- #1
iRaid
- 559
- 8
Interesting
http://www.technologyreview.com/blog/arxiv/26316/?ref=rss
http://www.technologyreview.com/blog/arxiv/26316/?ref=rss
A black hole is a region in space with a gravitational pull so strong that nothing, including light, can escape from it. It is formed when a massive star dies and its core collapses under its own gravity.
Scientists are able to detect black holes through their gravitational effects on surrounding matter. This can be observed through the distortion of light, the orbit of nearby stars, and the emission of X-rays from the hot matter falling into the black hole.
Dark matter is a type of matter that makes up about 27% of the universe. It does not interact with light, making it invisible, but its presence can be inferred through its gravitational effects on visible matter.
Dark matter plays a crucial role in the structure and evolution of the universe. Without it, galaxies would not have enough mass to hold together and the universe would look very different. Studying dark matter can also provide insights into fundamental physics and the nature of the universe.
No, dark matter cannot be directly observed because it does not interact with light. However, scientists use various methods such as gravitational lensing and galaxy rotation curves to indirectly study its presence and distribution in the universe.