WHAT ARE THE EFFECTS OF THE SEASONS ON MARS....?

Have you guys ever imagine about the effects of the seasons on Mars...?

The most noticeable features of the Mars are the ice caps at its north and south poles. Since Mars is tilted at about the same angle that Earth is, it has seasons, as we do. The effects of the seasons can be clearly seen in the growing and shrinking of the polar ice caps. Another seasonal change has long created an impression that there is some form of planet life in low lying areas. These areas change from blue green in summer, to brown in winter.

HOW DID THE SOLAR SYSTEM BEGIN...?

Scientists think there are two ways in which the solar system could have begun. According to the nebular theory, and the solar system was born from a great cloud of whiring gases. The attraction of gravity drew the atoms of the gas closet together. As the gas condensed into a ball, the circular motion increased. Rings of matter were left spinning around the central mass. These  condensed to form the planets, and the central ball of gas become the sun.

COULD THERE BE A COLLISION OF PLANETS....?

Are you guys afraid or fear about the collision of planets..?

Simply the answer is NO. There is no reason for such a fear. The planets and stars are so far away from each other, even though we don't realise it. Let's imagine that your own head is the Sun, both in its size and location in the solar system. Your head is then in the centre of a number of rings of different size. These rings are the orbits which the planets travel around the Sun. With your head as the centre, Mercury, revolving in the nearest ring, is six metres away from you! it is about as large as the dot at the end of this sentence.(Remember, the size of your head is the size of the Sun.)

WHY CAN YOU FIT SOUTH AMERICA AND AFRICA TOGETHER LIKE A JIGSAW PUZZLE...?

If you look  at the map of the world, you will notice that  east coast of South America fits exactly against the west coast of Africa, as if they were pieces of jigsaw puzzle. This is because millions of years ago, they were joined. In fact, 220 million years ago, all the continents were joined together to form one super continent called pangaea. There was also only one giant ocean, Panthalassa. In the time, Pangaea split into smaller land masses, and the continents began to drift towards their present positions. In the future, the movements of the tectonic plates will cause the continents to drift even more. This result in the Pacific ocean shrinking, the Atlantic ocean getting wider, and Africa splitting into two!

WHAT IS ACID RAIN...?

Do you guys know what is acid rain....?

Acid rain is rain that has a larger amount of acid in it than what is normal. Acid rain is caused by smoke and gases that are given off by factories, and vehicles that run on fossil fuels. When these fuels are burned to produce energy, the sulphur that is present in the fuel combines with oxygen and becomes sulphur dioxide. Some of the nitrogen in the air becomes nitrogen oxide. These pollutants go into the atmosphere, and become acid. Sulphur dioxide and nitrogen oxide are also produced when coal is burnt for fuel. Acid rain destroys trees, harms wildlife and eats away the stonework in buildings. It also gives us asthma  and coughs!

IS THE EARTH A PERFECT SPHERE...?

A person who thinks about the shape of Earth may have a doubt that is the Earth a perfect sphere or not...?

If you look around, the Earth looks flat. Even before the middle ages, people did think it was flat. The flat Earth concept persisted till about 300 years ago. In fact, people used to think that if they sailed too far in one direction, they would fall off the edge of the Earth! Pythagoras was the first person to talk about the Earth being spherical. A practical demonstration on Earth's sphericity was achieved by Ferdinand Magellan's  expedition's circumnavigation. It was Sir Isaac Newton, who first claimed that the Earth is not spherical, but 'oval'. Today, we know that the Earth is not a perfect sphere. It is slightly flattened at the poles, and bulges at the Equator.

WHAT IS A BLACK HOLE...?

Hi guys do you know what is a black  hole....?

Black holes are the most mysterious bodies in the whole universe. Astronomers consider a black hole as a stage in the evolution of the star. They are probably formed when a supernova occurs. If a star is ten times more massive than the sun, no known force can stop the increasing gravity, and it will collapse to a point of infinite density. Before  this stage is reached, within a certain radius, light itself becomes trapped, and the object becomes invisible, and becomes a black hole. With the invention of invisible radiations like radio waves,ultraviolet, X-rays etc. locating the  invisible black hole has been possible. Black holes are the densest areas in the Universe.