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|Astronomy News -- ScienceDaily|
Updated : Wed, 16 Aug 2017 08:48:43 EDT
Cassini says goodbye to a true Titan
Mere weeks away from its dramatic, mission-ending plunge into Saturn, NASA's Cassini spacecraft has a hectic schedule, orbiting the planet every week in its Grand Finale. On a few orbits, Saturn's largest moon, Titan, has been near enough to tweak Cassini's orbit, causing the spacecraft to approach Saturn a bit closer or a bit farther away. A couple of those distant passes even pushed Cassini into the inner fringes of Saturn's rings.
Publ.Date : Tue, 15 Aug 2017 15:02:05 EDT
Cosmic magnifying lens reveals inner jets of black holes
Jet material ejected from a black hole is magnified in new observations from Caltech's Owens Valley Radio Observatory. This discovery provides the best view yet of blobs of hot gas that shoot out from supermassive black holes.
Publ.Date : Tue, 15 Aug 2017 13:38:49 EDT
Tracking a solar eruption through the solar system
Ten spacecraft, from ESA's Venus Express to NASA's Voyager-2, felt the effect of a solar eruption as it washed through the solar system while three other satellites watched, providing a unique perspective on this space weather event.
Publ.Date : Tue, 15 Aug 2017 12:04:38 EDT
Cosmic velocity web: Motions of thousands of galaxies mapped
The cosmic web -- the distribution of matter on the largest scales in the universe -- has usually been defined through the distribution of galaxies. Now, a new study by a team of astronomers demonstrates a novel approach. Instead of using galaxy positions, they mapped the motions of thousands of galaxies.
Publ.Date : Tue, 15 Aug 2017 09:51:32 EDT
Tidally locked exoplanets may be more common than previously thought
Many exoplanets to be found by coming high-powered telescopes will probably be tidally locked -- with one side permanently facing their host star -- according to new research.
Publ.Date : Mon, 14 Aug 2017 16:19:52 EDT
Supernova collides with nearby star, taking astrophysicists by surprise
In the 2009 film 'Star Trek,' a supernova hurtles through space and obliterates a planet unfortunate enough to be in its path. Fiction, of course, but it turns out the notion is not so farfetched.
Publ.Date : Mon, 14 Aug 2017 13:48:14 EDT
Studying the Sun's atmosphere with the total solar eclipse of 2017
A total solar eclipse happens somewhere on Earth about once every 18 months. But because Earth's surface is mostly ocean, most eclipses are visible over land for only a short time, if at all. The total solar eclipse of Aug. 21, 2017, is different -- its path stretches over land for nearly 90 minutes, giving scientists an unprecedented opportunity to make scientific measurements from the ground.
Publ.Date : Mon, 14 Aug 2017 12:53:43 EDT
New 3-D simulations show how galactic centers cool their jets
Scientists have developed new theories and 3-D simulations to explain what's at work in the mysterious jets of energy and matter beaming from the center of galaxies at nearly the speed of light.
Publ.Date : Mon, 14 Aug 2017 12:09:22 EDT
Cassini to begin final five orbits around Saturn
NASA's Cassini spacecraft will enter new territory in its final mission phase, the Grand Finale, as it prepares to embark on a set of ultra-close passes through Saturn's upper atmosphere with its final five orbits around the planet.
Publ.Date : Sat, 12 Aug 2017 12:15:16 EDT
New mission going to the space station to explore mysteries of 'cosmic rain'
A new experiment set for launch to the International Space Station will provide an unprecedented look at a rain of particles from deep space, called cosmic rays, that constantly showers our planet. The mission is designed to measure the highest-energy particles of any detector yet flown in space.
Publ.Date : Fri, 11 Aug 2017 13:49:34 EDT
NASA watches the Sun put a stop to its own eruption
On Sept. 30, 2014, multiple NASA observatories watched a failed solar eruption. Because scientists had so many eyes on the event, they were able to explain how the Sun's magnetic landscape shredded its own eruption.
Publ.Date : Fri, 11 Aug 2017 12:48:17 EDT
Galactic winds push researchers to probe galaxies at unprecedented scale
After using the Titan supercomputer at Oak Ridge National Laboratory to rule out a potential mechanism for galactic wind, astrophysicists are aiming to generate nearly a trillion-cell simulation of an entire galaxy, which would be the largest simulation of a galaxy ever.
Publ.Date : Thu, 10 Aug 2017 17:33:41 EDT
Day to night and back again: Earth's ionosphere during the total solar eclipse
Three NASA-funded studies will use the Aug. 21 total solar eclipse as a ready-made experiment, courtesy of nature, to improve our understanding of the ionosphere and its relationship to the Sun.
Publ.Date : Thu, 10 Aug 2017 14:57:07 EDT
New observations of Crab Nebula and Pulsar reveal polarized emissions
New observations of polarised X-rays from the Crab Nebula and Pulsar may help explain sudden flares in the Crab’s X-ray intensity, as well as provide new data for modeling – and understanding – the nebula.
Publ.Date : Thu, 10 Aug 2017 08:21:53 EDT
Chaco Canyon petroglyph may represent ancient total eclipse
As the hullabaloo surrounding the Aug. 21 total eclipse of the sun swells by the day, an expert says a petroglyph in New Mexico's Chaco Canyon may represent a total eclipse that occurred there a thousand years ago.
Publ.Date : Wed, 09 Aug 2017 14:01:52 EDT
Black holes pervade the universe, celestial census indicates
After conducting a cosmic inventory of sorts to calculate and categorize stellar-remnant black holes, astronomers have concluded that there are probably tens of millions of the enigmatic, dark objects in the Milky Way -- far more than expected.
Publ.Date : Mon, 07 Aug 2017 15:54:03 EDT
Astronauts to bring asteroid back into lunar orbit
Future space exploration aims to fly further from Earth than ever before. New research examines the robotic phase of the Asteroid Redirect Mission (ARM). In addition to taking manned spaceflights deeper into space than ever before, the proposed mission would also bring some benefit for planetary science.
Publ.Date : Mon, 07 Aug 2017 11:03:41 EDT
Primordial black holes may have helped to forge heavy elements
Astronomers like to say we are the byproducts of stars, stellar furnaces that long ago fused hydrogen and helium into the elements needed for life through the process of stellar nucleosynthesis. But what about the heavier elements in the periodic chart, elements such as gold, platinum and uranium? Astronomers believe most of these "r-process elements" -- elements much heavier than iron -- were created, either in the aftermath of the collapse of massive stars and the associated supernova explosions, or in the merging of binary neutron star systems.
Publ.Date : Fri, 04 Aug 2017 13:18:16 EDT
Twilight observations reveal huge storm on Neptune
Striking images of a storm system nearly the size of Earth have astronomers doing a double-take after pinpointing its location near Neptune's equator, a region where no bright cloud has been seen before. The discovery was made at dawn on June 26 as researchers were testing the Keck telescope to see whether it could make useful observations during twilight, a time most astronomers consider unusable because it's not dark enough.
Publ.Date : Thu, 03 Aug 2017 15:22:39 EDT
Dark Energy Survey reveals most accurate measurement of universe's dark matter
Dark Energy Survey scientists have unveiled the most accurate measurement ever made of the present large-scale structure of the universe. These measurements of the amount and 'clumpiness' (or distribution) of dark matter in the present-day cosmos were made with a precision that, for the first time, rivals that of inferences from the early universe by the European Space Agency's orbiting Planck observatory.
Publ.Date : Thu, 03 Aug 2017 12:06:20 EDT