Showing posts with label space. Show all posts
Showing posts with label space. Show all posts

Wednesday, December 21, 2011

December 22 is a Solstice Day in 2011

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The December solstice occurs when the sun reaches its most southerly declination of -23.5 degrees. In other words, it is when the North Pole is tilted 23.5 degrees away from the sun. Depending on the Gregorian calendar, the December solstice occurs annually on a day between December 20 and December 23. On this date, all places above a latitude of 66.5 degrees north (Arctic Polar Circle) are now in darkness, while locations below a latitude of 66.5 degrees south (Antarctic Polar Circle) receive 24 hours of daylight.

Use the Sunrise and Sunset calculator to calculate the number of daylight hours in many cities worldwide during the December solstice.

The sun is directly overhead on the Tropic of Capricorn in the southern hemisphere during the December solstice. It also marks the longest day of the year in terms of daylight hours for those living south of the equator. Those living or travelling south from the Antarctic Circle towards the South Pole will see the midnight sun during this time of the year.

On the contrary, for an observer in the northern hemisphere, the December solstice marks the day of the year with the least hours of daylight. Those living or traveling north of the Arctic Circle towards the North Pole will not be able to see the sun during this time of the year.

more : via timeanddate.com

 

Posted via email from brexians posterous

Tuesday, December 6, 2011

The Habitable Exoplanets Catalog, a new online database of habitable worlds

Ggggggggggggg

Scientists are now starting to identify potential habitable exoplanets after nearly twenty years of the detection of the first planets around other stars. Over 700 exoplanets have been detected and confirmed with thousands more still waiting further confirmation by missions such as NASA Kepler.

Most of these are gas giants, similar to Jupiter and Neptune, but orbiting very dangerously close to their stars. Only a few have the right size and orbit to be considered suitable for any life.

Now the Planetary Habitability Laboratory (PHL) of the University of Puerto Rico at Arecibo (UPR Arecibo) presents a new assessment of the habitability of these worlds as part of its Habitable Exoplanets Catalog (HEC).

The catalog not only identifies new potential habitable exoplanets, including exomoons like the Pandora world in the movie Avatar, but also ranks them according to various habitability indices.

"One important outcome of these rankings is the ability to compare exoplanets from best to worst candidates for life", says Abel Mendez, Director of the PHL and principal investigator of the project.

According to Mendez, "New observations with ground and orbital observatories will discover thousands of exoplanets in the coming years. We expect that the analyses contained in our catalog will help to identify, organize, and compare the life potential of these discoveries."

The catalog lists and categorizes exoplanets discoveries using various classification systems, including tables of planetary and stellar properties. One of the classifications divides them into eighteen mass and thermal categories, creating a table similar to a periodic table for exoplanets.

Additional resources of the catalog will include scientific visualizations and stellar maps of exoplanets. Various undergraduate students participated in the project.

Only two confirmed exoplanets so far match the criteria for habitability in the catalog, Gliese 581d and HD 85512b, both still marginally Earth-like. However, the catalog identifies over 15 exoplanets and 30 exomoons as potential habitable candidates.

Future observations with new instruments, such as the proposed NASA Terrestrial Planet Finder (TPF), will be necessary to confirm the suitability for life of any of these candidates.

"I hope this database will help increase interest in building a big space-based telescope to observe exoplanets directly and look for possible signatures of life," says Jim Kasting, an expert on planetary habitability science from Penn State.

The catalog is available now online at the PHL website phl.upr.edu. A poster will be presented at the First Kepler Science Conference from December 5th to 9th, 2011 in NASA Ames, Moffet Field, California.

The PHL is a research and educational virtual laboratory dedicated to studies of the habitability of Earth, the Solar System, and exoplanets. The PHL is managed by the UPR Arecibo with the international collaboration of scientists from various institutions including NASA and SETI.

The catalog uses new habitability assessments like the Earth Similarity Index (ESI), the Habitable Zones Distance (HZD), the Global Primary Habitability (GPH), classification systems, and comparisons with Earth past and present. It also uses data from other databases, such as the Extrasolar Planets Encyclopaedia, the Exoplanet Data Explorer (exoplanets.org), the NASA Kepler Mission, and other sources.

 

 

Posted via email from brexians posterous

Tuesday, October 11, 2011

what wiil you do



"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν." "We both step and do not step in the same rivers. We are and are not." Heraclitus the Riddler

Sunday, May 1, 2011

NASA launches space shuttle Endeavour's final flight image

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Commissioned in 1987 to replace the space shuttle Challenger, which was lost in 1986, and named by elementary school students after the British HMS Endeavour, the sailing ship that took Captain James Cook on his first travels, the space shuttle Endeavour has earned a short but noteworthy place in NASA's history of space exploration.

