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MERCURY Mercury is the first planet from the sun and the smallest planet at the moment. Its revolution period is 88 earth days and its ration time is 59 days. Mercury is made up of core-iron-nickel alloy, mantle, and then the crust which is silicate. During the day mercury’s temperature reaches 800°F and at night it goes down to -279°F. Mercury looks similar to earth’s moon; it is covered with craters which are made from meteors, asteroids, and comets and it covers 70% of mercury. Its diameter is 3,031 miles, its mass is 5% of earth’s mass, and the sun is 6.3 times brighter. Mercury was named by the Greeks, after the messenger of their g-d. Mariner 10 visited mercury, it mapped 45% of it, and it was the only one which visited more than one planet during its mission. It went up from Cape Canaveral, Florida on November, 1973 and went to Venus in February of 1974.

Never attempt to observe Mercury or anything close to the sun with a naked eye because it can cause permanent damage. And with binoculars or telescope it is even more dangerous.

VENUS

Venus is the second planet from the sun it is called the evening star because it can be seen by sunset and also by sunrise. Venus is made up of molten metal core, mantle, and crust of various rocks and 98% of carbon dioxide with traces of nitrogen and other gases. It is the only planet that the day is longer then it’s year, it’s year is 225 earth days, and its day is 243 earth days. Venus is known as earth’s twin because of the similarity, it’s 82% of earth’s mass, and 91% of earth’s gravity. Venus is on a 178% tilt and it shines like a star at night because of the thick atmosphere that reflects the sun nicely. Venus is the hottest planet it is about 878°F it has the green house effect. Some scientists believe that there was water and it evaporated because of the heat and others think that there are jungles underneath its clouds. Venus is also known as planet of volcanoes. Visits to Venus-
• Mariner 2-December 1962 it discovered the green house effect.
• Venera 7 December 15, 1970- Russian
• Venera 8- 1972-Russian
• Venera 9-1975-Russian
• Venera 10- 1975 sent color of Venus back
• Mariner 10- 1978
• Pioneer Venus orbiter-1989-orbited Venus four times in 14 years.
• Magellan- May 1989 spent four years mapping 98% of Venus.

Earth

If an astronaut would come to earth from outer space to earth he would think it is the most interesting planet. It is the only planet with water in all three forms- solid, liquid, and gas. The only planet with living cells on it. Earth is also known as home sweet home.

MARS

Mars is known as the red planet because it shines with a reddish or orange color. The roman thought it looked like blood and war so they named it after their g-d of war, Mars. It’s a planet full of craters the biggest valley is on it, Valles Marineris it is four times as deed as the Grand Canyon. This valley stretches for almost 3,000 miles the distance from coast to coast of the USA. Mars is seven times smaller than earth. Its revolution period is 687 earth days and its rotation period is 24 hours and 39 minutes. The biggest volcano is three times higher than Mont Everest. Mars also is a dusty planet with a lot of dust storms. It has two moons and two ice caps. The temperature is between 190°F and 45°F.

VISITS TO MARS-
• Mariner 9 arrived and Mars was hidden by a dust storm.
• Vinking 1&2 went in 1975(August & September) two weeks apart from each other and it took ten weeks to get to Mars.

Bibliography

• Count down to space- Mercury-the first planet by Michael D. Cole
• Count down to space- Venus-the second planet by Michael D. Cole
• 1,000 facts on space by John Fardon
• Mars- Eymour Simon- 1987 A mulberry paper back book NY

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