Archive for the ‘cosmology’ category: Page 17

Oct 3, 2022

Wobbly Star Reveals the Closest Black Hole Yet

Posted by in category: cosmology

But black holes do have gravity, and they know how to use it. If a black hole has a stellar companion, and they orbit each other closely enough, the former can strip some of the gas from the star. The gas falling into the black hole heats up and shines in high-energy radiation. Astronomers have found more than 50 such systems in the Milky Way.

However, when a black hole and its companion star orbit each other at a greater distance, the star remains whole. The black hole is then dormant and much more challenging to spot. To find it, one has to search for wobbling stars whose peculiar motion could be due to an unseen dark companion.

This is how a team of astronomers discovered the newest black hole candidate, which they call Gaia BH1. (The study, which is under review, is available here). Although it isn’t the first proposed candidate of its kind, it seems to be the most compelling to date.

Oct 1, 2022

Ask Ethan: How does the CMB prove the Big Bang?

Posted by in category: cosmology

In the 20th century, many options abounded as to our cosmic origins. Today, only the Big Bang survives, thanks to this critical evidence.

Sep 26, 2022

NASA’s DART to Hit Asteroid

Posted by in category: cosmology

Preview of NASA’s Double Asteroid Redirection Test, or DART, the first asteroid deflection mission.

Worm-hole generators by the pound mass:

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Sep 25, 2022

How infinity threatens cosmology

Posted by in categories: cosmology, mathematics, physics

Infinity is back. Or rather, it never (ever, ever…) went away. While mathematicians have a good sense of the infinite as a concept, cosmologists and physicists are finding it much more difficult to make sense of the infinite in nature, writes Peter Cameron.

Each of us has to face a moment, often fairly early in our life, when we realize that a loved one, formerly a fixture in our life, was not infinite, but has left us, and that someday we too will have to leave this place.

This experience, probably as much as the experience of looking at the stars and wondering how far they go on, shapes our views of infinity. And we urgently want answers to our questions. This has been so since the time, two and a half millennia ago, when Malunkyaputta put his doubts to the Buddha and demanded answers: among them he wanted to know if the world is finite or infinite, and if it is eternal or not.

Sep 24, 2022

Black Holes

Posted by in categories: cosmology, space travel

Issac Arthur play list.

SFIA looks at uses for black holes ranging from spaceships to artificial worlds to escaping the Heat Death of the Universe.

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Sep 24, 2022

Is Webb Breaking the Big Bang Paradigm?

Posted by in category: cosmology

There is a lot of culture and philosophy built into the Big Bang theory as we understand it.

Sep 24, 2022

After the big bang, light and electricity shaped the early universe

Posted by in category: cosmology

After the big bang, electricity and light filled the universe in what’s called the epoch of reionization. The James Webb Space Telescope is hunting for more clues to explain this time period.

Sep 23, 2022

Scientists Discover the Nearest Black Hole to Our Solar System Ever Found

Posted by in categories: computing, cosmology, physics

Astronomers have recently found the nearest known black hole to our solar system. According to scientists, the black hole is 1,570 lightyears away and ten times larger than our sun.

Known as Gaia BH1, the research was led by Harvard Society Fellow astrophysicist Kareem El-Badry, with the Harvard-Smithsonian Center for Astrophysics (CfA) and the Max Planck Institute for Astronomy (MPIA).

In addition, El-Badry worked with researchers from CfA, MPIA, Caltech, UC Berkeley, the Flatiron Institute’s Center for Computational Astrophysics (CCA), the Weizmann Institute of Science, the Observatoire de Paris, MIT’s Kavli Institute for Astrophysics and Space Research, and other universities.

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Sep 22, 2022

Bubble of hot electrons seen hurtling around our galaxy’s black hole

Posted by in category: cosmology

For about two hours, a bubble of extremely hot electrons whirled around the Milky Way’s supermassive black hole at 30 per cent of the speed of light, and then it was destroyed.

Sep 22, 2022

Look! Astronomers find a hot ball of plasma circling the Milky Way’s massive black hole

Posted by in category: cosmology

This bubble takes just about an hour to whip around a black hole.

This bubble that circles the event horizon of Sgr A takes just 70 minutes to whip around the black hole. It was observed by the Event Horizon Telescope.

Continue reading “Look! Astronomers find a hot ball of plasma circling the Milky Way’s massive black hole” »

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