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Şubat 2016

Gökhan Biçer  yeni bir  gönderide  bulundu.

NASA Introduces New, Wider Set of Eyes on the Universe | NASA

After years of preparatory studies, NASA is formally starting an astrophysics mission designed to help unlock the secrets of the universe -- the Wide Field Infrared Survey Telescope (WFIRST).
Aralık 2015

Gökhan Biçer  yeni bir  gönderide  bulundu.

2015 yılında, Güneş Sistemi'ne dair yapılmış çalışmalar.

NASA — Solar System: 2015 Year in Review

Solar System: 2015 Year in Review Two mysterious worlds explored for the first time. Liquid water seen flowing on Mars. A global ocean discovered hiding inside a moon of Saturn. Even during our Era of...
Aralık 2015

Can Evin  yeni bir  gönderide  bulundu.

NASA Telescopes Detect Jupiter-Like Storm on Small Star

This illustration shows a cool star, called W1906+40, marked by a raging storm near one of its poles. The storm is thought to be similar to the Great Red Spot on Jupiter. Scientists discovered it using NASA's Kepler and Spitzer space telescopes.

Credits: NASA/JPL-Caltech

Full image and caption

Astronomers have discovered what appears to be a tiny star with a giant, cloudy storm, using data from NASA's Spitzer and Kepler space telescopes. The dark storm is akin to Jupiter's Great Red Spot: a persistent, raging storm larger than Earth.

"The star is the size of Jupiter, and its storm is the size of Jupiter's Great Red Spot, " said John Gizis of the University of Delaware, Newark. "We know this newfound storm has lasted at least two years, and probably longer. " Gizis is the lead author of a new study appearing in The Astrophysical Journal.

While planets have been known to have cloudy storms, this is the best evidence yet for a star that has one. The star, referred to as W1906+40, belongs to a thermally cool class of objects called L-dwarfs. Some L-dwarfs are considered stars because they fuse atoms and generate light, as our sun does, while others, called brown dwarfs, are known as "failed stars" for their lack of atomic fusion.

The L-dwarf in the study, W1906+40, is thought to be a star based on estimates of its age (the older the L-dwarf, the more likely it is a star). Its temperature is about 3,500 degrees Fahrenheit (2,200 Kelvin). That may sound scorching hot, but as far as stars go, it is relatively cool. Cool enough, in fact, for clouds to form in its atmosphere.

"The L-dwarf's clouds are made of tiny minerals, " said Gizis.

Spitzer has observed other cloudy brown dwarfs before, finding evidence for short-lived storms lasting hours and perhaps days.

In the new study, the astronomers were able to study changes in the atmosphere of W1906+40 for two years. The L-dwarf had initially been discovered by NASA's Wide-field Infrared Survey Explorer in 2011. Later, Gizis and his team realized that this object happened to be located in the same area of the sky where NASA's Kepler mission had been staring at stars for years to hunt for planets.

Kepler identifies planets by looking for dips in starlight as planets pass in front of their stars. In this case, astronomers knew observed dips in starlight weren't coming from planets, but they thought they might be looking at a star spot -- which, like our sun's "sunspots, " are a result of concentrated magnetic fields. Star spots would also cause dips in starlight as they rotate around the star.

Follow-up observations with Spitzer, which detects infrared light, revealed that the dark patch was not a magnetic star spot but a colossal, cloudy storm with a diameter that could hold three Earths. The storm rotates around the star about every 9 hours. Spitzer's infrared measurements at two infrared wavelengths probed different layers of the atmosphere and, together with the Kepler visible-light data, helped reveal the presence of the storm.

While this storm looks different when viewed at various wavelengths, astronomers say that if we could somehow travel there in a starship, it would look like a dark mark near the polar top of the star.

The researchers plan to look for other stormy stars and brown dwarfs using Spitzer and Kepler in the future.

"We don't know if this kind of star storm is unique or common, and we don't why it persists for so long, " said Gizis.

Other authors of the study are: Adam Burgasser--University of California, San Diego; Kelle Cruz, Sara Camnasio and Munazza Alam--Hunter College, New York City, New York; Stanimir Metchev--University of Western Ontario, Canada; Edo Berger and Peter Williams--Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts; Kyle Dettman--University of Delaware, Newark; and Joseph Filippazzo--College of Staten Island, New York.

