搜索结果: 1-15 共查到“天文学 Years”相关记录26条 . 查询时间(0.116 秒)
What seemed a cosmic trickle almost a decade ago now appears as a rapid-fire barrage from across the universe.
New delta Scuti:Rare pulsating star 7,000 light years away is 1 of only 7 in Milky Way
New delta Scuti pulsating star 7,000 light years 1 of only 7 Milky Way
2017/3/13
The star is one that pulsates and so is characterized by varying brightness over time. It’s situated 7,000 light years away from the Earth in the constellation Pegasus, said astronomer Farley Fer...
Nearby massive star explosion 30 million years ago equaled detonation of 100 million suns
massive star explosion 30 million years ago detonation of 100 million suns
2016/5/6
A giant star that exploded 30 million years ago in a galaxy near Earth had a radius prior to going supernova that was 200 times larger than our sun, according to astrophysicists at Southern Methodist ...
Dust grains could be remnants of stellar explosions billions of years ago
Dust grains remnants stellar explosions billions
2016/3/21
Microscopic dust particles have been found in meteoritic material on Earth, particles that were likely formed in stellar explosions that occurred long before the creation of our star, the sun.Whether ...
Dust grains could be remnants of stellar explosions billions of years ago
Dust grains stellar explosions billions
2016/3/14
Microscopic dust particles have been found in meteoritic material on Earth, particles that were likely formed in stellar explosions that occurred long before the creation of our star, the sun.Whether ...
The intergalactic medium over the last 10 billion years I: Lyman alpha absorption and physical conditions
intergalactic medium hydrodynamic
2014/12/20
The intergalactic medium (IGM) is the dominant reservoir of baryons at all cosmic epochs. We investigate the evolution of the IGM from z=2-0 in 48 Mpc/h, 110-million particle cosmological hydrodynamic...
PSR J0007+7303 in the CTA1 SNR: New Gamma-ray Results from Two Years of Fermi-LAT Observations
CTA1 SNR:Gamma-ray Results Fermi-LAT Observations
2011/10/12
One of the main results of the Fermi Gamma-Ray Space Telescope is the discovery of {\gamma}-ray selected pulsars. The high magnetic field pulsar, PSR J0007+7303 in CTA1, was the first ever to be disco...
The Last Eight-Billion Years of Intergalactic SiIV Evolution
intergalactic medium – quasars absorption lines techniques spectroscopic intergalactic medium quasars absorption lines techniques spectroscopic
2010/11/10
We identified 24 Si IV absorption systems with z . 1 from a blind survey of 49 low-redshift
quasars with archival Hubble Space Telescope ultraviolet spectra. We relied solely on the char-
acteristic...
Six years of XMM-Newton observations of NGC 1313 X-1 and X-2
accretion accretion disks – X-rays binaries – X-Rays galaxies – X-rays individuals (NGC 1313 X-2)
2010/11/12
We present a systematic analysis of the X-ray spectra of NGC 1313 X-1 and NGC 1313 X-2, using six years of XMMNewton observations (17 observations).We fitted the continuum with a Comptonization model ...
Extreme conditions in natural flows are examined, starting with a turbulent big bang.A hydro-gravitational-dynamics cosmology model is adopted. Planck-Kerr turbulence instability causes Planck-particl...
Time-variability in the Interstellar Boundary Conditions of the Heliosphere over the past 60,000 years: Impact of the Solar Journey on the Galactic Cosmic Ray Flux at Earth
Time-variability the Interstellar Boundary Conditions
2011/1/10
During the solar journey through galactic space, variations in the physical properties of the surrounding interstellar material (ISM) modify the heliosphere and modulate the flux of galactic cosmic ra...
Three years of experience with the STELLA robotic observatory
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2011/1/6
Since May 2006, the two STELLA robotic telescopes at the Izana observatory in Tenerife, Spain, delivered an almost uninterrupted stream of scientific data. To achieve such a high level of autonomous o...
Microlensing as a probe of the Galactic structure; 20 years of microlensing optical depth studies
microlensing dark matter Galactic structure
2010/3/19
Microlensing is now a very popular observational astronomical technique. The investigations accessible through this effect range from the dark matter problem to the search for extra-solar planets. In ...
DEEP after 15 years：lessons for GTC
DEEP GTC
2009/6/30
DEEP after 15 years：lessons for GTC。
Astroengineering, or how to save the Earth in only one billion years
Astroengineering the Earth
2009/6/16
Astroengineering, or how to save the Earth in only one billion years。