Understanding Depression

 

Our Close Proximity Prevents us From Seeing Earth in its Entirety

To completely view our own planet, we must leave its surface and journey into space. From the vantage point of space we are able to observe our planet globally, as we do other planets, using similar sensitive instruments to understand the delicate balance among its oceans, air, land, and life. Viewing Earth from the unique perspective of space provides the opportunity to see Earth as a whole. Scientists around the world have discovered many things about our planet by working together and sharing their findings.

Earth Has One Natural Satellite

Earth's Moon (called Luna) orbits at a distance of 384,000km, with a radius of 1738KM and a mass of 7.32e22kg. However, there are thousands of small artificial satellites which have been placed in orbit around the Earth. Also, asteroids 3753 Cruithne and 2002 AA29 have complicated orbital relationships with the Earth; they're not really moons, the term "companion" is being used.

Because of its size and rocky composition, the moon has also been called a terrestrial planet along with Mercury, Venus, Earth, and Mars. It has no atmosphere, but there is water ice in some deep craters. The moon is the only extra-planetary body that a human has visited.

Early Philosophy had the Earth as the Center of the Universe

Although Aristarchus of Samos, in the 3rd Century B.C., figured out how to measure the distances to and sizes of the Sun and the Moon, and concluded that the Earth orbited the Sun, this view didn't attract followers until Nicolaus Copernicus, a Polish astronomer, published "On the Revolutions of the Celestial Spheres" in 1543.

 

Earth is the Fifth Largest Planet

The diameter of the earth at the equator is about 7926 miles, but that's not the whole story. Because the earth is not a perfect sphere but is slightly flattened at the poles, the diameter of the earth measured around the North Pole and the South Pole is about 7899 miles.

Google More Popular Than Yahoo

• Google overtook Yahoo as the second most popular Internet destination for Web surfers worldwide in November while Microsoft held on to the top spot, ComScore has reported. Slightly more than 736 million people around the world traveled the Internet last month, with 475,713 of them visiting Google websites and 475,262 going to Yahoo online properties, according to industry tracker ComScore.

• Websites of Redmond, Washington-based software giant Microsoft were visited by 501,720 people, the rating tally revealed. Hot video-sharing website YouTube placed tenth in the ComScore Media Metrix rankings but showed the largest surge in visitors, with the number catapulting by more than 2,000 per cent to 107,944. Google's results did not include visits YouTube, which it bought in October. The popularity of Google websites was up nine per cent from the same month a year earlier, while visits to Silicon Valley rival Yahoo grew by five per cent and to Microsoft by three per cent in the same comparison.  

• Online auction pioneer eBay was ranked in fourth place, with the number of visitors slipping by one per cent from November of 2005 to 250,848. Time Warner Network site visits also notched down one per cent, tallying 222,107. The number of people going to the communally-edited Internet encyclopedia site Wikipedia more than doubled to 171,945 in November as compared to that month last year.