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


NASA improves Storm Models and Forecasting since hurricane Katrina

 

Written by Kasha Patel
NASA’s Goddard Space Flight Center

NASA - National Aeronautics and Space AdministrationGreenbelt, MD – On August 28th, 2005, the National Hurricane Center issued a public notice warning people in New Orleans of “devastating damage expected…power outages will last for weeks…persons…pets…and livestock left exposed to the winds will be killed,” from the ensuing Hurricane Katrina.

The storm had formed near the Bahamas and south Florida before becoming a Category 2 hurricane over the Gulf region northwest of Key West. Then, in two days, the hurricane’s winds almost doubled to 175 mph, creating Category 5 Hurricane Katrina— the most intense hurricane in the past 36 years.

YouTube Preview Image «Read the rest of this article»


NASA reports Valley Land in California sinking due to Drought

 

Written by Alan Buis
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – As Californians continue pumping groundwater in response to the historic drought, the California Department of Water Resources today released a new NASA report showing land in the San Joaquin Valley is sinking faster than ever before, nearly 2 inches (5 centimeters) per month in some locations.

“Because of increased pumping, groundwater levels are reaching record lows — up to 100 feet (30 meters) lower than previous records,” said Department of Water Resources Director Mark Cowin. “As extensive groundwater pumping continues, the land is sinking more rapidly and this puts nearby infrastructure at greater risk of costly damage.”

Total subsidence in California's San Joaquin Valley for the period May 3, 2014 to Jan. 22, 2015, as measured by Canada's Radarsat-2 satellite. Two large subsidence bowls are evident, centered on Corcoran and south of El Nido. (Canadian Space Agency/NASA/JPL-Caltech)

Total subsidence in California’s San Joaquin Valley for the period May 3, 2014 to Jan. 22, 2015, as measured by Canada’s Radarsat-2 satellite. Two large subsidence bowls are evident, centered on Corcoran and south of El Nido. (Canadian Space Agency/NASA/JPL-Caltech)

«Read the rest of this article»


NASA’s Cassini Spacecraft takes one last close flyby of Saturn’s moon Dione

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – A pockmarked, icy landscape looms beneath NASA’s Cassini spacecraft in new images of Saturn’s moon Dione taken during the mission’s last close approach to the small, icy world. Two of the new images show the surface of Dione at the best resolution ever.

Cassini passed 295 miles (474 kilometers) above Dione’s surface at 11:33am PDT (2:33pm EDT) on August 17th. This was the fifth close encounter with Dione during Cassini’s long tour at Saturn. The mission’s closest-ever flyby of Dione was in December 2011, at a distance of 60 miles (100 kilometers).

This view from NASA's Cassini spacecraft looks toward Saturn's icy moon Dione, with giant Saturn and its rings in the background, just prior to the mission's final close approach to the moon on August 17, 2015. (NASA/JPL-Caltech/Space Science Institute)

This view from NASA’s Cassini spacecraft looks toward Saturn’s icy moon Dione, with giant Saturn and its rings in the background, just prior to the mission’s final close approach to the moon on August 17, 2015. (NASA/JPL-Caltech/Space Science Institute)

«Read the rest of this article»




NASA’s Mars Curiosity Rover leaves Marias Pass heading Southwest on Mars

 

Written by Guy Webster
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – NASA’s Curiosity Mars rover is driving toward the southwest after departing a region where for several weeks it investigated a geological contact zone and rocks that are unexpectedly high in silica and hydrogen content. The hydrogen indicates water bound to minerals in the ground.

In this “Marias Pass” region, Curiosity successfully used its drill to sample a rock target called “Buckskin” and then used the camera on its robotic arm for multiple images to be stitched into a self-portrait at the drilling site.

This low-angle self-portrait of NASA's Curiosity Mars rover shows the vehicle at the site from which it reached down to drill into a rock target called "Buckskin." (NASA/JPL-Caltech/MSSS)

This low-angle self-portrait of NASA’s Curiosity Mars rover shows the vehicle at the site from which it reached down to drill into a rock target called “Buckskin.” (NASA/JPL-Caltech/MSSS)

«Read the rest of this article»


NASA debunks internet rumors claiming an Asteroid will Impact Earth

 

Written by DC Agle
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – Numerous recent blogs and web postings are erroneously claiming that an asteroid will impact Earth, sometime between September 15th and 28th, 2015.

On one of those dates, as rumors go, there will be an impact — “evidently” near Puerto Rico — causing wanton destruction to the Atlantic and Gulf coasts of the United States and Mexico, as well as Central and South America.

That’s the rumor that has gone viral — now here are the facts.

NASA states there is NO Asteroid Threatening Earth. This view of Earth comes from NASA's Moderate Resolution Imaging Spectroradiometer aboard the Terra satellite. (NASA)

NASA states there is NO Asteroid Threatening Earth. This view of Earth comes from NASA’s Moderate Resolution Imaging Spectroradiometer aboard the Terra satellite. (NASA)

«Read the rest of this article»


NASA’s Global Precipitation Measurement satellite observes Typhoon Atsani building

 

Written by Harold F. Pierce
SSAI/NASA’s Goddard Space Flight Center

NASA - National Aeronautics and Space AdministrationGreenbelt, MD – Typhoon Atsani was an intensifying tropical storm moving over the open waters of the Pacific Ocean on August 16th, 2015 when the GPM core observatory satellite flew overhead.

The Global Precipitation Measurement or GPM mission core satellite passed over Atsani at 06:01am UTC (2:01am EDT). GPM is managed by both NASA and the Japan Aerospace Exploration Agency.

