Menu

Blog

Archive for the ‘cosmology’ category: Page 123

May 27, 2023

This new supernova, the brightest in years, could help astronomers forecast future star explosions

Posted by in categories: cosmology, futurism

A new supernova has turned into the most watched phenomenon in the May night sky. The close proximity of the stellar explosion and the vast amount of observations gathered since the discovery promise to advance astronomers’ understanding of stellar evolution and could even lead to major advances in supernova forecasting.

Supernovas are powerful explosions in which very massive stars, at least eight times more massive than our sun, die when they use up all the hydrogen fuel in their cores. The discovery of this latest exploding star, known officially as 2023ifx, was a serendipitous one.

May 26, 2023

Hubble telescope may have just found a rare, ‘missing link’ black hole hiding near Earth

Posted by in category: cosmology

A potential intermediate-mass black hole may be lurking in Messier 4, the nearest globular star cluster to Earth, new Hubble data reveals.

May 25, 2023

The possibility of a bouncing universe challenged

Posted by in category: cosmology

New studies reveal that the universe originated with a Big Bang rather than a bouncing phenomenon, challenging previous theories.

The viability of a bouncing universe, a cosmological theory proposing that our universe formed from the contraction and subsequent expansion of a prior universe, has been questioned in a recent study by two publications published by experts.

The new investigations support the idea that the universe’s expansion and contraction may have occurred only once, contrary to the bouncing universe theories’ assertion that this cycle may have happened.

May 25, 2023

LIGO starts its fourth round of searching for gravitational waves and black holes

Posted by in categories: biotech/medical, cosmology, engineering, physics

After three years of upgrading and waiting, due in part to the coronavirus pandemic, the Laser Interferometer Gravitational-wave Observatory has officially resumed its hunt for the signatures of crashing black holes and neutron stars.

“Our LIGO teams have worked through hardship during the past two-plus years to be ready for this moment, and we are indeed ready,” Caltech physicist Albert Lazzarini, the deputy director of the LIGO Laboratory, said in a news release.

Continue reading “LIGO starts its fourth round of searching for gravitational waves and black holes” »

May 24, 2023

Astronomers explore a recently discovered luminous quasar

Posted by in categories: cosmology, physics

Using various space telescopes, an international team of astronomers have observed a recently detected luminous quasar known as SMSS J114447.77–430859.3, or J1144 for short. Results of the observational campaign, available in the July 2023 edition of Monthly Notices of the Royal Astronomical Society, shed more light on the properties of this source.

Quasars, or quasi-stellar objects (QSOs) are (AGN) of very high luminosity, emitting observable in radio, infrared, visible, ultraviolet and X-ray wavelengths. They are among the brightest and most distant objects in the known universe, and serve as fundamental tools for numerous studies in astrophysics as well as cosmology. For instance, quasars have been used to investigate the large-scale structure of the universe and the era of reionization. They also improved our understanding of the dynamics of supermassive black holes and the intergalactic medium.

J1144 was detected in June 2022 at a redshift of 0.83. It has a bolometric luminosity of about 470 quattuordecillion erg/s, which makes it the most luminous quasar over the last 9 billion years of cosmic history. It is also the optically brightest (unbeamed) quasar at a redshift greater than 0.4.

May 23, 2023

Strange star system may hold first evidence of an ultra-rare ‘dark matter star’

Posted by in categories: cosmology, particle physics

In a distant star system, a sunlike star orbits an invisible object that may be the first example of a ‘boson star’ made of dark matter, new research suggests.

May 22, 2023

Hello, Computer — Sabine Hossenfelder — A.I. going mainstream

Posted by in categories: cosmology, mathematics, media & arts, particle physics, quantum physics, robotics/AI

Perspective from a very-educated layman. Er, laywoman.


This is Hello, Computer, a series of interviews carried out in 2023 at a time when artificial intelligence appears to be going everywhere, all at once.

Continue reading “Hello, Computer — Sabine Hossenfelder — A.I. going mainstream” »

May 21, 2023

Scientific marvel: Student discovers the secret of black holes

Posted by in category: cosmology

Black holes have always been fascinating to scientists and the general public alike as even light can’t escape their gravitational pull.

May 19, 2023

Measuring Cosmic Expansion with a Lensed Supernova

Posted by in category: cosmology

This year marks the 100th anniversary of Edwin Hubble’s observation of a pulsating star called a Cepheid variable in the Andromeda nebula. The star was surprisingly faint, implying that it was very far away and that Andromeda must be a separate galaxy—the first evidence that our Milky Way is not alone. Hubble went on to uncover other galaxies and found that they were all moving away from us—a cosmic expansion characterized by the so-called Hubble constant. Astronomers have now used another star, an exploding supernova whose light was bent as it traveled to Earth, to probe the expansion [1]. By determining a time delay between different images of the supernova, the team has recovered a value of the Hubble constant that is lower than estimates based on Cepheids and on other distance markers. However, the error bars are large for the new measurement, so astronomers will need more observations to make lensed supernovae a precision speed check on cosmic expansion.

A lensed supernova is created by the light-bending power of gravity. When a supernova is behind a galaxy, relative to Earth, the light from the exploding star gets curved around the galaxy by the galaxy’s gravity. This action both distorts the star’s image and magnifies it, just like a magnifying glass. Sometimes this lensing can produce multiple images of the star, with each appearing at a different point in the sky. The light from such a set of images travels to Earth along different paths, and so arrives at Earth at different times. In 1964, the astronomer Sjur Refsdal proposed using the time delays to measure the Hubble constant. But detecting a multi-imaged supernova has proved tricky.

Luck finally came 50 years after Refsdal’s proposal. In a Hubble space telescope image from December 2014, Patrick Kelly, then at the University of California, Berkeley, and now at the University of Minnesota, spotted four lensed images of the same supernova [2]. The team was unable to determine the exact time delays between these images, but from previous observations of this part of the sky, Kelly and his colleagues predicted that a fifth image was on the way. This expectation was based on the spotted supernova sitting behind a galaxy cluster, rather than a single galaxy, so the supernova light had multiple paths to reach Earth. The astronomers kept a steady watch, and sure enough the fifth image appeared in December 2015, roughly 376 days after the other four images. This long time delay, which was caused by the cluster’s large mass density, was a boon to the cosmic expansion measurement.

May 19, 2023

Modern science explains the origin of the universe with the Big Bang theory

Posted by in categories: cosmology, physics, science, singularity

It says our world arose from the explosion of singularity or a point in space-time where energy, density, and mass go to infinity, and any dimension goes to zero. It’s a point where there’s no space, time, or matter.