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Universe

Why does the moon have craters?

Sep 27th, 2008 | Category: Universe

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 …



Why there is no life on the moon?

Sep 21st, 2008 | Category: Universe

Moon is a natural satellite of earth but life on the moon is not possible as on the earth because of many reasons.
Firstly there is no water on the moon which is the first and foremost requirement for the life. …



What are planets made of?

Aug 28th, 2008 | Category: Universe

Planets are the bodies that revolve around the sun. These bodies do not give enough light to be seen by our eyes but sometimes we see the planet because the light of sun falling on them gets reflected and reaches …



How far are stars?

Aug 27th, 2008 | Category: Universe

Have you ever thought that the beautiful twinkling stars in the night are how much far from us? And answer for this is that it is very much away from our planet. The distance of the stars are not measured …



What are shooting stars?

Aug 26th, 2008 | Category: Universe

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 …



How do stars form?

Aug 23rd, 2008 | Category: Universe

Stars are the beautiful objects seen in the sky but what makes them beautiful? What are they made up of?
Stars emerge from the dust clouds that are present in all galaxies. The great disturbance and movement deep within the dust …



How many stars are there in universe?

Aug 22nd, 2008 | Category: Universe

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 …



Why do we have day and night?

Aug 19th, 2008 | Category: Universe

Everyday we go through day and night and many times think that why it happens.
This is because earth rotates on its own axis. This axis is an imaginary line that passes through the North Pole and South Pole of the …



How old is earth?

Jul 28th, 2008 | Category: Universe

From different researches and evidences the age of earth is approximately 4.55 billion years. Some of the sedimentary rocks found in North America, Africa, Asia, Greenland and Australia are nearly 3.8 billion years old and gave minerals that are of …



Why do planets circle the sun?

Jul 22nd, 2008 | Category: Universe

The first and foremost reason for why all planets move around the sun is that sun has very strong gravitational force and makes the planets to move around it Just as the moon revolves around the earth because of earth’s …



Why is the sun yellow?

Jul 22nd, 2008 | Category: Universe

Sun is made up of gases mainly like hydrogen, helium and small amount of other elements like sulphur, magnesium, carbon, neon, iron, oxygen, nickel, chromium and calcium. Temperature on the surface of sun is approximately 5780K giving the sun white …



Why is our galaxy called the Milky Way?

Jul 21st, 2008 | Category: Universe

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 …



How was the earth formed?

Jul 12th, 2008 | Category: Universe

It is believed that the earth was formed nearly 4.6 billion years ago from nebula, a cloud of dust particles and gas. Sun stars and all other planets are formed in a same way. So millions of years ago a …



How was the moon formed?

Jul 11th, 2008 | Category: Universe

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 …



How was the universe created?

Jul 11th, 2008 | Category: Universe

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 …



Why do we have leap year?

Jun 29th, 2008 | Category: Universe

We know that leap year occurs after every four years. Earth revolves around the sun in 365 days, five hours, 48 minutes and 46 seconds but we take one year of 365 days. There is still five hours left for …



Why does moon change shape?

Jun 27th, 2008 | Category: Universe

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 …



Why does the moon turn red?

Jun 27th, 2008 | Category: Universe

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 …



Why do we se only one side of moon?

Jun 26th, 2008 | Category: Universe

Moon is the natural satellite of the earth which orbits around the earth in about 29 days.
We see only one side of moon this is because of gravitational tides. Earth and moon exert tidal forces on one another. …



Why does earth rotate?

Jun 26th, 2008 | Category: Universe

It is believed that the earth is made up of cloud of gas and dust particles called nebula that collapses under its own gravity and started spinning. When this cloud and dust particle condensed they remained in rotation and the …