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Posts Tagged ‘International Space Station’

Why Galactic Cosmic Radiation Not Hit Astronauts?

In Astrophysics on March 7, 2013 at 17:10

We know thee is radiation and some thing called Galactic Cosmic radiation.

We are also told that it would endanger our health and might induce cancer .

We have been ending Astronauts into Space and there seems to be no effects of this radiation.

On the one hand Space science claims that thought there may be Radiation that might affect people in Space, but they are protected by the Earth’s Atmosphere.

If the Earth’s atmosphere can protect some one in Space , why can’t it in Earth?

And Astronauts are exposed to Space with out this protective () layer of Earth’ Atmosphere on ISS and they also carry out jobs in Space outside the ISS.

Yet some how, there seems to be no effects of radiation on the Astronauts.

Read the following interesting story on Boing Boing.

I was also curious on the effect of Space Travel on human body.

I have provided a link at the end of this post.

Very interesting, yet it left me totally confused as to what the answer to my question is!

Galactic Radiation

Galactic Radiation

“Galactic cosmic radiation — also called galactic cosmic rays — is the kind of radiation that researchers are most worried about. It’s made up particles, bits and pieces of atoms that were probably flung off from the aftermath of supernovas. The majority of this radiation, roughly 90%, is made up protons ripped from atoms of hydrogen. These particles travel around the galaxy at almost the speed of light.

And then they hit the Earth. This planet has a couple of defense mechanisms that protect us here on the ground from the impact of galactic cosmic radiation. First, Earth’s magnetic field both pushes away some of the particles and blocks others completely. Then, the particles that make it through that barrier start to encounter the atoms that make up our atmosphere.

If you drop a big tower made of Legos down the stairs it will break apart, losing more pieces every time it hits a new step. That’s a lot like what happens to galactic cosmic radiation in our atmosphere. The particles collide with atoms and break apart, forming new particles. Those new particles hit something else and also break apart. At each step, the particles lose energy. They get a little slower, a little weaker. By the time they “come to a stop” at the ground, they aren’t the galactic powerhouses they once were. It’s still radiation. But it’s much less dangerous radiation. Just like it would hurt a lot less to be hit with one Lego block, than with a whole tower of them.

All of the astronauts we’ve sent into space so far have, at least partially, benefited from Earth’s protective barriers, Francis Cucinotta told me. He’s the director of the NASA Space Radiobiology Program, the go-to guy for finding out how radiation hurts astronauts. He says, with the exception of Apollo flights to the Moon, the human presence in space has happened within the Earth’s magnetic field. The International Space Station, for instance, is above the atmosphere, but still well inside the first line of defense. Our astronauts aren’t exposed to the full force of galactic cosmic radiation.

They’re also exposed to it for a relatively limited amount of time. The longest spaceflight ever lasted a little over a year. And that matters, because the damage from radiation is cumulative. You simply can’t rack up as much risk on a six month jaunt to the ISS as you could, theoretically, on a multi-year excursion to Mars.

But what’s interesting, and concerning, is that even with those protections we do see signs of radiation damage to astronauts, Cucinotta told me.

The big thing is cataracts — changes in the lens of the eye that make it more opaque. With less light able to get into their eyes, people with cataracts lose some of their ability to see. In 2001,

http://boingboing.net/2013/01/04/how-space-radiation-hurts-astr.html

What Happens to Body in Space?

Human beings living on Earth are effected by gravity because about two-thirds of our daily activities are standing or sitting. Great amounts of body fluids such as blood pool in the lower part of the body. The human body is equipped with various mechanisms to oppose gravity to maintain sufficient blood flow to the brain.
In microgravity environment, the quantity and the distribution of body fluid alter, being free of the gravitational effect. This is the concept of “fluid shift.”

http://iss.jaxa.jp/med/index_e.html

Stunning Images From Space Photo Essay

In Astrophysics, images on February 11, 2013 at 18:59

These are the images from our known Universe.

Still GOD doesn’t Exist?

