Clarksville, TN Online: News, Opinion, Arts & Entertainment.


Topic: Atmosphere

NASA’s Cassini spacecraft examines Methane Sea on Saturn’s moon Titan

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – Of the hundreds of moons in our solar system, Titan is the only one with a dense atmosphere and large liquid reservoirs on its surface, making it in some ways more like a terrestrial planet.

Both Earth and Titan have nitrogen-dominated atmospheres — over 95 percent nitrogen in Titan’s case. However, unlike Earth, Titan has very little oxygen; the rest of the atmosphere is mostly methane and trace amounts of other gases, including ethane. And at the frigid temperatures found at Saturn’s great distance from the sun, the methane and ethane can exist on the surface in liquid form.

Sunlight glints off of Titan's northern seas this near-infrared, color mosaic from NASA's Cassini spacecraft. (NASA/JPL/Univ. Arizona/Univ. Idaho)

Sunlight glints off of Titan’s northern seas this near-infrared, color mosaic from NASA’s Cassini spacecraft. (NASA/JPL/Univ. Arizona/Univ. Idaho)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA to use Spacecraft Orbiting Earth to track Air Pollution

 

Written by Steve Cole
NASA Headquarters

NASA - National Aeronautics and Space AdministrationWashington, D.C. – For more than three decades NASA has focused its space-faring skills and science chops CSI-like on an elusive global killer. Later this month, that pursuit takes us to East Asia. In a few years, part way to the moon.

We are getting close.

Air pollution causes an estimated 152,000 deaths a year across the Americas and more than 2 million deaths in the Western Pacific, according to the United Nations. Some parts of the world have a detailed view of local air quality from ground sensor networks and forecast models that generate public alerts. But for much of the world this type of information and warning are not available.

Satellites have documented that human-produced and natural air pollution can travel a long way. This 2014 NASA satellite image shows a long river of dust from western Africa (bottom of image) push across the Atlantic Ocean. (NASA)

Satellites have documented that human-produced and natural air pollution can travel a long way. This 2014 NASA satellite image shows a long river of dust from western Africa (bottom of image) push across the Atlantic Ocean. (NASA)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s Chandra X-ray Observatory studies Comet ISON and Comet PanSTARRS

 

Written by Molly Porter
NASA’s Marshall Space Flight Center

NASA - National Aeronautics and Space AdministrationHuntsville, AL – For millennia, people on Earth have watched comets in the sky. Many ancient cultures saw comets as the harbingers of doom, but today scientists know that comets are really frozen balls of dust, gas, and rock and may have been responsible for delivering water to planets like Earth billions of years ago.

While comets are inherently interesting, they can also provide information about other aspects of our Solar System. More specifically, comets can be used as laboratories to study the behavior of the stream of particles flowing away from the Sun, known as the solar wind.

Recently, astronomers announced the results of a study using data collected with NASA’s Chandra X-ray Observatory of two comets — C/2012 S1 (also known as “Comet ISON”) and C/2011 S4 (“Comet PanSTARRS”).

The Comets ISON and PanSTARRS in optical images taken by an astrophotographer, with insets showing the X-ray images from Chandra. (X-ray: NASA/CXC/Univ . of CT/B.Snios et al, Optical: DSS, Damian Peach ( damianpeach.com ))

The Comets ISON and PanSTARRS in optical images taken by an astrophotographer, with insets showing the X-ray images from Chandra. (X-ray: NASA/CXC/Univ . of CT/B.Snios et al, Optical: DSS, Damian Peach ( damianpeach.com ))

«Read the rest of this article»

Sections: Technology | No Comments
 


NASA’s New Horizons spacecraft examines the layers of Pluto’s atmosphere

 

NASA Headquarters

NASA - National Aeronautics and Space AdministrationWashington, D.C. – Scientists on NASA’s New Horizons mission team are learning more about the structure and behavior of Pluto’s complex atmosphere by discovering new attributes of its extensive haze layers. The hazes were first discovered by New Horizons in July, as the spacecraft swept past Pluto and made its historic first exploration of the mysterious world.

