Posted on Jul 14, 2021

APOD: 2021 July 14 - GW200115: Simulation of a Black Hole Merging with a Neutron Star

Maj William W. 'Bill' Price

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Good morning, Rallypoint. Today's Astronomy Picture of the Day (APOD) video clip is titled "GW200115: Simulation of a Black Hole Merging with a Neutron Star." Did you know there were now three laser interferometer gravitational-wave observatories on line? I didn't either. LIGO is in the US and Virgo is in Europe. The third, KAGRA, is in Japan. GW200115 (a merger between a black hole and a neutron star) was detected by all three on January 15, 2020, and results were just recently published. When two massive objects (like a black hole and a neutron star) merge, energy is released in the form of gravitational radiation. Albert Einstein predicted this in his General Theory of Relativity. And this video is based on the data gathered by the three gravitational wave observatories.

The physics involved in all of this is both mind-numbing and fascinating at the same time. But it allows us to contemplate creation in a manner that usually cannot be seen. I encourage you to spend a little search time reading about gravitational waves, their detection, and what they tell us about the Universe. But in the meantime, enjoy the video clip.

APOD: 2021 July 14 - GW200115: Simulation of a Black Hole Merging with a Neutron Star

Posted from apod.nasa.gov

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LTC Stephen F.

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Posted 3 y ago

Norah Jones – Black Hole Sun (Detroit Fox Theatre 5.23.17)

Norah paid tribute to Chris Cornell at Detroit’s Fox Theatre with ‘Black Hole Sun.’ Filmed by: Ed Davis

Belated thank you my friend Maj William W. 'Bill' Price for posting the NASA Astronomy Video Clip of the Day (AVCOD) entitled "GW200115: Simulation of a Black Hole Merging with a Neutron Star."

Images:
1. MAYA collaboration numerical relativity simulation of a neutron star-black hole binary merger
2. An artistic image inspired by a black hole-neutron star merger event
3. Black Hole-neutron star mergers could resolve Hubble constant conflict

AVCOD background
"Explanation: What happens when a black hole destroys a neutron star? Analyses indicate that just such an event created gravitational wave event GW200115, detected in 2020 January by LIGO and Virgo observatories. To better understand the unusual event, the featured visualization was created from a computer simulation. The visualization video starts with the black hole (about 6 times the Sun's mass) and neutron star (about 1.5 times the Sun's mass) circling each other, together emitting an increasing amount of gravitational radiation. The picturesque pattern of gravitational wave emission is shown in blue. The duo spiral together increasingly fast until the neutron star becomes completely absorbed by the black hole. Since the neutron star did not break apart during the collision, little light escaped -- which matches the lack of an observed optical counterpart. The remaining black hole rings briefly, and as that dies down so do the emitted gravitational waves. The 30-second time-lapse video may seem short, but it actually lasts about 1000 times longer than the real merger event."

Norah Jones – Black Hole Sun (Detroit Fox Theatre 5.23.17)
https://www.youtube.com/watch?v=XbQ08Ixczvo
FYI COL Mikel J. Burroughs SMSgt Lawrence McCarter LTC (Join to see) MAJ Dale E. Wilson, Ph.D. Maj Bill Smith, Ph.D. Sgt Albert Castro PO1 William "Chip" Nagel SSG Samuel Kermon SSG Franklin Briant A1C Riley Sanders GySgt Thomas Vick CPL Douglas Chrysler SP5 Geoffrey Vannerson Lt Col John (Jack) Christensen GySgt Jack Wallace 1SG Steven Imerman MSgt James Clark-Rosa SGT (Join to see) Maj Marty Hogan

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LTC Stephen F.

3 y

Chris Cornell - Black Hole Sun Acoustic

April 22 on CBS in a segment called "Saturday sessions". Idk why they took it down but here it is. rip chris.

Chris Cornell - Black Hole Sun Acoustic
April 22 on CBS in a segment called "Saturday sessions". Idk why they took it down but here it is. rip chris.
https://www.youtube.com/watch?v=zt_9h4i0Lw8
FYI CSM Charles Hayden~1121300:SPC Woody Bullard] Cpl (Join to see) SFC William Farrell SPC Michael Terrell SSG Paul Headlee SPC Michael Duricko, Ph.D SPC Randy Zimmerman Cpl Vic Burk PO1 H Gene Lawrence Maj William W. 'Bill' Price PO2 (Join to see) LTC John Shaw MSG Andrew White SGT Steve McFarland 1LT Voyle Smith SPC Nancy GreeneSPC Steve Irvine SGT (Join to see)LTC Ken Connolly

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LTC Stephen F.

3 y

Craig Connelly & Christina Novelli - Black Hole [Official Music Video]

NEW SONG! Ashley Wallbridge’s hotly anticipated #StillAlive single just landed, check out the full lyric video here: https://www.youtube.com/watch?v=vSn50qWJ...