1. The Earth is 4.5 billion years old. Fossil records show that life began on Earth at least 3.5 billion years ago.
2. The Earth is the third planet from the sun, at a distance of 149.5 million km (92.9 million miles). Our Sun is one of 200 billion stars banded together by gravity in an enormous spiral galaxy called the Milky Way. The Earth is approximately 3/5 of the way out from the galaxy center. Light takes 100,000 years to traverse our galaxy.
3.The nearest star to our sun is Alpha Centauri which is 40 trillion km (25 trillian miles) away. On a scale model of the universe, with the Earth shown as 1.5 cm from the Sun, Alpha Centauri would appear 5.5 km (3.5 miles) away from the sun.
4. The Earth is one of nine planets orbiting the sun. Remember the order of the planets with this nonsense line:
My Very Eager Mother Just Served Us Nine Pizzas.
The capital letters stand for the order of the planets, starting closest to the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. The orbits of the planets are nearly circular (eliptical) paths around the Sun. If Pluto's path were the size of a dinner plate, the orbits of the four inner planets would fit inside a pea sitting at the center of the plate.
5. The equatorial diameter of the Earth is 12,756 km (7,926 mi). The Earth is inclined on it's axis at an angle of 23.45 deg.
6. The Earth orbits the Sun at an average speed of 29.79 km/s (18.51 miles/sec, or 67,000 miles/hour).
7. One year on Earth is 365.26 days long. One day on Earth is 23 hours, 56 minutes, and 4 seconds long.
8. No one really know how our planet came into being, but one common theory is that the earth developed form a swirling mass of rock and gas. 100 million years ago, the single landmass (called Pangaea) broke into the continents we know today.
9. The temperatures on Earth range from -88 deg to 58 deg Celsius. (-126 deg to 136 deg F.) The earth's temperature fluctuates. 100 million years ago it was 6 to 12 degrees hotter than it is today. Alligators lived in what is now ice-covered Greenland.
10. Today 71% of the Earth is covered with water, 29% by the continents. The percentage covered by water will increase as the Earth continues to warm and polar ice caps melt.
11. The Pacific Ocean is one of the largest features on the face of the Earth, with an area of more than 181 million square kilometers (approximately 70 million sq mi.) It contains half of the world's water.
12. It takes light 8 min. 20 sec to travel from the sun to the Earth. (Light travels at a speed of 3X10^5 km/sec.)
13. The velocity required to escape Earth's gravity is 11.2 km/sec.
milky way
2. The Earth is the third planet from the sun, at a distance of 149.5 million km (92.9 million miles). Our Sun is one of 200 billion stars banded together by gravity in an enormous spiral galaxy called the Milky Way. The Earth is approximately 3/5 of the way out from the galaxy center. Light takes 100,000 years to traverse our galaxy.
3.The nearest star to our sun is Alpha Centauri which is 40 trillion km (25 trillian miles) away. On a scale model of the universe, with the Earth shown as 1.5 cm from the Sun, Alpha Centauri would appear 5.5 km (3.5 miles) away from the sun.
4. The Earth is one of nine planets orbiting the sun. Remember the order of the planets with this nonsense line:
My Very Eager Mother Just Served Us Nine Pizzas.
The capital letters stand for the order of the planets, starting closest to the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. The orbits of the planets are nearly circular (eliptical) paths around the Sun. If Pluto's path were the size of a dinner plate, the orbits of the four inner planets would fit inside a pea sitting at the center of the plate.
5. The equatorial diameter of the Earth is 12,756 km (7,926 mi). The Earth is inclined on it's axis at an angle of 23.45 deg.
6. The Earth orbits the Sun at an average speed of 29.79 km/s (18.51 miles/sec, or 67,000 miles/hour).
7. One year on Earth is 365.26 days long. One day on Earth is 23 hours, 56 minutes, and 4 seconds long.
8. No one really know how our planet came into being, but one common theory is that the earth developed form a swirling mass of rock and gas. 100 million years ago, the single landmass (called Pangaea) broke into the continents we know today.
9. The temperatures on Earth range from -88 deg to 58 deg Celsius. (-126 deg to 136 deg F.) The earth's temperature fluctuates. 100 million years ago it was 6 to 12 degrees hotter than it is today. Alligators lived in what is now ice-covered Greenland.
10. Today 71% of the Earth is covered with water, 29% by the continents. The percentage covered by water will increase as the Earth continues to warm and polar ice caps melt.
11. The Pacific Ocean is one of the largest features on the face of the Earth, with an area of more than 181 million square kilometers (approximately 70 million sq mi.) It contains half of the world's water.
12. It takes light 8 min. 20 sec to travel from the sun to the Earth. (Light travels at a speed of 3X10^5 km/sec.)
13. The velocity required to escape Earth's gravity is 11.2 km/sec.
milky way
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