Ninety Gravitational Wave Spectrograms and Counting

Discover the universe! Each day a different image or photograph of our universe is featured, along with a brief explanation written by an astronomer.

December 7th, 2021.
The featured image shows the first 90.
The events of the waves have ever been detected.
Please see the explanation for more detailed information.

There are ninety giltational wave spectrums and counting.
The image was created by Sudarshan Ghonge and Karan Jani.

Loud chirps are broadcast into the universe when two black holes collide. Since the first three observing runs, we have heard about 90 unusual chirps. The 90 are detected by the giant detectors of LIGO in the USA, VIRGO in Europe, and KAGRA in Japan. The brighter the graphic is, the more energy is received on Earth. These chirps are giving humanity an unprecedented inventory of black holes and neutron stars, and a new way to measure the expansion rate of our universe. A fourth observing run with increased sensitivity is planned to begin in December of 2022.

Tomorrow's picture is comet tails.

Robert Nemiroff is an author and Jerry Bonnell is an editor.
Phillip Newman has specific rights.
NASA has a privacy policy on the internet.
There is a service at NASA.
& Michigan Tech. U.

Page 2

Discover the universe! Each day a different image or photograph of our universe is featured, along with a brief explanation written by an astronomer.

December 8th, 2021.
The featured image shows Hale-Bopp over the Dolomite.
The mountains appeared in 1997.
You can see the explanation for more detailed information.

There is a comet over Val Parola Pass.
The image is copyrighted by A. Dimai, (Col Druscie Obs.).

The great comet of 1997 became much brighter than any other stars. It was seen over bright city lights. It put on a great show away from the city lights. The Dolomite mountains surrounding Cortina d'Ampezzo, Italy, are where the picture was taken. The comet's blue ion tail is pushed out by the solar wind. The white dust tail is composed of larger particles of dust from the nucleus driven by the pressure of sunlight. Hale-Bopp was visible to the eye for 18 months, which was the longest visible comet in recorded history. The comet is expected to come back around 4385. The comet is getting brighter and may be visible to the eye.

The picture is of open space.

Robert Nemiroff is an author and Jerry Bonnell is an editor.
Phillip Newman has specific rights.
NASA has a privacy policy on the internet.
There is a service at NASA.
& Michigan Tech. U.