1. What is a Black Hole,what are its parts and what does it do?
Check this site.
http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html
A black hole is a body of matter that is so dense that its gravitational attraction will not let light or anything else escape. Matter that gets sucked inside it disappears from the universe forever, but adds to the mass of the black hole.
Black holes are sometimes formed when very heavy stars run out of fuel and collapse due to their own gravity. This is the cause of some supernova events. The typical diameter of a black hole formed in this manner is only a few kilometers. According to Stephen Hawking, smaller "mini" black holes may also exist, but none have so far been observed.
A black hole is a region in space where gravity is so immensely strong that nothing, not even light, can escape its pull. It is formed when a massive star collapses under its own gravitational force, creating an incredibly dense object with a strong gravitational field.
To understand the parts and functions of a black hole, we need to consider its key components:
1. Singularity: At the core of a black hole lies the singularity, which is an infinitely small and dense point. This is where all the matter and energy that falls into the black hole becomes concentrated, resulting in an extremely high gravitational force.
2. Event Horizon: The event horizon is the boundary around the black hole beyond which nothing can escape. Once a particle or object crosses this point, it can no longer return or be observed from outside the black hole. Anything that crosses the event horizon is lost forever.
3. Accretion Disk: In some cases, black holes have an accretion disk formed by matter that gets pulled towards the black hole but doesn't fall into it right away. The matter in the accretion disk gets accelerated and heated, causing it to emit high-energy radiation, such as X-rays.
The primary function of a black hole is to attract matter and energy with its gravitational force. Once matter crosses the event horizon, it is forever trapped within the black hole, ultimately adding to its mass. Black holes can grow larger and more powerful as they consume nearby objects like stars or gas clouds.
It's important to note that our understanding of black holes is based on theories and observations, as direct observation of black holes is challenging due to their light-trapping nature. Scientists study their effects on surrounding matter, gravitational waves, and X-ray emissions to learn more about these fascinating cosmic phenomena.