NASA-JAXA's GPM satellite saw rainfall south of the storm's center of circulation was falling at a rate of over 90 mm (3.5 inches) per hour and cloud tops to heights of 16.8 km (10.4 miles). (SSAI/NASA/JAXA, Hal Pierce)

NASA-JAXA’s GPM satellite saw rainfall south of the storm’s center of circulation was falling at a rate of over 90 mm (3.5 inches) per hour and cloud tops to heights of 16.8 km (10.4 miles). (SSAI/NASA/JAXA, Hal Pierce)

«Read the rest of this article»


NASA’s Lunar Atmosphere and Dust Environment Explorer (LADEE) discovers Neon in Moon’s Atmosphere

 

Written by William Steigerwald
NASA Goddard Space Flight Center

NASA - National Aeronautics and Space AdministrationGreenbelt, MD – The moon’s thin atmosphere contains neon, a gas commonly used in electric signs on Earth because of its intense glow. While scientists have speculated on the presence of neon in the lunar atmosphere for decades, NASA’s Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft has confirmed its existence for the first time.

“The presence of neon in the exosphere of the moon has been a subject of speculation since the Apollo missions, but no credible detections were made,” said Mehdi Benna of NASA’s Goddard Space Flight Center in Greenbelt, Maryland and the University of Maryland, Baltimore County. “We were very pleased to not only finally confirm its presence, but to show that it is relatively abundant.”

Artist’s concept of NASA's Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft in orbit above the moon. (NASA Ames / Dana Berry)

Artist’s concept of NASA’s Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft in orbit above the moon. (NASA Ames / Dana Berry)

«Read the rest of this article»




NASA’s Gemini Planet Imager discovers young Jupiter like planet

 

NASA’s Ames Research Center

NASA - National Aeronautics and Space AdministrationMoffett Field, CA – One of the best ways to learn how our solar system evolved is to look at younger star systems in the early stages of development. Recently, a team of astronomers including NASA scientists discovered a Jupiter-like planet within a young system that could serve as a decoder ring for understanding how planets formed around our sun.

The new planet, called 51 Eridani (Eri) b, is the first exoplanet discovered by the Gemini Planet Imager (GPI), a new instrument operated by an international collaboration, and installed on the 8-meter Gemini South Telescope in Chile.

Artistic conception of the Jupiter-like exoplanet 51 Eridani b, with the hot layers deep in its atmosphere glowing through the clouds. Because of its young age, this cousin of our own Jupiter is still hot and carries information on the way it was formed 20 million years ago. (Danielle Futselaar and Franck Marchis, SETI Institute)

Artistic conception of the Jupiter-like exoplanet 51 Eridani b, with the hot layers deep in its atmosphere glowing through the clouds. Because of its young age, this cousin of our own Jupiter is still hot and carries information on the way it was formed 20 million years ago. (Danielle Futselaar and Franck Marchis, SETI Institute)

«Read the rest of this article»


NASA’s Cassini spacecraft to make final pass of Saturn’s moon Dione

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – NASA’s Cassini spacecraft will zip past Saturn’s moon Dione on Monday, August 17th — the final close flyby of this icy satellite during the spacecraft’s long mission.

Cassini’s closest approach, within 295 miles (474 kilometers) of Dione’s surface, will occur at 11:33am PDT (2:33pm EDT). Mission controllers expect fresh images to begin arriving on Earth within a couple of days following the encounter.

Cassini scientists have a bevy of investigations planned for Dione. Gravity-science data from the flyby will improve scientists’ knowledge of the moon’s internal structure and allow comparisons to Saturn’s other moons.

A view of Saturn's moon Dione captured by NASA's Cassini spacecraft during a close flyby on June 16, 2015. The diagonal line near upper left is the rings of Saturn, in the distance. (NASA/JPL-Caltech/Space Science Institute)

A view of Saturn’s moon Dione captured by NASA’s Cassini spacecraft during a close flyby on June 16, 2015. The diagonal line near upper left is the rings of Saturn, in the distance. (NASA/JPL-Caltech/Space Science Institute)

«Read the rest of this article»


NASA develops Gecko like Grippers for working in Space

 

Written by Elizabeth Landau
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – A piece of tape can only be used a few times before the adhesion wears off and it can no longer hold two surfaces together. But researchers at NASA’s Jet Propulsion Laboratory in Pasadena, California, are working on the ultimate system of stickiness, inspired by geckos.

Thanks to tiny hairs on the bottom of geckos’ feet, these lizards can cling to walls with ease, and their stickiness doesn’t wear off with repeated usage. JPL engineer Aaron Parness and colleagues used that concept to create a material with synthetic hairs that are much thinner than a human hair. When a force is applied to make the tiny hairs bend, that makes the material stick to a desired surface.

This artist's concept shows how a future robot called LEMUR (Limbed Excursion Mechanical Utility Robot) could inspect and maintain installations on the International Space Station. The robot would stick to the outside using a gecko-inspired gripping system. (NASA/JPL-Caltech)

This artist’s concept shows how a future robot called LEMUR (Limbed Excursion Mechanical Utility Robot) could inspect and maintain installations on the International Space Station. The robot would stick to the outside using a gecko-inspired gripping system. (NASA/JPL-Caltech)

«Read the rest of this article»




Page 2 of 13612345...»

Personal Controls

Archives

    September 2015
    S M T W T F S
    « Aug    
     12345
    6789101112
    13141516171819
    20212223242526
    27282930