NASA's Ames Research Center in Moffett Field, California, manages the Kepler and K2 missions for NASA’s Science Mission Directorate. JPL managed Kepler mission development. Ball Aerospace & Technologies Corp. Operates the flight system with support from the Laboratory for Atmospheric and Space Physics at the University of Colorado in Boulder.

JPL manages the Spitzer Space Telescope mission for NASA. Science operations are conducted at the Spitzer Science Center at the California Institute of Technology in Pasadena. Spacecraft operations are based at Lockheed Martin Space Systems Company, Littleton, Colorado. Data are archived at the Infrared Science Archive housed at the Infrared Processing and Analysis Center at Caltech.
Aralık 2015

Gökhan Biçer  yeni bir  gönderide  bulundu.

NASA Teleskopu, Jüpiter üzerindeki fırtınaya benzer bir fırtınası olan küçük bir yıldız keşfetti.

NASA Telescopes Detect Jupiter-Like Storm on Small Star | NASA

A star the size of Jupiter has a raging, giant storm.
Temmuz 2015

Erhan Kılıç  yeni bir  gönderide  bulundu.

Plüton'un En Net Fotoğrafı Yayınlandı | Erhan Kılıç

New Horizon uzay aracı 9 yıldır uzayda seyahat etmekte. 4.82 milyon km mesafe katetmiş durumda. Bizim için uzun zamandır net görüntüsü bir gizem olan Plüton'u
Şubat 2015

Gökhan Biçer  yeni bir  gönderide  bulundu.

Şubat 2015

Gökhan Biçer  yeni bir  gönderide  bulundu.

Hubble Captures Rare Triple-Moon Conjunction | NASA

NASA's Hubble Space Telescope captured the rare occurrence of three of Jupiter's largest moons racing across the banded face of the gas-giant planet.
Ocak 2015

Erhan Kılıç  yeni bir  gönderide  bulundu.

Kızılötesi Işıkta Samanyolunun Merkezi | Erhan Kılıç

Hubble ve Spitzer uzay teleskopları Samanyolu'nun merkezini kızılötesinde fotoğraflıyorlar. Samanyolu'nun merkezini gözlemleyebilmek için kızılötesi spektrum...
Ocak 2015

Gökhan Biçer  yeni bir  gönderide  bulundu.

NASA Jet İtki Laboratuvarı, Mikro ve Nano Sistemler Grubu'nda geliştirilen beyin endoskopuyla üç boyutlu görüntüleme sağlanabiliyor.

3D Endoscope to Boost Safety, Cut Costs of Surgery

Ocak 2015

Gökhan Biçer  yeni bir  gönderide  bulundu.

NASA, Microsoft Collaboration Will Allow Scientists to ‘Work on Mars’ | NASA

NASA and Microsoft have teamed up to develop software called OnSight, a new technology that will enable scientists to work virtually on Mars using wearable technology called Microsoft HoloLens.
Ocak 2015

Erhan Kılıç  yeni bir  gönderide  bulundu.

Hubble'dan Yeni Yaratılış Sütunları Fotoğrafları | Erhan Kılıç

NASA/ESA Hubble Uzay Teleskobu, evrene dair bir sürü yeni fotoğraflar çekti. Yaratılış Sütunları (diğer adıyla fil hortumları) ise Kartal Bulutsusu'nun...
Aralık 2014

Hxdcml  yeni bir  gönderide  bulundu.

No Cry

Kadınların en etkileyici özelliği, erkeğe onun tarafından yönetiliyormuş hissi verip erkeklerin isteklerini belirleyebilmesi değil mi?
Aralık 2014

Erhan Kılıç  yeni bir  gönderide  bulundu.

Güneş'ten Yılbaşı Işığı - Günel Patlaması | Erhan Kılıç

Nasa'nın Güneş'i devamlı gözlemleyen Güneş Dinamikleri Gözlemevi 19 Aralık günü bu görüntüyü yakaladı. Güneş patlamaları güçlü radyasyon patlamalarıdır....

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