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Articles sur Stars

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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.
TRAPPIST-1e is a rocky exoplanet in the habitable zone of a star 40 light-years from Earth and may have water and clouds, as depicted in this artist’s impression. NASA/JPL-Caltech/Wikimedia Commons

To search for alien life, astronomers will look for clues in the atmospheres of distant planets – and the James Webb Space Telescope just proved it’s possible to do so

Life on Earth has dramatically changed the chemistry of the planet. Astronomers will measure light that bounces off distant planets to look for similar clues that they host life.
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.
A composite image of the data collected by the ALMA telescope in Chile, showing spiral galaxies in the Virgo Cluster. ALMA (ESO/NAOJ/NRAO)/S. Dagnello (NRAO)/T. Brown (VERTICO)

Why it’s location, location, location, even when it comes to galaxy evolution

Studying the extreme environment of the Virgo Cluster — which comprises thousands of galaxies — helps us learn what factors can affect and start or stop star formation.

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