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|Astronomy News -- ScienceDaily|
Updated : Fri, 09 Oct 2015 15:40:37 EDT
Mysterious ripples found racing through planet-forming disc
Astronomers have discovered never-before-seen structures within a dusty disc surrounding a nearby star. The fast-moving wave-like features in the disc of the star AU Microscopii are unlike anything ever observed, or even predicted, before now. The origin and nature of these features present a new mystery for astronomers to explore.
Publ.Date : Wed, 07 Oct 2015 13:56:53 EDT
Where to look for life? Astronomers devise 'habitability index' to guide future search
Astronomers have created a way to compare and rank exoplanets to help prioritize which of the thousands discovered warrant close inspection in the search for life beyond Earth.
Publ.Date : Mon, 05 Oct 2015 18:46:38 EDT
The golden anniversary of black-hole singularity
When a star collapses forming a black hole, a space-time singularity is created wherein the laws of Physics no longer work. In 1965 Sir Roger Penrose presented a theorem where he associated that singularity with so-called 'trapped surfaces' that shrink over time. That hypothesis -- one of the results of the general theory of relativity -- is now celebrating its anniversary.
Publ.Date : Thu, 01 Oct 2015 12:58:46 EDT
High-powered telescope designed to explore origins of universe moving toward 'first light'
An effort to peer into the origins of the universe with the most effective instrument ever used in the effort is taking a big step forward, as scientists begin shipping a two-story-tall microwave telescope to its base in Chile.
Publ.Date : Wed, 30 Sep 2015 15:01:23 EDT
Asteroids found to be the moon's main 'water supply'
Water reserves found on the moon are the result of asteroids acting as 'delivery vehicles' and not of falling comets as was previously thought. Using computer simulation, scientists have discovered that a large asteroid can deliver more water to the lunar surface than the cumulative fall of comets over a billion year period.
Publ.Date : Wed, 30 Sep 2015 11:04:27 EDT
Dawn team shares new maps and insights about Ceres
Mysteries and insights about Ceres are being discussed this week at the European Planetary Science Conference in Nantes, France. NASA's Dawn spacecraft is providing scientists with tantalizing views and other data about the intriguing dwarf planet that they continue to analyze.
Publ.Date : Wed, 30 Sep 2015 10:45:37 EDT
Mechanism of explosions and plasma jets associated with sunspot formation revealed
Sunspots are planet-sized conglomerates of bundles of intense magnetic field lines on the surface of the Sun. They are known to cause explosions (solar flares) which can directly impact our technological infrastructure. What astrophysical mechanisms are responsible for the formation of sunspots and how do they drive explosive events are important questions in our quest to understand the Sun's activity and its magnetic effect on Earth.
Publ.Date : Wed, 30 Sep 2015 07:44:31 EDT
Walk the line: NASA studies physical performance after spaceflight
Walking an obstacle course on Earth is relatively easy. Walking an obstacle course after being in space for six months isn't so simple. NASA's Human Research Program is focusing on identifying key physical factors that contribute to a decrease in performance as we prepare for a journey to Mars.
Publ.Date : Tue, 29 Sep 2015 18:12:27 EDT
Earth-like planets around small stars likely have protective magnetic fields, aiding chance for life
Earth-like planets orbiting close to small stars probably have magnetic fields that protect them from stellar radiation and help maintain surface conditions that could be conducive to life, according to research from astronomers.
Publ.Date : Tue, 29 Sep 2015 07:07:03 EDT
Liquid water flows on today's Mars: NASA confirms evidence
New findings from NASA's Mars Reconnaissance Orbiter (MRO) provide the strongest evidence yet that liquid water flows intermittently on present-day Mars. Using an imaging spectrometer on MRO, researchers detected signatures of hydrated minerals on slopes where mysterious streaks are seen on the Red Planet. These darkish streaks appear to ebb and flow over time.