The youngest of NASA's shuttle fleet, Endeavour was built with unique upgrades from previous orbiters, including the drag parachute used on landing; modified electrical and plumbing systems in the Extended Duration Orbiter (EDO), to allow for extended stays on board (up to 28 days); more-advanced computers and navigation systems; a solid-state star tracker; and improved steering mechanisms.

As a tool of space innovation, Endeavour has contributed to projects that have had far-reaching impacts on the space program, including the major Hubble Space Telescope repairs that improved Hubble's clarity, and 10 dockings with the International Space Station, during which Endeavour delivered and installed major sections of the international space outpost. This week will see the launch of mission STS-134, Endeavour's 25th and final flight, and the second-to-last space shuttle mission ever.

In this photo, Endeavour is seen on February 9, 2010, over the South Pacific Ocean off the coast of Southern Chile, at an altitude of 183 miles. The craft is silhouetted against the Earth as it prepares to dock with the International Space Station.

The orange troposphere, where all of the clouds we see from Earth are generated and contained, gives way to the whitish stratosphere and then to the mesosphere.

Posted via email from brexians posterous

Friday, May 14, 2010

beauty of nature....


beauty of nature...., originally uploaded by Vegaslyra.

New life bursting forth
Refreshed from winter's slumber
Rejoicing in spring.

Haiku - Seasons
by Veronica Ann Cech


"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν." "We both step and do not step in the same rivers. We are and are not." Heraclitus the Riddler

Tuesday, April 27, 2010

50 Years of Space Exploration


50 Years of Space Exploration, originally uploaded by Adam Crowe.
image by: books.nationalgeographic.com/map/map-day/index

via: www.stevey.com/2009/01/21/50-years-of-space-exploration/

Uploaded by Adam Crowe

"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν." "We both step and do not step in the same rivers. We are and are not." Heraclitus the Riddler

Thursday, April 15, 2010

The Great Orion Nebula...and N.Vrettakos

The Great Orion Nebula
The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated south[b] of Orion's Belt. It is one of the brightest nebulae, and is visible to the naked eye in the night sky. M42 is located at a distance of 1,344 ± 20 light years and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light years across. Older texts frequently referred to the Orion Nebula as the Great Nebula in Orion or the Great Orion Nebula.
The Orion Nebula is one of the most scrutinized and photographed objects in the night sky, and is among the most intensely studied celestial features. The nebula has revealed much about the process of how stars and planetary systems are formed from collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks, brown dwarfs, intense and turbulent motions of the gas, and the photo-ionizing effects of massive nearby stars in the nebula. There are also supersonic "bullets" of gas piercing the dense hydrogen clouds of the Orion Nebula. Each bullet is ten times the diameter of Pluto's orbit and tipped with iron atoms glowing bright blue. They were probably formed one thousand years ago from an unknown violent event.
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N. Vrettakos was born in the village of Kokees, near Sparta, and published his first collection of poems, Under Shadows and Lights, in 1929, at the age of seventeen. That same year he moved to Athens to attend university, but left after a year to take a series of jobs as a clerk in various businesses. In 1937 he began a thirty year career in the Greek Civil Service, also seeing combat service in the Greco-Italian War during this period. In 1967 he responded to the takeover of Greece by a military dictatorship by going into self-imposed exile in Switzerland and Italy, where he remained until returning to Greece in 1974. He also wrote a poem about Kostas Georgakis, the student who set himself ablaze in Genoa as a protest against the junta.
Nikiphoros Vretttakos was considered one of Greece's most important poets. He won a number of prizes and medals, including the Greek State Poetry Prize twice. Some of his poems became popular songs in musical settings by Greek composers, including Mikis Theodorakis. His verse was also translated into many languages. He was also elected as a member of the Academy of Athens in 1987.

Uploaded by brexians on 15 Apr 10, 10.31AM EEST.

"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν." "We both step and do not step in the same rivers. We are and are not." Heraclitus the Riddler

Friday, June 12, 2009

iMoon or eye moon?


iMoon or eye moon?, originally uploaded by xollob58.

The big sister in the sky is watching you... Some Photoshop fun with an old image of the cresent moon.



"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν."

"We both step and do not step in the same rivers. We are and are not."
Heraclitus the Riddler


Thursday, May 21, 2009

Obama STS-125 Atlantis Solar Transit

In this tightly cropped image, the NASA space shuttle Atlantis is seen in silhouette during solar transit, Tuesday, May 12, 2009, from Florida. This image was made before Atlantis and the crew of STS-125 had grappled the Hubble Space Telescope. Photo Credit: (NASA/Thierry Legault)



"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν."

