Articles sur Galaxy formation

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A colour image of G63349, one of the galaxies in the survey, created using near-infrared (VISTA telescope) and optical (Sloan telescope) data collated by the GAMA survey. (The bright green object is a nearby star.) ICRAR/GAMA

Don’t panic, but the universe is slowly dying

Our universe's most exciting days are well behind us, with new research showing the universe is now slowly but surely dying.
An artist’s impression of a galactic protocluster forming in the early universe. European Southern Observatory

From galactic pile-ups, stars are born: a crash course in clusters

Clusters of galaxies have back-stories worthy of a Hollywood blockbuster: their existences are marked by violence, death and birth, arising after extragalactic pile-ups where groups of galaxies crashed…
Gemini North observatory, on Hawaii’s Mauna Kea, shoots a laser beam into the night sky to create an ‘artificial star’, part of a process that helps astronomers remove blurring from any images of galaxies. Gemini Observatory and Association of Universities for Research in Astronomy

Laser helps find supermassive black hole in a small galaxy

A supermassive black hole has been found in an ultracompact dwarf galaxy – the smallest galaxy known to contain such a massive black hole. This finding, published today in Nature, suggests that supermassive…
There are some massive galaxies out there, and we now know a little about their early life. Lauro Roger McAllister/Flickr

It’s about time: young galaxies were dense, intense star-makers

A piece of the galaxy formation puzzle may have fallen into place, thanks to a team of European and American astronomers peering into the depths of our early universe. According to new research published…
A dwarf galaxy: a challenge for modern cosmology? This dwarf galaxy ESO 540-31 is more than 11 million light-years from Earth, in the constellation of Cetus (The Whale). , Luca LimatolaESA/Hubble & NASA

A cosmic two-step: the universal dance of the dwarf galaxies

Over the last few years we’ve been studying the orbits of dwarf galaxies and we expecting to find them buzzing at random around large galaxies. But looking out into the universe, we see some dwarfs undertaking…
Arp220 is a nearby Ultraluminous Infrared Galaxy similar to what ALESS65 would look like if it were closer to Earth. NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University)

Red and dead future for a galaxy running out of star fuel

A galaxy more than 12 billion light years from Earth is heading for a “red and dead” future because it is running out of the fuel needed to make new stars. The galaxy, known as ALESS65, is an ultra-luminous…

Strings of galaxies found in voids

Galaxies arranged in delicate strings have been discovered in the huge, empty regions of the universe called voids. A research…
The reflected light from black holes enables astronomers to see how fast matter is swirling in the inner region of the disk, and ultimately to measure the black hole’s spin rate. NASA/JPL-Caltech

NASA puts new spin on black holes

Scientists in the US have successfully used a new NASA telescope to help improve our understanding of how black holes and…
The Andromeda galaxy and its companions is challenging the very foundations of cosmology. Adam Evans/Wikimedia Commons

Cosmic dance challenges our understanding of the universe

Deep images of the sky reveal that the universe contains billions of galaxies. Some, such as our own Milky Way, are immense, containing hundreds of billions of stars. Most galaxies, however, are dwarfs…
The black hole at the centre of NGC 1277 galaxy is one of the largest ever discovered. NASA /ESA/Andrew C. Fabian/Remco C. E. van den Bosch (MPIA)

‘Overmassive’ black hole holds the mass of 17 billion suns

Astronomers have discovered a new, enormous black hole that could change our understanding of how galaxies evolve. Holding the mass of 17 billion suns, the black hole at the centre of the NGC 1277 galaxy…

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