Mission scientists have discovered that the layers of haze in Pluto’s nitrogen atmosphere vary in brightness depending on illumination and viewpoint, yet the haze itself maintains its overall vertical structure.

NASA scientists have discovered that the layers of haze in Pluto’s nitrogen atmosphere vary in brightness depending on illumination and viewpoint, yet the haze itself maintains its overall vertical structure. (NASA)

NASA scientists have discovered that the layers of haze in Pluto’s nitrogen atmosphere vary in brightness depending on illumination and viewpoint, yet the haze itself maintains its overall vertical structure. (NASA)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA will connect Bigelow Expandable Activity Module to International Space Station, Saturday

 

Written by Cheryl Warner
NASA’s Headquarters

NASA - National Aeronautics and Space AdministrationWashington, D.C. – The first human-rated expandable structure that may help inform the design of deep space habitats is set to be installed to the International Space Station Saturday, April 16th. NASA Television coverage of the installation will begin at 5:30am EDT.

The Bigelow Expandable Activity Module (BEAM) will be attached to the station’s Tranquility module over a period of about four hours. Controllers in mission control at NASA’s Johnson Space Center in Houston will remove BEAM from the unpressurized trunk of SpaceX’s Dragon spacecraft, using the robotic Canadarm2, and move it into position next to Tranquility’s aft assembly port.

This artist’s concept depicts the Bigelow Expandable Activity Module attached to the International Space Station’s Tranquility module. (Bigelow Aerospace)

This artist’s concept depicts the Bigelow Expandable Activity Module attached to the International Space Station’s Tranquility module. (Bigelow Aerospace)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s Spitzer Space Telescope helps create Temperature Map of a Super Earth

 

Written by Whitney Clavin
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – Observations from NASA’s Spitzer Space Telescope have led to the first temperature map of a super-Earth planet — a rocky planet nearly two times as big as ours. The map reveals extreme temperature swings from one side of the planet to the other, and hints that a possible reason for this is the presence of lava flows.

“Our view of this planet keeps evolving,” said Brice Olivier Demory of the University of Cambridge, England, lead author of a new report appearing in the March 30 issue of the journal Nature. “The latest findings tell us the planet has hot nights and significantly hotter days. This indicates the planet inefficiently transports heat around the planet. We propose this could be explained by an atmosphere that would exist only on the day side of the planet, or by lava flows at the planet surface.”

This illustration shows one possible scenario for the hot, rocky exoplanet called 55 Cancri e, which is nearly two times as wide as Earth. (NASA/JPL-Caltech)

This illustration shows one possible scenario for the hot, rocky exoplanet called 55 Cancri e, which is nearly two times as wide as Earth. (NASA/JPL-Caltech)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s New Horizons spacecraft discovers former Lake of Frozen Nitrogen on Pluto

 

NASA Headquarters

NASA - National Aeronautics and Space AdministrationWashington, D.C. – NASA’s New Horizons spacecraft spied several features on Pluto that offer evidence of a time millions or billions of years ago when – thanks to much higher pressure in Pluto’s atmosphere and warmer conditions on the surface – liquids might have flowed across and pooled on the surface of the distant world.

“In addition to this possible former lake, we also see evidence of channels that may also have carried liquids in Pluto’s past,” said Alan Stern, Southwest Research Institute, Boulder, Colorado—principal investigator of New Horizons and lead author of the scientific paper.

Former frozen lake of nitrogen found near mountain range on Pluto. (NASA/JHUAPL/SwRI)

Former frozen lake of nitrogen found near mountain range on Pluto. (NASA/JHUAPL/SwRI)

«Read the rest of this article»

Sections: Technology | No Comments
 


NASA’s Cassini Spacecraft examines highest mountain on Saturn’s moon Titan

 

Written by Preston Dyches
NASA’a Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – In a nod to extraterrestrial mountaineers of the future, scientists working on NASA’s Cassini mission have identified the highest point on Saturn’s largest moon, Titan.

