There are two approaches to the problem of galaxy formation: we can look at galaxies now and hope to find some fossil evidence for their early history, or we can study theoretical cosmology and discuss the evolution of various kinds of inhomogeneity. The difficulty with the first approach is ...
Scientists Shed Light on How Spiral Galaxies are FormedKyle McDermott
–How many galaxies are there? –Hubble’s law: Why are most galaxies moving away from us? –How black holes and galaxies play tug-of-war across the cosmos As the gas collapsed and its density increased, some stars formed very early on, before the gas had stabilised into a rotating disc...
Many of those points of light are actually galaxies — collections of millions to trillions of stars. Galaxies are composed of stars, dust and dark matter, all held together by gravity. Astronomers aren't certain exactly how galaxies formed. After the Big Bang, space was made up almost ...
根据第一段“Do you know anything about galaxies (星系)? Are you interested in them? How many galaxies can you name? Researchers have identified two ancient star groups that appear to be among the Milky Way Galaxy’s earliest parts. The groups are named after the Hindu gods Shakti and ...
Some of the faintest objects ever observed suggest that small galaxies get the credit for clearing the ‘fog’ pervading the early cosmos.
Detailed observations of molecular gas in a tidal dwarf galaxy have important implications for our understanding of how stars are formed. A lot is known about galaxies. We know, for instance, that the stars within them are shaped from a blend of old star dust and molecules suspended ...
The findings are relevant to the early universe because, like early galaxies, there are relatively few heavy elements to be found in the Small Magellanic Cloud. This means that the stars here burn hot and bright and die off quicker than stars in our galaxy. Seeing how stars are born in th...
They are thebrightest galaxiesin the universe, forming about 2 billion years after the Big Bang. Their brightness has long sparked debate about how they formed. "Twenty years ago, people said, 'Oh wow, they are so much brighter than anything else. What are they?'" Haverford College's Desi...
Galaxies’ spiral arms are responsible for scooping up gas to feed to their central supermassive black holes, according to a new high-powered simulation. Started atNorthwestern University, the simulation is the first to show, in great detail, how gas flows across the universe all the way...