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Read this excerpt from "Why Are They Called Black Holes?"

Scientists cannot see gravity, but they can see its effects. The gravity of a black hole will swallow matter and light that drift close enough to it. Some light passing by a black hole can be far enough away that it could avoid being sucked in, but the path of the light would still be bent by gravity.

Astronomers can observe these effects. For example, when a black hole passes through a cloud of dust, it pulls the dust inside it like a big gravity-powered vacuum cleaner. When a star passes too close to a black hole, the black hole pulls it in and breaks up the star, spewing giant flashes of high energy called gamma-ray bursts. And when scientists see light bending even though there is no visible matter nearby, they have evidence that there is an invisible black hole.

What must be present for scientists to detect black holes?

a cloud of dust
a gamma ray burst
the loss of a star
the force of gravity

Around a black hole there is a position of no return, called the event horizon. It is called "black" because it absorbs all the light that hits it, reflecting nothing, just like a perfect black body in thermodynamics.

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the force of gravity

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communication is extremely important in any relationship. importance of communication has been stressed upon time and again. lack of communication creates a number of problems that only increase with time.

it is often seen that the families where people talk to each other frequently are happier. they share their joys, sorrows and other emotions with each other. there is a lively atmosphere in such families. they laugh it out together and celebrate every moment whole-hearted. they never feel lonely or bored. they know whenever they want to talk about something or share an emotion they always have an ear to listen to. such is the importance of communication.

compared to this, the families where all the members are engrossed in their own tasks and do not bother to care about or talk to people around them are usually not as happy. the atmosphere in such families is quite dull and gloomy. people are busy with their own tasks. they have friends outside and are not as close with their family members.

they plan outings with their friends and colleagues rather than their family members. this is because they have neglected the importance of communication all along and are thus not comfortable communicating with each other. and without good communication there is no way one can enjoy.

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