Do You Know | Science | Universe

The Universe comprises everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them. However, the term Universe may be used in slightly different contextual senses, denoting such concepts as the cosmos, the world or Nature.

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Q.  Why is the sky blue?
A.  Violet and blue light have short waves which are scattered more than red light waves. While red light goes almost straight through the atmosphere, blue and violet light are scattered by particles in the atmosphere. Thus, we see a blue sky.
Q.  What are Galileo Satellites?
A.  4 moons of Jupiter
Q.  Who was first to measure the circumference of Earth?
A.  Eratosthenes
Q.  How many other countries have sent moon mission earlier?
A.  Three, India is Fourth
Q.  What does indicate the color of a star?
A.  Its Temperature
Q.  How many minutes does it take for the suns rays to reach earth?
A.  8.4 minutes.
Q.  Who was the first person to walk on the moon?
A.  Neil Armstrong.
Q.  Which planet is known as the ‘Evening Star’?
A.  Venus.
Q.  That is one small step for man, but one giant leap for mankind" Who said this
A.  Neil Armstrong
Q.  What is the colour of the hottest star?
A.  Blue
Q.  Which planet is known as the red planet?
A.  Mars
Q.  When the Earth is very near to Sun in a Year?
A.  1st March
Q.  When the Earth is very far away from the Sun in a Year?
A.  12th December
Q.  The period of one revolution of Sun around the centre of galaxy is called?
A.  Cosmic year
Q.  Sea of Tranquility' and 'Ocean of Storms' are in
A.  Moon
Q.  What is the Sun?
A.  The Sun is just an ordinary star, one of billions of stars in the Universe. The Sun has a special name and is important to us because it is close enough to give Earth light and warmth. This light and warmth is what allows plants, animals and other living things to survive on our planet. Without the Sun there would be no life on Earth.
Q.  How hot is the Sun?
A.  The temperature at the core, or centre, of the Sun is about 16 million degrees Celsius. From the core, this incredible heat energy flows to the surface, where the temperature is closer to 6000 degrees Celsius. This is still so incredibly hot that it would melt anything it touched.
Q.  Why is the Sun so bright?
A.  The Sun is the brightest object in the sky because it is a giant ball of brightly glowing gas. Light from the Sun takes just over eight minutes to reach Earth, but when it gets here it is still so powerful that the light can damage your eyesight. That is why you should never look at the Sun directly and always wear sunglasses on sunny days.
Q.  When do solar eclipses happen?
A.  The Moon travels around Earth. A solar eclipse happens when the Moon comes in between the Sun and the Earth and casts a huge shadow onto the Earth. A total eclipse is rare, but when it happens, the Sun seems to disappear from the sky and for a few moments everything becomes cold and dark.
Q.  What is the solar system?
A.  The Solar system consists of the Sun and the planets that move around the Sun in oval paths called orbits. A planet is a vast ball of rock or gas that travels in orbit around a star. There are other objects in our solar system too, such as moons and asteroids. The Sun is so far away that if you tried to drive there, travelling at 100 kilometers an hour, it would take 170 years to reach your destination!
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