Universe

How was the moon formed?

Aug 17th, 2008 | By

According to a theory called condensation theory it is believed that the earth was formed 4.5 billion years back from the nebula, a cloud which contains gas and dust particles. It is commonly believed that the moon and earth both are made from this cloud which when condensed changes to pebbles, rocks etc. but it
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Why does the moon turn red?

Aug 14th, 2008 | By

Usually red color of moon is seen during an eclipse. The reason behind this is exactly the same that why sun appears red during sunrise and sunset. Sun always shines, when there is night in one part of the earth the other part is having day. When the earth comes between the sun and the
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How was the universe created?

Aug 14th, 2008 | By

The most common and acceptable theory about the creation of universe is “the big bang theory” which suggests that there was a very small point of light having unimaginable density and heat energy which exploded spontaneously nearly 15 billion years ago just before the beginning of universe. This theory has come up with the explanation
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How many stars are there in universe?

Aug 10th, 2008 | By

Sky looks so beautiful in the night with the twinkling stars but have you ever tried to count these stars. This question is really challenging for philosophers, scientists, astronomers, dreamers etc. These stars present in the space are not randomly scattered but they occur together in huge groups which are called galaxies. It is estimated
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What are shooting stars?

Jul 16th, 2008 | By

Millions of small rock clumps are present in the space which can vary in size. It can have the size of a grain or the size of a golf ball and is made up of dust. During the earth’s revolution around the sun these small grain of dust particles strike with the atmosphere at very
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How big are galaxies?

Jul 13th, 2008 | By

There are around 10 raise to the power 71, atoms and around 10 raise to the power 81, invisible mass forming dark matter in an average galaxy. Galaxies are found in large structures known as superclusters, which themselves are massive filaments with immense voids in between. Each galaxy contains trillion stars. The Eridanus Supervoid, with
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Why does moon change shape?

Jul 13th, 2008 | By

Half of the moon is always lit by sunlight because it completes one revolution and rotation around its axis in 29.5 days and the other half is in darkness. We are able to see only that part of moon which is receiving sunlight and during its revolution the vision of sunlit area varies. Hence we
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Why is our galaxy called the Milky Way?

Jul 11th, 2008 | By

Some people believe that the name of our galaxy came from the Greeks who observed the sky and thought that it looked like the breast filled with milk and that milk was scattered in the whole sky or some baby angel has suckled and squeezed it very hard which caused the milk to spread all
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Why does the moon have craters?

Jul 4th, 2008 | By

There are many craters on the moon which are formed when something smashes on the surface and causes a dent. These craters are formed mainly because of the collision of asteroids, meteorites with the moon. They strike on surface with different speeds but the average speed is 12 miles per second or twenty kilometers per
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How did the Solar System form?

Jun 28th, 2008 | By

Sun with its eight planets, including our planet Earth forms the Solar System. Most people are taught at school about the sun, the eight planets and their characteristics. Scientists suggest that the formation of the Milky Way, and the formation of the Solar System are related to the Big-Bang theory. When the Big bang happened,
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