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The Daily Cosmos

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The Daily Cosmos

Cosmology
Astrophysics
Astronomy

Location: #science
Members: 57
Latest Activity: 3 hours ago

 

Cosmology - Astrophysics - Astronomy

 

Hubble Wallpaper - Awesome Hubble Images

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Comment by Michel on August 30, 2011 at 2:01pm

@doone - Message to Aliens is a keeper!!!

Comment by Michel on August 30, 2011 at 2:00pm

Eye-Candy: Makes an awesome wallpaper:

Shuttle launch as seen by skydivers 

 

(Click to enlarge)

 

Comment by Michel on August 30, 2011 at 1:00pm
Comment by Doone on August 30, 2011 at 12:07pm

 

 

Humanity 101 of the Day: Vlogbrother Hank Green presents visiting aliens with a time-saving primer on humans.

He writes:

What I want people to realize is, this isn’t a video about talking to aliens, it’s a video about understanding ourselves. We are stuck inside of humanity…it is the only way we have of experiencing things. Attempting to explain humanity to an imaginary, ignorant, intelligent being, actually sheds a great deal of light on the knowledge that we take for granted.

 

Comment by Michel on August 26, 2011 at 12:55pm

 

The Sun roils over Mexico

(Click the picture, it's impressive)

 

That hardly looks like the Sun, does it? That’s because he used a filter that blocks all the light we see except for a very narrow slice of color in the red part of the spectrum. That filter lets through only light from warm hydrogen, at just the right temperature to allow the electrons in the hydrogen atoms to drop from the third energy level to the second. You can picture the electron in an atom like it’s on a staircase, and only allowed (by quantum mechanics) to sit on a step, or move from one to the other. It takes energy to move it up a step, and gives off energy when it moves down. When it jumps down from the third to the second, it emits a photon — a particle of light — at a wavelength of 656.3 nanometers, and astronomers call this light  (H alpha).

The gas on the Sun’s surface emitting Hα is under furious stirring due to magnetic fields and other forces, and you can see that in the twisted, roiling appearance in this photo. I particularly like the dark arc just left of center: that’s a filament, an eruption of gas off the surface. It’s about 150,000 kilometers (90,000 miles) long! It’s a bit cooler than the surface material, so it’s darker, and we see it in silhouette. When those happen on the limb of the Sun they’re called prominences, and you can see several of those in this picture too.

Amazingly, this picture (which is really a mosaic of six separate shots) was taken using a telescope with only a 90 mm (3.5 inch) lens. The Coronado 90 mm telescope is a favorite of sidewalk astronomers, since it shows the Sun in amazing detail, but is totally safe to look through since it blocks almost all the Sun’s light. It’s common to see them at planetaria and museums, set up where passers-by can get a quick glimpse of the Sun. For most, it’s the first time they ever see the might and power of a star only 150 million kilometers away.

And if you want a sense of scale here, in the picture above the Sun is about 450 pixels across. On the same scale, our entire planet Earth would be only about 4 pixels across.

Just in case you were feeling big and important today.

 

(from Bad Astronomy)

 

 

Comment by Sydni Moser on August 26, 2011 at 8:48am

http://i.huffpost.com/gen/337762/thumbs/r-BLACK-HOLE-EATS-STAR-large570.jpg

Black Hole Eats Star: Researchers Detail Astounding Cosmic Occurrence (VIDEO)

Prepare to have your mind blown.

Back in March, when NASA's Swift spacecraft first detected what scientists believed to be a black hole eating a star 3.8 billion light years from earth, many didn't quite know what it would mean. But now it seems the cosmic event not only sent a beam of X-rays shooting towards earth, but it also rejuvenated the black hole.

 

NASA has put together a short video imagining the event, which you can see for yourself, below.

"Incredibly, this source is still producing X-rays and may remain bright enough for Swift to observe into next year," said David Burrows, professor of astronomy at Penn State University and lead scientist for the mission's X-Ray Telescope instrument, told NASA. "It behaves unlike anything we've seen before."

NASA's Goddard Space Flight Center explains why matter and X-rays are shooting out of the black hole:

As a star falls toward a black hole, it is ripped apart by intense tides. The gas is corralled into a disk that swirls around the black hole and becomes rapidly heated to temperatures of millions of degrees.

The black hole itself is enormous, potentially four times the size of the one at the center of the Milky Way, according to NASA. Even more incredibly, the massive hole seems to be shooting matter out of its center at 80 to 90 percent of the speed of light.

 

An event like this has never before been seen by scientists.

 

Earlier this year, NASA reported that the Swift telescope had detected dual black holes, that is, a supermassive blackhole at the center of a galaxy located extremely close to another galaxy with a blackhole at its center--a rarely observed occurrence.

 

At the 2011 Ted conference, Janna Levin, a professor of physics and astronomy at Barnard College, spoke to The Huffington Post about the "sound" of a black hole. Though black holes can't be seen directly, Levin likened their resonance to "someone knocking on the door, or mallets banging on a drum."

 

WATCH>>  http://www.huffingtonpost.com/2011/08/25/black-hole-eats-star-video...

 

Comment by Sydni Moser on August 23, 2011 at 9:59am

Comment by Jaume on August 22, 2011 at 10:54am

I'm sure they'll appreciate. Visit the Fabulous Sunken City! Disney would give Venice millions for a theme park with a name like that. And the locals could turn a profit from selling or renting scubas along with postcards and souvenirs.

Comment by Michel on August 22, 2011 at 10:32am

@ Jaume - Not sure Florida or other low-lying areas - think Venice, It. or New-Orleans - would appreciate much.

Comment by Neal on August 22, 2011 at 10:13am

Nice. =)

 
 
 

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