Space collisions between black holes and neutron stars

June 30, 2021
A black hole colliding with a neutron star, ripples in spacetime A black hole colliding with a neutron star, ripples in spacetime

Daily Times, Dubai United Arab Emirates:- Astronomers have confirmed that two rare space events have been observed when a black hole collides with a neutron star, causing ripples in space-time.

  • "Spacetime" is a physical concept that integrates (time and space) and can be defined as space with its four dimensions (the three spatial dimensions: length, width and height, in addition to time).
  • One of the possible ends of a star is neutron stars, and these stars are caused by massive stars - their masses are in the range between 4 and 8 times the mass of the Sun.
  • After burning all the nuclear fuel on the star, this star suffers from a supernova explosion, a cosmic event that occurs during the last evolutionary stages of a massive star's life, and this explosion ejects the outer layers of the star in the form of beautiful supernova remnants.

As for the ripples that will occur in spacetime, they are called gravitational waves that travel more than 900 million light-years to reach detectors on Earth.

The first of the two collisions was discovered on January 5, 2020 by the Virgo Observatory in Italy, and one of two devices that make up the Laser Gravitational Wave Observatory (LIGO) in the United States, as the second LIGO detector was temporarily offline, according to Sky News Arabia.

In this collision, the mass of the black hole was about 8.9 times greater than the sun, while the neutron star is about 1.9 times the mass of the sun.

As for the second event, observed on January 15, 2020, by all three detectors, it was a black hole with a mass of about 5.7 times the mass of the sun, while it swallowed a neutron star more than 1.5 times the mass of the sun.

At the same time, LIGO detected other events that could be collisions between black holes and neutron stars, but these two discoveries were the most obvious and accurate.

Because the two events were so far away, astronomers were unable to detect any light in the sky from the collisions.

And if they were close, it was possible that there was no visible light from the collision because black holes were much larger than neutron stars.

“The simulations indicate that the neutron star will be swallowed whole, not shredded,” says Astrid Lamberts, a member of the LIGO team at the Observatory of the Cote d'Azur (OCA) in France. "These stars may disappear into the black hole."

"Observations like this can help us learn how such unparalleled exotic partners form, where a black hole and a neutron star can be born as a pair of stars that already orbit each other."

She continued: "The couple can meet during their lives. There are initial indications that the latest speculation may be correct for the second collision, but there is nothing concrete enough to say with certainty."

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