Category: Cosmology

stars

All about stars and news

The star HR9024 loses weight due to incredible coronal mass ejections – News of June 11, 2019 – Observed from afar, the sun may seem like a shiny, smooth ball. Modern astronomy has shown that in reality the surface of our star is covered with bubbles and filaments, some of which may be absolutely gigantic.…
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galaxies

Galaxies : all you have to know and news

Giant galaxies put the size of the Milky Way in perspective – News of May 28, 2019 – In comparison to the dwarf galaxies that surround us, the Milky Way and Andromeda may seem immense. Their diameter is indeed spread over hundreds of thousands of light-years. But if you search the whole observable universe, you…
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Antimatter : all you have to know and news

Italian researchers succeed in interfering with antimatter – News of May 21, 2019 – In 1923, the French physicist Louis de Broglie published a surprising article. He formulates the hypothesis that matter has an associated wave. Over the next few years, this was confirmed when researchers succeeded in interfering with electrons, protons and even whole…
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milky way galaxy

All about the Milky Way and news

An atypical star would prove that the Milky Way has swallowed its cosmic neighbors – News of May 14, 2019 – The Milky Way is surrounded by dozens of dwarf galaxies like the Small and the Large Magellanic Cloud. There are clues that our galaxy has swallowed some of its smaller neighbors in its history.…
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neutron stars

All about neutron stars and news

LIRGO and VIRGO detect the meeting of a neutron star and a black hole – News of May 7, 2019 – In 2015, the first gravitational wave was observed, nearly a hundred years after Albert Einstein predicted their existence. Gravitational waves are oscillations in the curvature of space-time. They occur when masses are accelerated. These…
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wormholes

Wormholes : all you have to know and news

Wormholes would not be shortcuts, on the contrary – News of April 30, 2019 – In 1915, Albert Einstein presented his theory of general relativity, a revolutionary description of gravitation. A few weeks later, he received two letters from another German physicist Karl Schwarzschild. These letters contained the first exact solution to the equations of…
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supermassive black hole

All about supermassive black holes and news

The first photo of a supermassive black hole has been unveiled – News of April 11, 2019 – Event Horizon Telescope achieves a precision feat Event Horizon Telescope unveiled the first photo of a black hole in the center of the M87 galaxy. It is a very active supermassive black hole, located about 55 million…
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pulsars

All about pulsars and news

The pulsar PSR J0002 + 6216 was ejected at an incredible speed by a supernova – News of April 2, 2019 – Supernovas and pulsars are linked because a supernova can give birth to a pulsar. When some massive stars arrive at the end of their life, their hydrostatic balance is broken. The thermonuclear reactions…
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supernova

All about supernovas and news

N6946-BH1, story of a failed supernova – News of March 24, 2019 N6946-BH1 is a star that had a rather singular end. It was a very big star, about 25 times more massive than the sun. It has been observed in the NGC 6946 galaxy located about 22 million light-years away from us. We can…
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hypervelocity stars

All about hypervelocity stars (HVS) and news

The speed of the hypervelocity star LAMOST-HVS1 could have a surprising origin – News of March 19, 2019 – The first hypervelocity star was discovered in 2005. These objects are so fast that their speed exceeds the speed of liberation of the galaxy. They travel at velocities that exceed 500 km per second, which means…
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planet x

All about planet X / planet 9 and news

The observation of another planetary system could explain the orbit of a planet X – News of March 12, 2019 – FarFarOut is part of a class of objects named extreme transneptunians objects. Other objects in this category all have a very eccentric orbit. This is why some researchers believe that a massive object has…
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end of the universe

All about the end of the universe and news

Big Crunch, Big RIP, Big Freeze … How will the universe end ? – News of February 10, 2019 – According to the Big RIP model, the accelerated expansion of the universe continually distances large structures and small structures until even subatomic particles are so far apart that none of the fundamental forces can act.…
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expansion of the universe

All about the expansion of the universe and news

Expansion of the universe could be measured through quasars – News of February 5, 2019 – Dark energy is one of the most important mysteries of modern astronomy. We know since 20 years that the expansion of the universe is accelerating. Our universe is growing every day and growing faster and faster. If the universe…
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black holes

All about black holes and news

The first image of a black hole will be revealed tomorrow – News of April 9, 2019 – Tomorrow, the Event Horizon Telescope project will finally reveal either the image of Sagittarius A *, or the image of a supermassive black hole located in the center of the Milky Way. We may have seen the…
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frb fast radio bursts

All about fast radio bursts (FRB) and news

The origin of fast radio bursts (FRB) is always a mystery – News of January 13, 2019 In recent days, there has been a lot to say about fast radio bursts, the FRB. This phenomenon is still poorly understood and becomes even more intriguing. In 2007, David Narkevic, then a student at the West Virginia…
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blazars

All about the blazars and news

The light emitted by the blazars makes it possible to better know the universe – News of December 11, 2018 – A team of researchers has devised a method to calculate the number of photons that have been produced in the entire observable universe since its creation. When we look at the sky, we can…
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gravitational waves

All about gravitational waves and news

Gravitational waves could carry messages – News of November 4, 2018 – A team of Russian mathematicians has just published a study. According to this study, it should be possible to encode a message in gravitational waves. There is, however, a huge gap between theory and practice. Although it is possible to encode information in…
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galaxy clusters

All about clusters of galaxies and news

Can we calculate the mass of a cluster of galaxies ? – News of October 28, 2018 – We could try to represent the mass of a cluster of galaxies with respect to the mass of the Milky Way. But the problem is that we do not really know the mass of the Milky Way.…
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