This Day in History

Wednesday, June 18, 2008

The largest Canyon in Mars

Huge valleys can survive for millions of years in Mars since there is no running water to wear away the rocky landscape.

The Valles of Marineris (Mariner Valleys) is the largest canyon, it was discovered by the space probe Mariner 9.

This valleys was most likely caused by erosion. It is 4,000 kilometers long and four times as deep as the Grand Canyon in the United States.

Friday, June 13, 2008

The Ice of Saturn

Shining rings of Saturn are actually tiny chips of ice, rock and dust sorrounding the planet. The rings reflect light and often is seen through from the earth.

Thursday, June 12, 2008


Conditions in the Planet Venus are too extreme for life. Though in the early times writers thought that life could have existed in the planet.

A study on the said planet showed that its atmosphere is mostly poisonous carbon dioxide and sulphuric acid. Is surface cannot be seen due to its thick atmoshphere. However, enough sunlight penetrates the planet and raises the temperature to 480 degrees centigrade.

Due to its atmosphere, the sun's light is reflected making the planet appear very bright when viewed from Earth.

Friday, May 9, 2008

The Red Planet - Mars

Mars is covered by a stormy desert that contains lots of iron oxide. This is the reason why it appears like a rusty red colour planet.

One time, Mars had an atmosphere which contains oxygen, it has valleys that water may have flowed. As of the present, the oxygen are locked up in the rusty iron deposits.

Monday, May 5, 2008

The Inner Planets

The Inner Planets are the four planets that are nearest to the sun. Namely, Mercury, Venus, Earth, and Mars. They are basically different from sun considering that they are made of rock.

The planets farther away from the sun are mostly composed of gas. Each of the inner planets has an atmosphere. Though the atmosphere of the other inner planets are very thin and would be poisonous to humans.

Sunday, May 4, 2008

The Planet Mercury

The closest planet to the sun is Mercury. Based on studies the temperature of the planet facing the sun is as high as 430 degrees centigrad. Though the other side is literally cold at -180 degrees centigrade.

Mercury has no atmosphere because it has been burned off by the sun.

Saturday, May 3, 2008

The Black Hole

A black hole is an area in space where the force of gravity is so strong that even light cannot escape from it. Usually, black holes are created when burned out stars collapse. It will shrink into a tiny shere of material which gravity is so strong that it pulls everything around it.

Even light is sucked into it. Nothing that goes into the black hole comes out of it. Black holes cannot be seen, but sometimes they can be identified through the radio waves given off when a star is drawn into the black hole
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