Sea Gull Nebula

Wings of the Seagull Nebula This image shows the intricate structure of part of the Seagull Nebula, known more formally as IC 2177. These wisps of gas and dust are known as Sharpless 2-296 (officially Sh 2-296) and form part of the “wings” of the celestial bird. This region of the sky is a fascinating muddle of intriguing astronomical objects — a mix of dark and glowing red clouds, weaving amongst bright stars. This new view was captured by the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile.

Color Crater on Mercury

Though Mercury is not known for having an especially colorful surface, some regions show a strong local contrast in color. Like other craters in Caloris, the interior and ejecta of Atget are darker and bluer than the typical brown volcanic plains. These craters help scientists to get a look at the three-dimensional compositional variations with the Caloris basin, and provide a way to judge the thickness of the volcanic plains (over 2 km here!). North is up in this image. These images were acquired as high-resolution targeted color observations. Targeted color observations are images of a small area on Mercury’s surface at resolutions higher than the 1-kilometer/pixel 8-color base map. During MESSENGER’s one-year primary mission, hundreds of targeted color observations were obtained. During MESSENGER’s extended mission, high-resolution targeted color observations are more rare, as the 3-color base map is covering Mercury’s northern hemisphere with the highest-resolution color images that are possible.

Pretty Veils in Orion

This esthetic close-up of cosmic clouds and stellar winds features LL Orionis, interacting with the Orion Nebula flow. Adrift in Orion’s stellar nursery and still in its formative years, variable star LL Orionis produces a wind more energetic than the wind from our own middle-aged Sun. As the fast stellar wind runs into slow moving gas a shock front is formed, analogous to the bow wave of a boat moving through water or a plane traveling at supersonic speed. The small, arcing, graceful structure just above and left of center is LL Ori’s cosmic bow shock, measuring about half a light-year across. The slower gas is flowing away from the Orion Nebula’s hot central star cluster, the Trapezium, located off the upper left corner of the picture. In three dimensions, LL Ori’s wrap-around shock front is shaped like a bowl that appears brightest when viewed along the “bottom” edge. The beautiful picture is part of a large mosaic view of the complex stellar nursery in Orion, filled with a myriad of fluid shapes associated with star formation.

Spiral Galaxy

The NASA/ESA Hubble Space Telescope – with a little help from an amateur astronomer – has produced one of the best views yet of nearby spiral galaxy Messier 106. Located a little over 20 million light-years away, practically a neighbour by cosmic standards, Messier 106 is one of the brightest and nearest spiral galaxies to our own. Despite its appearance, which looks much like countless other galaxies, Messier 106 hides a number of secrets. Thanks to this image, which combines data from Hubble with observations by amateur astronomers Robert Gendler and Jay GaBany, they are revealed as never before. At its heart, as in most spiral galaxies, is a supermassive black hole, but this one is particularly active. Unlike the black hole at the centre of the Milky Way, which pulls in wisps of gas only occasionally, Messier 106’s black hole is actively gobbling up material. As the gas spirals towards the black hole, it heats up and emits powerful radiation. Part of the emission from the centre of Messier 106 is produced by a process that is somewhat similar to that in a laser – although here the process produces bright microwave radiation.

Starburst Galaxy

Starburst Galaxy Messier 82, also known as the Cigar Galaxy, is a starburst galaxy about 12 million light-years away in the constellation Ursa Major. Starburst galaxies undergo extremely high rates of star formation and are thought to represent a particular phase in a galaxy’s evolution. Because of its excessive star birth, M82 is five times brighter than our own Milky Way galaxy

Haunting Ghost Nebula.

Haunting Ghost Nebula This image was obtained with the wide-field view of the Mosaic Camera on the Mayall 4-meter telescope at Kitt Peak National Observatory. vdB 141 is a reflection nebula located in the constellation Cepheus. Sometimes referred to as the ghost nebula, its awkward name is its catalog number in Sidney van den Bergh’s catalog of reflection nebulae, published in 1966. Several stars are embedded in the nebula. Their light gives it a ghoulish brown color. North is down and East is to the right. Imaged August 28, 2009.

Saturn Turbulence

This mosaic of images from NASA’s Cassini spacecraft shows the trail of a great northern storm on Saturn raging in full force. The contrast in the images has been enhanced to make the turbulent parts of the storm (in white) stand out without losing the details of the surrounding regions. The head of the storm is the set of bright clouds near the left of the image. A clockwise-spinning vortex spawned by the storm shortly after it erupted in early December 2010 can be seen in the middle. The head of the storm moved very swiftly westward, while the vortex drifted more slowly westward.

