Tag Archives: gravity waves

LIGO Detects a Neutron Star Merger

New LIGO discovery is an astronomer’s dream come true.

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On August 17, astronomers detected gravitational waves and a gamma-ray burst from two colliding neutron stars. National Science Foundation/LIGO/Sonoma State University/A. Simonnet

On August 17, Mother Nature delivered a gift to astronomers as precious as anything they could have imagined: gravitational waves from two neutron stars spiraling inward and merging, followed moments later by a burst of gamma rays from the same patch of sky. This cosmic double whammy was officially announced today after nearly two months of rumors. It proves a long-standing theory for an enigmatic class of cosmic cataclysms while heralding a revolutionary new era of multi-messenger astronomy.

The sequence of events started at 8:41 a.m. Eastern time when a train of gravitational waves started rolling through the Virgo detector near Pisa, Italy. The same waves rumbled through the LIGO detector in Livingston, Louisiana, just 22 milliseconds later, then the twin LIGO detector in Hanford, Washington, 3 milliseconds after that.

The LIGO and Virgo instruments detected a crescendo of waves for a whopping 100 seconds — much longer than previous detections. The duration, amplitude, and frequency of the waves had all the characteristics that theorists have expected for a binary system consisting of two neutron stars on a death spiral ending with coalescence. The two neutron stars had masses of about 1.5 and 1.1 solar masses, respectively. About 1 to 2 percent of that mass was likely ejected into space during the merger, which presumably resulted in a black hole of nearly 3 solar masses, although the LIGO data does not prove that a black hole formed. If a black hole indeed formed, it’s the lightest black hole yet known.

Very long range sensors detect…

  • A wrinkle in time: Gravity Waves prove Einstein right!
  • Water on Pluto
  • The sky this week-naked eye observing
  • Blast from black hole in a galaxy far, far away
  • Antarctic fungi survive martian conditions on ISS

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BHsim-600Gravity Waves Detected:  LIGO scientists have announced the direct detection of gravitational waves, a discovery that won’t just open a new window on the cosmos — it’ll smash the door wide open. Read more in Sky and Telescope, lots of pictures, graphs, diagrams….Also read more from Astronomy Magazine, though I found the format of the page rather strange.

Water on Pluto: Data from NASA’s New Horizons spacecraft point to more prevalent water ice on Pluto’s surface than previously thought.  Read More from Astronomy Magazine

The sky this week:  Check out the winter constellations, most of the observations mentioned in this article are visible to the naked eye. The winter hexagon is easily picked, even in light polluted skies of Montreal.  From Sky and Tel.  Printable star chart for February can be found here.

Blast from black hole in a galaxy far, far away:  The Pictor A Galaxy contains a supermassive black hole at its center, and a huge amount of gravitational energy is released as material swirls toward the event horizon. From Astronomy Magazine, read more.

Antarctic fungi survive martian conditions on ISS: Antarctica’s McMurdo Dry Valleys are the most Mars-like place on Earth. They make up one of the driest and most hostile environments on our planet, where strong winds scour away even snow and ice.  Read about ISS experiment.