Black Holes are some of the most mysterious objects in the deep sky. Black holes are actually objects having huge mass concentrated in very little space. For example, a black hole having mass equal to that of earth (5.9742 × 1024 kilograms) will have a diameter of just 1.8 cm!! Yeah it is one point eight centimeters, there's no mistake and I'm not kidding. Black holes have massive gravitational energy and nothing not even light can escape them.
If you grab your old CRT monitor and squash it to millionth of a millionth of its original size, you will end up with a black hole measuring a couple of picometers in diameter. But it won't have sufficient gravity to grab hold of light since gravity of an object is directly proportional its mass. A true black hole(I mean a powerful one), has 300,000 times the mass of earth!
Now a quick glance over what makes it impossible (Nothing is impossible? Give it a second thought before saying so again) for almost everything (even light included) to escape a black hole. Why can't even light not escape it?
Light is energy. And according to Albert Einstein, mass contains energy and energy has got mass i.e. mass and energy are different forms of the same thing
Now consider our earth. If you throw a ball up in the air (obviously using your very own hands), it will reach a certain height and ultimately fall back to the earth. This is due to earth's gravity. But if throw a ball with an acceleration greater than the acceleration due to gravity (9.8 m/s2) or in other words, with a velocity more than 9.8 m/s, the ball will overcome the earth's gravity and will not be influenced by it any more. Similarly, the black holes have a massive gravity that even objects moving as fast as that speed of light (299 792 458 m / s) are not able to dominate it. Hence even light is attracted towards black holes.
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