Two New Views of Andromeda

Top: In this new view of the Andromeda galaxy from the Herschel space observatory, cool lanes of forming stars are revealed in the finest detail yet. Herschel is a European Space Agency mission with important NASA participation. Andromeda, also known as M31, is the nearest major galaxy to our own Milky Way at a distance of 2.5 million light-years, making it an ideal natural laboratory to study star formation and galaxy evolution. Sensitive to the far-infrared light from cool dust mixed in with the gas, Herschel seeks out clouds of gas where stars are born. The new image reveals some of the very coldest dust in the galaxy — only a few tens of degrees above absolute zero — colored red in this image. By comparison, warmer regions such as the densely populated central bulge, home to older stars, take on a blue appearance. Intricate structure is present throughout the 200,000-light-year-wide galaxy with star-formation zones organized in spiral arms and at least five concentric rings, interspersed with dark gaps where star formation is absent. Andromeda is host to several hundred billion stars. This new image of it clearly shows that many more stars will soon to spark into existence. Bottom: The glow seen here comes from the longer-wavelength, or far, end of the infrared spectrum, giving astronomers the chance to identify the very coldest dust in our galactic neighbor. These light wavelengths span from 250 to 500 microns, which are a quarter to half of a millimeter in size. Herschel’s ability to detect the light allows astronomers to see clouds of dust at temperatures of only a few tens of degrees above absolute zero. These clouds are dark and opaque at shorter wavelengths. The Herschel view also highlights spokes of dust between the concentric rings.

Molecular Cloud in Monoceros

Molecular Cloud in Monoceros This image was obtained with the wide-field view of the Mosaic II camera on the Blanco 4-meter telescope at Cerro Tololo Interamerican Observatory on January 11th, 2012. It shows a portion of the giant Monceros R2 molecular cloud. It is a location of massive star formation, particularly in the location of the bright red nebula just below the center of the image. The image was generated with observations in the Sulphur [SII] (blue) and Hydrogen-Alpha (red) filters. In this image, north is to the right, and east is up.

 

Saturn's herding Moons.

Saturn’s Herding Moons The ring-region Saturnian moons Prometheus and Pan are both caught “herding” their respective rings in this image. Through their gravitational disturbances of nearby ring particles, one moon maintains a gap in the outer A ring and the other helps keep a ring narrowly confined. Prometheus (53 miles, or 86 kilometers across), together with Pandora (not seen in this image), maintains the narrow F ring seen at the bottom left in this image. Pan (17 miles, or 28 kilometers across) holds open the Encke gap in which it finds itself embedded in the center. The bright dot near the inner edge of the Encke gap is a background star.

Looking Down at Jupiter.

Looking Down at Jupiter These color maps of Jupiter were constructed from images taken by the narrow-angle camera onboard NASA’s Cassini spacecraft on Dec. 11 and 12, 2000, as the spacecraft neared Jupiter during its flyby of the giant planet. Cassini was on its way to Saturn. They are the most detailed global color maps of Jupiter ever produced. The smallest visible features are about 120 kilometers (75 miles) across. The maps are composed of 36 images: a pair of images covering Jupiter’s northern and southern hemispheres was acquired in two colors every hour for nine hours as Jupiter rotated beneath the spacecraft. Although the raw images are in just two colors, 750 nanometers (near-infrared) and 451 nanometers (blue), the map’s colors are close to those the human eye would see when gazing at Jupiter.

Vesta Crater in 3 D

Vesta Crater in 3D This composite-color view from NASA’s Dawn mission shows Cornelia Crater, streaked with dark materials, on the giant asteroid Vesta. The data were obtained by Dawn’s framing camera during the mission’s high-altitude mapping orbit, about 420 miles (680 kilometers) above the surface. The images were integrated into a mosaic and wrapped on a topographical model of Vesta’s surface.

Source.

http://www.wired.com/wiredscience/2013/01/space-photo-of-the-day-2/?pid=5940

 

Australia Wild Fire Photo Essay

In Australia, images on January 9, 2013 at 19:37

Australia is reeling under wild fire.

