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The size and age of the universe, as well as how fast it is expanding, has been confirmed with a new, precise method that uses galaxies as lenses to look at other galaxies. The new measurement confirmed the age of the universe as 13.75 billion years old, to within 170 million years, and also confirmed the strength of dark energy , which is responsible for the accelerating expansion of the universe. When looking out at the cosmos, it can be difficult for scientists to distinguish between a very bright light far away and a dimmer source much closer to Earth. To circumvent this problem, a team of researchers used a technique called gravitational lensing to measure the distances light traveled from a bright, active galaxy to the Earth along different paths, along with data from the Hubble Space Telescope. Researchers can use the observations to infer not just how far away the galaxy lies but also the overall scale of the universe and some details of its expansion.
Galactic Lenses Confirm Universe's Age, Size
Un luna en llamas La luna joviana Ío alberga un lago global de roca derretida, bajo una superficie plagada de volcanes. Esa es la conclusión del nuevo análisis de los datos que hace una década obtuvo la sonda Galileo. Gagarin, 50 años después.
Astroseti : Astronomía, Astrobiología, Astronautica y SETI
Universe Today
SpaceX Dragon approaches the ISS on COTS 2 test flight slated for May 19 liftoff and docking on Day 4. Astronauts will grapple it with the robotic arm and berth it at the Earth facing port of the Harmony node. Illustration: NASA /SpaceX In less than 48 hours, SpaceX is primed to make history and launch the first ever commercial rocket and spacecraft to the International Space Station (ISS) early Saturday morning on May 19. Following today’s Launch Readiness Review (LRR), SpaceX was just given the official “GO” from NASA to proceed with the blastoff of the Falcon 9 at 4:55 a.m. EDT (0855 GMT) from Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida.
Microscopic light beams that turns corners could make curving incisions in the body and improve the way microscopic components are carved and transported The clock's tick traversed an optical fibre 900 km long, paving the way for a network of synched clocks that could test Einstein's theory of gravity The multiverse-delving potential of quantum computing could become possible with a device that welds two existing technologies using the power of sound A simulation of the Nobel-prizewinning decay of a kaon into two pions could help explain why the universe contains so much more matter than antimatter Stephen Hawking at 70
Compelling Coverage of Physics And Math from New Scientist - New
Astrophysics News
In two comprehensive studies of SN 2011fe -- the closest Type Ia supernova in the past two decades -- there is new evidence that indicates that the white dwarf progenitor was a ... > full story While scientists believe conditions suitable for life might exist on the so-called "super-Earth" in the Gliese 581 system, it's unlikely to be transferred to other plan ... > full story The first observation of a cosmic effect theorized 40 years ago could provide astronomers with a more precise tool for ... > full story In a challenge to current astrophysical models of the universe, researchers have found that current estimates of the interiors of ... > full story March 19, 2012 — Space scientists report they have quantified levels of radiation on the moon's surface from galactic cosmic ray (GCR) bombardment that over time causes chemical changes in water ice and can create ... > full story
science::.. The Astrophysical Journal
The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics. Many of the classic discoveries of the twentieth century have first been reported in the Journal. On October 14, 2010 The Astrophysical Journal migrated all active manuscripts from the IOP peer review system to eJournalPress. If you are having difficulty accessing your manuscript or sending in a review, please mail the editorial office. Submit an article
Article References Full text PDF (2.21 MB) View as HTML We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z ≤ 0.62. The luminosity distances of these objects are determined by methods that employ relations between SN Ia luminosity and light curve shape. Combined with previous data from our High- z Supernova Search Team and recent results by Riess et al., this expanded set of 16 high-redshift supernovae and a set of 34 nearby supernovae are used to place constraints on the following cosmological parameters: the Hubble constant ( H 0 ), the mass density (Ω M ), the cosmological constant (i.e., the vacuum energy density, Ω Λ ), the deceleration parameter ( q 0 ), and the dynamical age of the universe ( t 0 ). The distances of the high-redshift SNe Ia are, on average, 10%–15% farther than expected in a low mass density (Ω M = 0.2) universe without a cosmological constant.
science::.. The Astronomical Journal
Physics - spotlighting exceptional research
Experimental models of astrophysical and planetary dynamos have been studied in the laboratory and generate magnetic fields with new geometries.
Physical Review Letters
To promote reading across fields, the editors of Physical Review Letters offer "Suggestions" each week of papers that they hope will lead readers to explore other areas of physics. Please see our Announcement PRL 98, 010001 (2007) . J.
One of the most delightful, witty, and beautifully written of all natural histories, The Voyage of the Beagle recounts the young Darwin's 1831 to 1836 trip to South America, the Galápagos Islands, Australia, and back again to England, a journey that transformed his understanding of biology and fed the development of his ideas about evolution. Fossils spring to life on the page as Darwin describes his adventures, which include encounters with "savages" in Tierra del Fuego, an accidental meal of a rare bird in Patagonia (which was then named in Darwin's honor), and wobbly attempts to ride Galápagos tortoises. advertisement | article continues below