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Articles sur Astrophysics

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When two neutron stars merge and create a black hole, they produce a powerful blast of gamma rays. A. Simonnet (Sonoma State Univ.) and NASA’s Goddard Space Flight Center

Unusual, long-lasting gamma-ray burst challenges theories about these powerful cosmic explosions that make gold, uranium and other heavy metals

Gamma-ray bursts occur when a massive star explodes or when two neutron stars merge. A newly discovered burst has puzzled astronomers, as it lasted much longer than astronomers would have expected.
The James Webb Space Telescope is providing astronomers with images and data that reveal secrets from the earliest era of the universe. NASA/STScI

How the James Webb Space Telescope has revealed a surprisingly bright, complex and element-filled early universe – podcast

It has been one year since the launch of the James Webb Space Telescope and six months since the first pictures were released. Astronomers are already learning unexpected things about the early universe.
A new particle accelerator at Michigan State University is set to discover thousands of never-before-seen isotopes. Facility for Rare Isotope Beams

Powerful linear accelerator begins smashing atoms – 2 scientists on the team explain how it could reveal rare forms of matter

A new particle accelerator has just begun operation. It is the most powerful accelerator of its kind on Earth and will allow physicists to study some of the rarest matter in the universe.
VFTS 243 is a binary system of a large, hot blue star and a black hole orbiting each other, as seen in this animation. ESO/L.Calçada

Astronomers have found an especially sneaky black hole – discovery sheds light on star death, black hole formation and gravitational waves

Astronomers have discovered the first dormant black hole outside of the Milky Way. These black holes are not absorbing matter from a nearby star, making them incredibly hard to find.
The mirror on the James Webb Space Telescope is fully aligned and producing incredibly sharp images, like this test image of a star. NASA/STScI via Flickr

The James Webb Space Telescope is finally ready to do science – and it’s seeing the universe more clearly than even its own engineers hoped for

It has taken eight months to test and calibrate all of the instruments and modes of the James Webb Space Telescope. A scientist on the team explains what it took to get Webb up and running.
Some stars travel at high speeds through the universe and sometimes leave spectacular clouds of dust and gas in their wake. NASA, ESA and R. Sahai (NASA's Jet Propulsion Laboratory)

Real shooting stars exist, but they aren’t the streaks you see in a clear night sky

Hypervelocity stars were discovered only 15 years ago and are the closest things in existence to real shooting stars. They travel at millions of miles per hour, so fast that they can escape from galaxies.
An artist’s impression of the Double Pulsar system in which the two pulsars orbit each other every 2.5 hours and send out high-energy beams that sweep across the sky. Image credit: John Rowe Animations/CSIRO

We counted 20 billion ticks of an extreme galactic clock to give Einstein’s theory of gravity its toughest test yet

Astronomers watched a pair of pulsars for 16 years to test the theory of general relativity, which has stood unchallenged for over a century.

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