the United States, so that ISS crew members can quickly know which continent they are flying over even at night. In contrast to the regular township pattern, interstate highways converge on St. Louis (e.g. Hwy 44), Chicago and other large cities, much like wheel spokes around a central hub. Rivers—major visual features in daylight—become almost invisible at night. The course of the Mississippi River appears as a slightly meandering zone from Minneapolis through St. Louis (dashed line)—the river course continues out of the lower right corner of the image.

 

Comment by Michel on October 24, 2011 at 12:59pm

@Syd - PLS upload as a Video =)

Comment by Sydni Moser on October 24, 2011 at 9:11am

Christoph Adami: Finding life we can't imagine

 

Uploaded by TEDtalksDirector on Oct 4, 2011

http://www.ted.com How do we search for alien life if it's nothing like the life that we know? At TEDxUIUC Christoph Adami shows how he uses his research into artificial life -- self-replicating computer programs -- to find a signature, a 'biomarker,' that is free of our preconceptions of what life is.

Comment by Michel on October 23, 2011 at 10:25am

This still from an animation by Analytical Graphics, Inc., depicts the re-entry of Germany's defunct ROSAT satellite in October 2011. 
CREDIT: Analytical Graphics, Inc.

This still from an animation by Analytical Graphics, Inc., depicts the re-entry of Germany's defunct ROSAT satellite in October 2011. This story was updated at 11:18 p.m. ET.

An old German satellite plunged to Earth today (Oct. 22) after languishing in a dead orbit for more than a decade, but officials do not yet know where it fell.

The 2.7-ton Roentgen Satellite, or ROSAT, slammed into Earth's atmosphere sometime between 9:45 p.m. EDT (0145 GMT Sunday) and 10:15 p.m. EDT (0215 GMT Sunday), according to officials at the German Aerospace Center.

"There is currently no confirmation if pieces of debris have reached Earth's surface," German aerospace officials said in a statement.

While the 21-year-old satellite broke apart as it re-entered Earth's atmosphere, German aerospace officials estimated that up to 30 pieces totaling 1.9 tons (1.7 metric tons), consisting mostly of the observatory's heat-resistant mirrors and ceramic parts, could survive the fiery trip and reach the surface of the planet.

Based on ROSAT's orbital path, these fragments could be scattered along a swath of the planet about 50 miles (80 kilometers) wide, German aerospace officials have said.

The satellite, which weighs 5,348 pounds (2,426 kilograms), was launched into orbit in June 1990 to study X-ray radiation from stars, comets, supernovas, nebulas and black holes, among other things. The satellite was originally designed for an 18-month mission, but it far outlived its projected lifespan. [Photos of Doomed ROSAT Satellite]

In 1998, the ROSAT's star tracker failed and its X-ray sensors pointed directly at the sun. This caused irreparable damage to the satellite, and it was officially decommissioned in February 1999.

More on Space.com

 

Comment by Michel on October 22, 2011 at 9:14pm
Comment by Doone has Fremdschämen on October 22, 2011 at 8:35pm

See Explanation. Clicking on the picture will download the highest resolution version available.

Io in True Color 
Credit: Galileo ProjectJPLNASA

Explanation: The strangest moon in the Solar System is bright yellow. This picture, an attempt to show how Io would appear in the "true colors" perceptible to the average human eye, was taken in 1999 July by the Galileo spacecraftthat orbited Jupiter from 1995 to 2003. Io's colors derive from sulfur and molten silicate rock. The unusual surface of Io is kept very young by its system of active volcanoes. The intense tidal gravity of Jupiter stretches Io and damps wobbles caused by Jupiter's other Galilean moons. The resulting friction greatly heats Io's interior, causing molten rock to explode through the surface. Io's volcanoes are so active that they are effectively turning the whole moon inside out. Some of Io's volcanic lava is so hot it glows in the dark.

 

 

Comment by Doone has Fremdschämen on October 22, 2011 at 8:35pm

See Explanation. Clicking on the picture will download the highest resolution version available.

The Veil Nebula 
Credit & CopyrightMartin Pugh 

Explanation: Delicate in appearance, these filaments of shocked, glowing gas, draped in planet Earth's sky toward the constellation of Cygnus, make up the Veil Nebula. The nebula is a large supernova remnant, an expanding cloud born of the death explosion of a massive star. Light from the original supernova explosion likely reached Earth over 5,000 years ago. Also known as the Cygnus Loop, the Veil Nebula now spans nearly 3 degrees or about 6 times the diameter of the full Moon. That translates to over 70 light-years at its estimated distance of 1,500 light-years. In fact, the Veil is so large its brighter parts are recognized as separate nebulae, including The Witch's Broom (NGC 6960) at the bottom of this stunning skyview and Pickering's Triangle (NGC 6979) below and right of center. At the top is the haunting IC 1340.

 

Comment by Doone has Fremdschämen on October 22, 2011 at 8:33pm

See Explanation. Clicking on the picture will download the highest resolution version available.

A Sharp View of the Sun 
Credit: SSTRoyal Swedish Academy of Sciences

Explanation: Here is one of the sharper views of the Sun ever taken. This stunning image shows remarkable details of a dark sunspot across the image bottom and numerous boiling granules which appear like kernels of corn across the top. Taken in 2002, the picture was made using the Swedish Solar Telescope operating on the Canary Island of La Palma. The high resolution image was achieved using sophisticated adaptive optics, digital image stacking, and other processing techniques to counter the blurring effect of Earth's atmosphere. Currently a sunspot group is crossing the Sun that is so large it can be easily seen by the cautious observer even without magnification.

 

Comment by Doone has Fremdschämen on October 20, 2011 at 10:28pm

2011 October 18 

Movie: Approaching Light Speed 
Image Credit & Copyright: Antony Searle & Craig Savage (ANU)

Explanation: What would it look like to travel near the speed of light? Strange visual effects would appear as documented in the above relativistically-accurate animation. First of all, relativistic aberration would cause objects to appear to bunch up in front you. Next, the Doppler shift would cause the colors of forward objects to shift toward the blue, while things behind you would shift toward the red. Similarly, the world in front of you would seem to move unusuallyfast, while the world behind you would appear to slow down. Objects to the sides will appear rotated, possibly enabling surfaces normally hidden from you to become visible. Of course, since constant motion is relative, the same effects would occur were you to remain stationary and the entire world advanced toward you.

 

 
 
 

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