Many objects in the universe emit radio waves. In 1931, American physicist Karl Jansky first detected radio static from our own Milky Way galaxy. Similar emission from other galaxies creates a background hiss of radio noise.
Now a team led by Alan Kogut of NASA's Goddard Space Flight Center in Greenbelt, Md., today announced the discovery of cosmic radio noise that booms six times louder than expected.
The finding comes from a balloon-borne instrument named ARCADE, which stands for the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission. In July 2006, the instrument launched from NASA's Columbia Scientific Balloon Facility in Palestine, Texas, and flew to an altitude of 120,000 feet, where the atmosphere thins into the vacuum of space.
In popular legend, Lucrezia Borgia, Duchess of Ferrara (1480- 1519), stands falsely accused of poisoning her second husband. Victor Hugo portrayed her in thinly veiled fiction as a tragic femme fatale. Buffalo Bill named his gun after her.
But new research by USC historian Diane Yvonne Ghirardo claims that the only sister of Machiavelli's Prince was less interested in political intrigue than in running a business, undertaking massive land development projects that "stand alone in the panorama of early sixteenth-century projects, not only those initiated by women," Ghirardo says.
Attention Deficit/Hyperactivity Disorder (ADHD) is a complex condition considered by some to have both environmental and genetic causes. It is characterized by developmentally inappropriate levels of inattention, hyperactivity and impulsivity that has an onset in childhood. It has become one of the most commonly diagnosed psychiatric diseases, diagnosed in up to 8 percent of children worldwide.
Asteroids are hunks of rock that orbit in the outer reaches of space. Scientists have generally assumed that their small size limited the types of rock that could form in their crusts but two newly discovered meteorites have changed that.
The two meteorites were discovered during the Antarctic Search for Meteorites (ANSMET) 2006/2007 field season in a region of the Antarctic ice known as the Graves Nunatak icefield. The light-colored meteorites, designated GRA 06128 and GRA 06129, were immediately recognized as being different from previously known meteorites.
It seems obvious, right? If you are around people who don't think much of you, over time you are more inclined to think less of yourself. That's self esteem.
Looking at yourself in the mirror every morning, you never think to question whether the person you see is actually you but our interaction with others impacts that also, claims a PLoS ONE study by Dr Manos Tsakiris in Department of Psychology at Royal Holloway, University of London. He challenges this common-sense notion about our own self image and says that the image we hold of our own face can actually change through shared experiences with other people's faces.
Herbicide use should increase crop yields, that's the whole point, and herbicides and pesticides do that, given the output in food production that has matched the population increases over the last two centuries. But there may be a problem in how some herbicides impact reproduction and tests may not be accounting for that, says a study in the Journal of Environmental Quality.