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what is bigbang theory?

A cosmological theory holding that the universe originated approximately 20 billion years ago from the violent explosion of a very small agglomeration of matter of extremely high density and temperature.

What is a black hole in space?
A black hole is a region of space in which the gravitational field is so powerful that nothing, including light, can escape its pull. The black hole has a one-way surface, called an event horizon, into which objects can fall, but out of which nothing can come

Do fish breathe water?
Yes, fish essentially breathe water through their gills, but they don't use the water to make energy, but the oxygen that is dissolved in the water. In essence, fish are like us except they use a different mechanism to get their oxygen!

Why does the sky look blue?
White sunlight is really a lot of different colors of light mixed together. Some colors of light travel through air and dust better than others. Red goes a long, long way. But blue light gets bounced around a lot. Our blue sky is blue light that has been bounced out of sunlight by gazillions of molecules of air.

How does hovercraft run?
Hovercraft, also known as an Air Cushion Vehicle (ACV) can run on any type of surface. This vehicle uses a cushion of high pressurized air to lift it slightly above the surface so that there is no contact with the later. The main objective is to reduce any form of friction that is generated when a vehicle runs on a surface. This means that a hovercraft runs on air. Do take a look at the episode on gas and pressure to see how I made my own hovercraft and how you can try and make a miniature version of it. Just like how your sports shoes have packed air to form an air cushion under your feet to make your running or walking much easier and comfortable.

Why does a iron needle sinks in water but a iron ship floats on water?
The shape of the ship is such that it displaces water equal to the weight of the ship. On the other hand a needle being solid displaces very little water and thus is not greater than the weight of the needle.

What is the radius of Venus?
The radius of Venus is 6,052 km. The equatorial radius of Earth is 6,378 km, so the radius of Venus is 95% the radius of Earth. With such a similar size, you can see why Venus is considered Earth's twin planet.

There is no oxygen in space then how can sun burn?
First of all the Sun does not burn, because burning is an oxidation process and you rightly said that there is no oxygen in space. What makes the sun glow is a process called Nuclear Fusion that takes place at its center which turns its hydrogen into helium. The temperature at the sun's surface is about 6,000ºC, while at the center it is over 15,000,000ºC.

What is echo?
Echo is when we hear sound once created as repetition. For example if you stand in an empty parking lot and say your name loudly, you will hear it a multiple times. This is because, your voice travels as sound waves and hits the many, large empty walls of the parking lot and reflects the sound back at you. Try it!!

Will any time by chance any other planet will have life on it?
Then instead of traveling to different countries we would be traveling in space to different planets in our space crafts. And of course the star wars would then be true...but as far as we know, Earth is the only planet which has life. There may be life on other planets within our Solar System, but we definitely have not found them yet. The only possible planet within our Solar System which has the potential for life is Mars. So I guess we just have to wait and watch till then.

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