Topic: Radio Waves

American Heart Association reports Radio waves to kidneys lower persistent high blood pressure

December 20, 2012 |

A minimally invasive procedure lowered blood pressure in patients whose condition failed to respond to medication.

Dallas, TX – Directing short bursts of radio waves at nerves surrounding the kidneys lowered blood pressure for at least six months and up to one year among patients with hypertension External link that persists regardless of taking multiple medications to control it, according to a new study published in the American Heart Association journal, Circulation.

The findings could have significant public health implications in the treatment of resistant hypertension, a major risk factor for heart attack and stroke, said Murray Esler, M.B.B.S., Ph.D., Professor and Senior Director of the Baker IDI Heart and Diabetes Institute in Melbourne, Australia. «Read the rest of this article»

Herschel Space Observatory looks into the Dark Heart of a Cosmic Collision

April 9, 2012 |

Written by Whitney Clavin
NASA’s Jet Propulsion Laboratory

Pasadena, CA – Infrared and X-ray observations from two space telescopes have been combined to create a unique look at violent events within the giant galaxy Centaurus A. The observations strengthen the view that the galaxy may have been created by the cataclysmic collision of two older galaxies.

The infrared light was captured by the European Space Agency’s Herschel Space Observatory, a mission with important NASA contributions. The X-ray observations were made by the European Space Agency’s XMM-Newton space telescope.

The peculiar galaxy Centaurus A as seen in longer infrared wavelengths and X-rays. Inner structural features seen in this image are helping scientists to understand the mechanisms and interactions within the galaxy, as are the jets seen extending over thousands of light years from the black hole believed to be at its heart. (Credits: Far-infrared: ESA/Herschel/PACS/SPIRE/C.D. Wilson, MacMaster University, Canada; X-ray: ESA/XMM-Newton/EPIC)

«Read the rest of this article»

NASA’s Fermi Gamma-ray Space Telescope is finding Mysterious Objects at the Edge of the Electromagnetic Spectrum

March 17, 2012 |

Written by Dauna Coulter
Science at NASA

Washington, D.C. – The human eye is crucial to astronomy. Without the ability to see, the luminous universe of stars, planets and galaxies would be closed to us, unknown forever. Nevertheless, astronomers cannot shake their fascination with the invisible.

Outside the realm of human vision is an entire electromagnetic spectrum of wonders. Each type of light–­from radio waves to gamma-rays–reveals something unique about the universe. Some wavelengths are best for studying black holes; others reveal newborn stars and planets; while others illuminate the earliest years of cosmic history.

«Read the rest of this article»

NASA explains Storms from the Sun and their effects on Earth

March 10, 2012 |

Written by Karen C. Fox
NASA’s Goddard Space Flight Center

Greenbelt, MD – Space weather starts at the sun. It begins with an eruption such as a huge burst of light and radiation called a solar flare or a gigantic cloud of solar material called a coronal mass ejection (CME). But the effects of those eruptions happen at Earth, or at least near-Earth space.

Scientists monitor several kinds of space “weather” events — geomagnetic storms, solar radiation storms, and radio blackouts – all caused by these immense explosions on the sun.

Artist illustration of events on the sun changing the conditions in Near-Earth space. (Credit: NASA)

«Read the rest of this article»

NASA’s WISE Mission Captures Black Hole’s Wildly Flaring Jet

September 22, 2011 |

Whitney Clavin,
Jet Propulsion Laboratory

Pasadena, CA – Astronomers using NASA’s Wide-field Infrared Survey Explorer (WISE) have captured rare data of a flaring black hole, revealing new details about these powerful objects and their blazing jets.

Scientists study jets to learn more about the extreme environments around black holes. Much has been learned about the material feeding black holes, called accretion disks, and the jets themselves, through studies using X-rays, gamma rays and radio waves. But key measurements of the brightest part of the jets, located at their bases, have been difficult despite decades of work. WISE is offering a new window into this missing link through its infrared observations.

This artist's concept illustrates what the flaring black hole called GX 339-4 might look like. Infrared observations from NASA's Wide-field Infrared Survey Explorer (WISE) reveal the best information yet on the chaotic and extreme environments of this black hole's jets. (Image credit: NASA)

«Read the rest of this article»

© 2006-2010 Clarksville, TN Online is owned and operated by residents of Clarksville Tennessee.
» We are Hosted by Compu-Net Enterprises; In Partnership with Discover Clarksville and Discover Paris