Titan’s tallest peak is 10,948 feet (3,337 meters) high and is found within a trio of mountainous ridges called the Mithrim Montes. The researchers found that all of Titan’s highest peaks are about 10,000 feet (3,000 meters) in elevation. The study used images and other data from Cassini’s radar instrument, which can peer through the obscuring smog of Titan’s atmosphere to reveal the surface in detail.

The trio of ridges on Titan known as Mithrim Montes is home to the hazy Saturnian moon's tallest peak. (NASA/JPL-Caltech/ASI)

The trio of ridges on Titan known as Mithrim Montes is home to the hazy Saturnian moon’s tallest peak. (NASA/JPL-Caltech/ASI)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA Spacecrafts orbiting Mars make revealing Gravity Map of the Red Planet

 

Written by William Steigerwald / Nancy Neal Jones

NASA’s Goddard Space Flight Center

NASA - National Aeronautics and Space AdministrationGreenbelt, MD – A new map of Mars’ gravity made with three NASA spacecraft is the most detailed to date, providing a revealing glimpse into the hidden interior of the Red Planet.

“Gravity maps allow us to see inside a planet, just as a doctor uses an X-ray to see inside a patient,” said Antonio Genova of the Massachusetts Institute of Technology (MIT), Cambridge. “The new gravity map will be helpful for future Mars exploration, because better knowledge of the planet’s gravity anomalies helps mission controllers insert spacecraft more precisely into orbit about Mars”

This Mars map shows variations in thickness of the planet's crust, the relatively thin surface layer overlying the mantle of the planet. It shows unprecedented detail derived from new mapping of variations in Mars' gravitational pull on orbiters. (NASA/GSFC/Scientific Visualization Studio)

This Mars map shows variations in thickness of the planet’s crust, the relatively thin surface layer overlying the mantle of the planet. It shows unprecedented detail derived from new mapping of variations in Mars’ gravitational pull on orbiters. (NASA/GSFC/Scientific Visualization Studio)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s New Horizons scientists have released papers that shed new light on the Pluto System

 

NASA Headquarters

NASA - National Aeronautics and Space AdministrationWashington, D.C. – A year ago, Pluto was just a bright speck in the cameras of NASA’s approaching New Horizons spacecraft, not much different than its appearances in telescopes since Clyde Tombaugh discovered the then-ninth planet in 1930.

But this week, in the journal Science, New Horizons scientists have authored the first comprehensive set of papers describing results from last summer’s Pluto system flyby.

This image of haze layers above Pluto’s limb was taken by the Ralph/Multispectral Visible Imaging Camera (MVIC) on NASA’s New Horizons spacecraft. About 20 haze layers are seen; the layers have been found to typically extend horizontally over hundreds of kilometers, but are not strictly parallel to the surface. For example, scientists note a haze layer about 3 miles (5 kilometers) above the surface (lower left area of the image), which descends to the surface at the right. (NASA/JHUAPL/SwRI/Gladstone et al./Science (2016))

This image of haze layers above Pluto’s limb was taken by the Ralph/Multispectral Visible Imaging Camera (MVIC) on NASA’s New Horizons spacecraft. About 20 haze layers are seen; the layers have been found to typically extend horizontally over hundreds of kilometers, but are not strictly parallel to the surface. For example, scientists note a haze layer about 3 miles (5 kilometers) above the surface (lower left area of the image), which descends to the surface at the right. (NASA/JHUAPL/SwRI/Gladstone et al./Science (2016))

«Read the rest of this article»

Sections: Technology | No Comments
 


Page 1 of 2712345...»

Personal Controls

Archives

    May 2016
    S M T W T F S
    « Apr    
    1234567
    891011121314
    15161718192021
    22232425262728
    293031