"We both step and do not step in the same rivers. We are and are not."
Heraclitus the Riddler


Monday, May 4, 2009

macro - micro and between


Uploaded on authorSTREAM by astrocrazy
"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν."

"We both step and do not step in the same rivers. We are and are not."
Heraclitus the Riddler


Monday, April 27, 2009

a wormhole towards a new dimension

From Wikipedia, the free encyclopedia

a wormhole is a hypothetical topological feature of spacetime that is fundamentally a 'shortcut' through space and time. Spacetime can be viewed as a 2D surface and when 'folded' over, a wormhole bridge can be formed.
A wormhole has at least two mouths which are connected to a single throat or tube.
If the wormhole is traversable, matter can 'travel' from one mouth to the other by passing through the throat.
While there is no observational evidence for wormholes, spacetimes-containing wormholes are known to be valid solutions in general relativity.
The term wormhole was coined by the American theoretical physicist John Wheeler in 1957.
However, the idea of wormholes had already been theorized in 1921 by the German mathematician Hermann Weyl in connection with his analysis of mass in terms of electromagnetic field energy.
This analysis forces one to consider situations...where there is a net flux of lines of force through what topologists would call a handle of the multiply-connected space and what physicists might perhaps be excused for more vividly terming a ‘wormhole’.

—John Wheeler in Annals of Physics


"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν."

"We both step and do not step in the same rivers. We are and are not."
Heraclitus the Riddler


Thursday, April 9, 2009

Chandra, Hubble, and New Horizon View Jupiter (Redux, 3/24/09)

Chandra, Hubble, and New Horizon View Jupiter (Redux, 3/24/09)

This gorgeous view of Jupiter is from March of 2007. Still building older gems like this into the gallery. Hope this makes you guys feel "jovial." :)

Caption: On February 28, 2007, NASA's New Horizons spacecraft made its closest approach to Jupiter on its ultimate journey to Pluto. This flyby gave scientists a unique opportunity to study Jupiter using the package of instruments available on New Horizons, while coordinating observations from both space- and ground-based telescopes including NASA's Chandra X-ray Observatory.

In preparation for New Horizon's approach of Jupiter, Chandra took 5-hour exposures of Jupiter on February 8, 10, and 24th. In this new composite image, data from those separate Chandra's observations were combined, and then superimposed on the latest image of Jupiter from the Hubble Space Telescope.

The purpose of the Chandra observations is to study the powerful X-ray auroras observed near the poles of Jupiter. These are thought to be caused by the interaction of sulfur and oxygen ions in the outer regions of the Jovian magnetic field with particles flowing away from the Sun in the so-called solar wind. Scientists would like to better understand the details of this process, which produces auroras up to a thousand times more powerful than similar auroras seen on Earth.

Image credit: X-ray: NASA/CXC/SwRI/R.Gladstone et al.; Optical: NASA/ESA/Hubble Heritage (AURA/STScI)

Read full caption of original image:
chandra.harvard.edu/photo/2007/jupiter/

Learn more about Chandra:
www.nasa.gov/chandra

p.s. You can see all of our Chandra photos in the Chandra Group in Flickr at: www.flickr.com/groups/chandranasa/ We'd love to have you as a member!

Uploaded by nasa1fan on 24 Mar 09, 10.19PM EEST.

Saturday, April 4, 2009

pale blue dot

If you look carefully at the NASA photo below, you will see a little white dot. This minute speck is Earth seen from the Voyager 1 spacecraft as it exits the solar system, nearly 4 billion miles away. The photo was taken back in 1990.

Look again at that dot. That’s here. That’s home. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every “superstar,” every “supreme leader,” every saint and sinner in the history of our species lived there–on a mote of dust suspended in a sunbeam.
The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds.
Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.
The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.
It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we’ve ever known.
– Carl Sagan, Pale Blue Dot, 1994


"Ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν, εἶμέν τε καὶ οὐκ εἶμεν."

"We both step and do not step in the same rivers. We are and are not."
Heraclitus the Riddler


Monday, March 16, 2009

Thursday, March 12, 2009

Watching the Skies at the Ares Rocket Parachute Test (NASA, 3/4/09)

NASA and NASA engineers watch the skies during the Ares I drogue parachute test at the U.S. Army's Yuma Proving Ground near Yuma, Ariz., on Feb. 28, 2009.

Image credit: NASA/ATK

More about the test:
www.nasa.gov/mission_pages/constellation/ares/drogue_test...

More about the Ares rockets:
www.nasa.gov/ares