New South wales had as much as 165 wild Fires simultaneously yesterday.

Homes were destroyed and people left their Homes.

Photo Essay.

Australia Wild Fire.

Rural Fire Service (RFS) firefighters tackle a grass fire just outside of Gunning in New South Wales as more than 100 fires are still reported to be burning

Wild Fire Australia

Another view of Wild Fire Australia from International Space Station.

Wild Fire Australia.

Burnt Trees,Scorched Earth, Wild Fire Australia.

Wild fire Australia.

Horrific: Sheep burnt to death during a bushfire lay in a paddock near Bookham, near Canberra, in the Australian Capital Territory

Wild Fire Australia.

Menacing: Trees burns and smoke billows from a fire along the Princes Highway at Deans Gap in the Shoalhaven area in New South Wales

Wild Fire Australia

Divine intervention: A building burns near the jetty. The family credits God with their survival from the fire that destroyed around 90 homes in their town of Dunalley as the country was hit with record temperatures

Wild Fire,Australia.

Escaping the flames: The family’s pet dog Polly sought safety on the jetty as the family huddled together in the water

Australia Wild Fire.

Fight for survival: Grandmother Tammy Holmes (second left) takes refuge under a jetty with her five grandchildren as wildfires tear through their town of Dunalley in Tasmania. Just about able to stand, she grabs hold of (from l-r) two-year-old Charlotte and four-year-old Esther, while nine-year-old Liam clings to the wooden structure to keep his head above water as 11-year-old Matilda also reaches for the jetty while supporting six-year-old Caleb

Source:http://www.dailymail.co.uk/news/article-2259468/Australia-wildfires-Moment-terrified-family-forced-refuge.html

Related:

Australia is reeling under Fire with over 165 fires reported at the last count and the  Fire fighters are waging a grim battle.

The temperatures are expected to soar to 43 degrees.

http://ramanan50.wordpress.com/2013/01/08/australian-state-on-fire-nsw-live-updates/

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UFO Filmed by NASA During ‘Hurricane Sandy’ Video

In Astrophysics, videos on November 5, 2012 at 07:59

NASA has filmed a UFO during the recent Hurricane Sandy that bashed the US recently.

 

NASA Filmed UFO Over Hurricane Sandy From Space Station

 

English: The International Space Station as se...

English: The International Space Station as seen in its ULF3 configuration by the departing Space Shuttle Atlantis, following the departure of STS-129, which delivered ExPRESS Logistics Carriers 1 & 2 to the orbital outpost. The newly-arrived Russian Poisk module is also visible. (Photo credit: Wikipedia)

 

Related.Compilation of NASA UFO Video compilation.

 

 

 

 

 

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Istanbul By Night From Space Station Fabulous

In images on September 10, 2012 at 19:48

 

'Istanbul by Night' Jpg view from Space Station

Istanbul by Night

“Most of Istanbul’s Asian suburbs (image right) appear in this night view from the International Space Station, but only about half the area of the city on the European side is visible. The margins of the metropolitan area are clearly visible at night, more so than in daylight images in daylight images.

The Bosporus strait (also spelled Bosphorus) famously separates the two halves of the city and links the small Sea of Marmara (and the Mediterranean Sea) to the Black Sea. The strait is 31 kilometers (19 miles) long, most of which is visible in this view. The Bosporus is a very busy waterway, with larger ships passing north-south between the Black Sea and the Mediterranean, while competing with numerous ferries that cross east-west between the two halves of the city.

Apart from the Sea of Marmara and Black Sea, the other dark areas are wooded hills that provide open spaces for the densely populated city—one of the largest in Europe at 13.5 million inhabitants. The old city of Istanbul occupies the prominent point at the southern entrance to the strait. The brighter lines crossing the metropolitan area the major traffic arteries; bright lights also mark the shorelines. The First Bosporus Bridge and Second Bridge (also known as the Fatih Sultan Mehmet Bridge) span the strait. The brilliant lights of both international airports also stand out at image lower left and image lower right.”

http://earthobservatory.nasa.gov/IOTD/view.php?id=79116&src=twitter-iotd

 

 

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