We all know the Earth revolves around the sun at about 30 km/s. We celebrate the new year every 365 days as the earth completes one revolution. But at the same time, the entire Solar system is orbiting the centre of the galaxy. It takes about 225 million years to complete one revolution around Milky way….. ……as we live on the outer edge of the galaxy. This duration is known as Galactic Year. The last time the earth was at this location, dinosaurs were beginning to walk to planet. Since Its birth, the sun has orbited the centre of the milky way 20 times. Now lets see what happened on the earth as it was going around the Milky way. 1 8 Galactic Years Ago The solar nebula, a large rotating cloud of interstellar dust and gas, formed the Earth. Somewhere between astronomical science and intimate human relationships lies the interstellar meaning. This is a story about passing through the stars and fighting for what you love at the same time. I hope you'll definitely see a film ca...
Tigers are fascinating creatures Tigers are found only in Asia. There were 100,000 tigers at the start of the 20 th century. But their numbers dwindled tremendously because they were hunted for sport. Today, there are as few as 5,000 tigers left in the wild. The tiger (Panthera tigris) is the biggest of the big cats. A fully grown tiger can be more than 3 m(10 ft) from nose to tail. A large male tiger can weigh an average of 200 kg, and a tigress an average of 150 kg. The Siberian tiger is the biggest of all tigers, and can weigh over 300 kg. Unlike other big cats, tigers are good swimmers. They like to bathe in water to stay cool. They often reverse slowly into water to keep their faces from getting wet. A tiger always hunts alone. It does not chase its prey but stalk it. Tigers use their eyes and ears, not so much their nose, to hunt. A tiger usually kills animals the size of a deer once a week, and feeds on 50-80 kg of meat. This keeps it going for a...