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Recent Articles
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Topic: Pulsars
Since astronomers captured the bright explosion of a star on February 24th, 1987, researchers have been searching for the squashed stellar core that should have been left behind. A group of astronomers using data from NASA space missions and ground-based telescopes may have finally found it. ![]() Supernova 1987A exploded more than 30 years ago and is still surrounded by debris. The energetic environment has been imaged by NASA’s Nuclear Spectroscopic Telescope Array, or NuSTAR (shown in blue) and the Chandra X-ray Observatory (shown in red), which has finer resolution. (NASA/CXC) «Read the rest of this article» Sections: Technology | No Comments
NASA’s NICER telescope records sudden spike of X-Rays
The X-ray burst, the brightest seen by NICER so far, came from an object named SAX J1808.4-3658, or J1808 for short. The observations reveal many phenomena that have never been seen together in a single burst. In addition, the subsiding fireball briefly brightened again for reasons astronomers cannot yet explain. ![]() Illustration depicting a Type I X-ray burst. The explosion first blows off the hydrogen layer, which expands and ultimately dissipates. Then rising radiation builds to the point where it blows off the helium layer, which overtakes the expanding hydrogen. Some of the X-rays emitted in the blast scatter off of the accretion disk. The fireball then quickly cools, and the helium settles back onto the surface. (NASA’s Goddard Space Flight Center/Chris Smith (USRA)) «Read the rest of this article» Sections: Technology | No Comments
NASA’s Fermi Gamma-ray Space Telescope team creates set of new ConstellationsWritten by Francis Reddy
The new constellations include a few characters from modern myths. Among them are the Little Prince, the time-warping TARDIS from “Doctor Who,” Godzilla and his heat ray, the antimatter-powered U.S.S. Enterprise from “Star Trek: The Original Series” and the Hulk, the product of a gamma-ray experiment gone awry. ![]() New, unofficial constellations appear in this image of the sky mapped by NASA’s Fermi Gamma-ray Space Telescope. Fermi scientists devised the constellations to highlight the mission’s 10th year of operations. Fermi has mapped about 3,000 gamma-ray sources — 10 times the number known before its launch and comparable to the number of bright stars in the traditional constellations. (NASA) «Read the rest of this article» Sections: Technology | No Comments
NASA Scientists use “Pulsar in a Box” to gain better understanding of Neutron StarsWritten by Francis Reddy
The model traces the paths of charged particles in magnetic and electric fields near the neutron star, revealing behaviors that may help explain how pulsars emit gamma-ray and radio pulses with ultraprecise timing. ![]() Electrons (blue) and positrons (red) from a computer-simulated pulsar. These particles become accerlated to extreme energies in a pulsar’s powerful magnetic and electric fields; lighter tracks show particles with higher energies. Each particle seen here actually represents trillions of electrons or positrons. (NASA’s Goddard Space Flight Center) «Read the rest of this article» Sections: Technology | No Comments
NASA uses Pulsars to detect Gravitational WavesWritten by Elizabeth Landau
So far, there have been five detections of gravitational waves, thanks to the Laser Interferometer Gravitational-Wave Observatory (LIGO) and, more recently, the European Virgo gravitational-wave detector. Using these facilities, scientists have been able to pin down the extremely subtle signals from relatively small black holes and, as of October, neutron stars. ![]() This computer simulation shows the collision of two black holes, which produces gravitational waves. (SXS) «Read the rest of this article» Sections: Technology | No Comments
NASA’s Astrophysics Explorers Program to explore Exotic Astronomical ObjectsWritten by Felicia Chou
Objects such as black holes can heat surrounding gases to more than a million degrees. The high-energy X-ray radiation from this gas can be polarized – vibrating in a particular direction. «Read the rest of this article» Sections: Technology | 1 Comment »
NASA reports Radio Telescopes could soon detect Low-Frequency Gravitational WavesWritten by Elizabeth Ferrara
A new study from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has shown that low-frequency gravitational waves could soon be detectable by existing radio telescopes. ![]() Gravitational waves are ripples in space-time, represented by the green grid, produced by accelerating bodies such as interacting supermassive black holes. These waves affect the time it takes for radio signals from pulsars to arrive at Earth. (David Champion) «Read the rest of this article» Sections: Technology | No Comments
NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR) hears the possible sounds of Dead StarsWritten by Whitney Clavin
“We can see a completely new component of the center of our galaxy with NuSTAR’s images,” said Kerstin Perez of Columbia University in New York, lead author of a new report on the findings in the journal Nature. “We can’t definitively explain the X-ray signal yet — it’s a mystery. More work needs to be done.” ![]() NASA’s Nuclear Spectroscopic Telescope Array, or NuSTAR, has captured a new high-energy X-ray view (magenta) of the bustling center of our Milky Way galaxy. (NASA/JPL-Caltech) «Read the rest of this article» Sections: Technology | No Comments
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