Thursday, 30 June 2016

The energy spectrum of particles will help make out black holes

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Scientists have devised a method of distinguishing black holes from compact massive objects that are externally indistinguishable from one another. The method involves studying the energy spectrum of particles moving in the vicinity - in one case it will be continuous and in the other it will be discrete.
via Science Daily
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A bewildering form of sand dune discovered on Mars

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Some of the wind-sculpted sand ripples on Mars are a type not seen on Earth, and their relationship to the thin Martian atmosphere provides new clues about the atmosphere's history.
via Science Daily
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‘Building blocks for life' may originate in space

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Amino acids are the building blocks for life on earth. They may originate in space and reach the earth via comets and meteorites.
via Science Daily
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Hubble captures vivid auroras in Jupiter’s atmosphere

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Astronomers are using the NASA/ESA Hubble Space Telescope to study auroras -- stunning light shows in a planet's atmosphere -- on the poles of the largest planet in the Solar System, Jupiter.
via Science Daily
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Hubble Captures Vivid Auroras in Jupiter's Atmosphere


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Astronomers are using NASA's Hubble Space Telescope to study auroras stunning light shows in a planet's atmosphere on the poles of the largest planet in the solar system, Jupiter. The auroras were photographed during a series of Hubble Space Telescope Imaging Spectrograph far-ultraviolet-light observations taking place as NASA's Juno spacecraft approaches and enters into orbit around Jupiter. The aim of the program is to determine how Jupiter's auroras respond to changing conditions in the solar wind, a stream of charged particles emitted from the sun. Auroras are formed when charged particles in the space surrounding the planet are accelerated to high energies along the planet's magnetic field. When the particles hit the atmosphere near the magnetic poles, they cause it to glow like gases in a fluorescent light fixture. Jupiter's magnetosphere is 20,000 times stronger than Earth's. These observations will reveal how the solar system's largest and most powerful magnetosphere behaves.


via HubbleSite NewsCenter -- Latest News Releases
http://hubblesite.org/newscenter/archive/releases/2016/24/

The New World Atlas of Artificial Sky Brightness

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How far are you from a naturally dark night sky? In increasing steps, this world map (medium | large) shows the effect of artificial night sky brightness on the visual appearance of the night sky. The brightness was modeled using high resolution satellite data and fit to thousands of night sky brightness measurements in recent work. Color-coded levels are compared to the natural sky brightness level for your location. For example, artificial sky brightness levels in yellow alter the natural appearance of the night sky. In red they hide the Milky Way in an artificial luminous fog. The results indicate that the historically common appearance of our galaxy at night is now lost for more than one-third of humanity. That includes 60% of Europeans and almost 80% of North Americans, along with inhabitants of other densely populated, light-polluted regions of planet Earth.
Tomorrow's picture: pixels in space
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Rosetta finale set for 30 September

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Rosetta is set to complete its mission in a controlled descent to the surface of its comet on 30 September.


via ESA Space Science
http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_finale_set_for_30_September

Surface of Mercury arose from deep inside the planet

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Researchers have found that several volcanic deposits on Mercury's surface require mantle melting to have started close to the planet's core-mantle boundary, which lies only 400 km below the planets surface and making it unique in the solar system.
via Science Daily
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