Publ.Date : Mon, 28 Sep 2015 09:41:14 EDT
Rosetta’s mass spectrometer ROSINA detected argon at comet Churyumov-Gerasimenko
The mass spectrometer ROSINA on ESA’s comet probe Rosetta has for the first time detected the noble gas argon in the coma of 67P/Churyumov-Gerasimenko. This measurement adds to the debate about the role of comets in delivering various ingredients to Earth such as water.
Publ.Date : Sat, 26 Sep 2015 22:06:38 EDT
'Fossils' of galaxies reveal the formation and evolution of massive galaxies
Astronomers have observed massive dead galaxies in the universe 4 billion years after the Big Bang. They discovered that the stellar content of these galaxies is strikingly similar to that of massive elliptical galaxies seen locally. Furthermore, they identified progenitors of these dead galaxies when they were forming stars at an earlier cosmic epoch, unveiling the formation and evolution of massive galaxies across 11 billion years of cosmic time.
Publ.Date : Fri, 25 Sep 2015 08:55:46 EDT
Eleven-year cosmic search leads to black hole rethink
One hundred years since Einstein proposed gravitational waves as part of his general theory of relativity, an 11-year search has failed to detect them, casting doubt on our understanding of galaxies and black holes.
Publ.Date : Thu, 24 Sep 2015 15:15:16 EDT
Shrapnel from an exploded star
Astronomers are comparing new images of the Veil Nebula, taken by NASA's Hubble Space Telescope in April 2015 with Hubble images taken in 1997, to study how the nebula has expanded since it was photographed over 18 years ago. The supernova that created the Veil Nebula would have been briefly visible to our very distant ancestors thousands of years ago as a bright "new star" in the northern sky.
Publ.Date : Thu, 24 Sep 2015 10:44:20 EDT
Too big for its boots: Black hole is 30 times expected size
The central supermassive black hole of a recently discovered galaxy has been found to be far larger than should be possible, according to current theories of galactic evolution. New work shows that the black hole is much more massive than it should be, compared to the mass of the galaxy around it.
Publ.Date : Thu, 24 Sep 2015 08:36:34 EDT
Discovery of potential gravitational lenses shows citizen science value
Citizen scientists have helped an international team of researchers to discover 29 new gravitational lens candidates in galaxies far away.
Publ.Date : Thu, 24 Sep 2015 08:36:26 EDT
Total lunar eclipse will bring big red Moon to early morning sky
People across the western hemisphere may be surprised to see a rust-colored Moon in the sky on 28 September. Early that morning (the evening of the 27 September for observers in North and South America) will be this year's second total eclipse of the Moon. From the UK, this will be the first total lunar eclipse visible since 2008, and the last one visible in its entirety until 2019.
Publ.Date : Wed, 23 Sep 2015 10:34:05 EDT
Hot, dense material surrounds O-type star with largest magnetic field known
Observations revealed that the unusually large magnetosphere around an O-type star called NGC 1624-2 contains a raging storm of extreme stellar winds and dense plasma that gobbles up X-rays before they can escape into space.
Publ.Date : Wed, 23 Sep 2015 08:26:07 EDT
Messier 17: A cosmic rose with many names
This new image of the rose-colored star forming region Messier 17 was captured by the Wide Field Imager on the MPG/ESO 2.2-meter telescope at ESO's La Silla Observatory in Chile. It is one of the sharpest images showing the entire nebula and not only reveals its full size but also retains fine detail throughout the cosmic landscape of gas clouds, dust and newborn stars.
Publ.Date : Wed, 23 Sep 2015 08:25:59 EDT
Radio telescopes could spot stars hidden in the galactic center
The center of our Milky Way galaxy is a mysterious place. Not only is it thousands of light-years away, it's also cloaked in so much dust that most stars within are rendered invisible. Harvard researchers are proposing a new way to clear the fog and spot stars hiding there. They suggest looking for radio waves coming from supersonic stars.
Publ.Date : Tue, 22 Sep 2015 11:58:21 EDT