Dark matter - Wikipedia
Cold dark matter leads to a bottom-up formation of structure with galaxies forming first and galaxy clusters at a latter stage, while hot dark matter would result in a top-down formation scenario with large matter aggregations forming early, later fragmenting into separate galaxies; [clarification needed] the latter is excluded by high-redshift ...
What Is Dark Matter? | NASA Space Place – NASA Science for Kids
2024年12月5日 · Dark matter is that invisible glue that keeps stars, dust, and gas together in a galaxy. This mysterious substance makes up the majority of a galaxy's mass and forms the foundation of our Universe's structure.
Dark Matter - Science@NASA
Hubble found that galaxies can be embedded in haloes of dark matter, and that dark matter can be forced away from galaxy clusters and separated from normal matter by galaxy collisions. It found the smallest clumps of dark matter known and …
If dark matter is 'invisible,' how do we know it exists? | Space
2023年5月4日 · Put simply, to detect dark matter, astronomers look at its indirect effects on gravity and how it impacts other objects with mass and light.
Dark galaxy - Wikipedia
A dark galaxy is a hypothesized galaxy with no (or very few) stars. They received their name because they have no visible stars but may be detectable if they contain significant amounts of gas. Astronomers have long theorized the existence of dark galaxies, but there are no confirmed examples to date. [1]
Dark Matter - NASA Science
The mission will measure the locations and quantities of both normal matter and dark matter in hundreds of millions of galaxies. Throughout cosmic history, dark matter has driven how stars and galaxies formed and evolved.
Mystery of Galaxy’s Missing Dark Matter Deepens - Science@NASA
2021年6月17日 · When astronomers using NASA’s Hubble Space Telescope uncovered an oddball galaxy that looked like it didn’t have much dark matter, some thought the finding was hard to believe and looked for a simpler explanation.