Sunday, April 12, 2009
Aurora, also called as northern lights phenomenon or southern lights phenomenon, are natural light displays in the sky, usually observed at night, particularly in the polar regions.They are most commonly observed in Alaska, Canada and Sweden.
They are produced by the collisions of Solar wind (gas of free electrons and positive ions emitted by the Sun in all directions) with the earth's magnetic field.This interaction in the atmosphere electrically excites the electrons which emit energy in the form of visible lights.Most Aurorae are green and red emissions from atomic oxygen. Molecular nitrogen and nitrogen ions produce some low level red (pink) and very high blue/violet aurorae.The light blue and green colors are produced by ionic nitrogen and the neutral helium gives off the purple colour whereas neon is responsible for the rare orange flares with the rippled edges.
Read full article at Wikipedia.
Tuesday, April 07, 2009
Zebras can only see black and white.
Anacondas can engulf an Antelope as their jaws can open up to 180°.
When lions attack a herd in a group, they form a circle around them and block all the exits.
Lions mate after every 15 min during their mating season.
Running in front of big cats provokes their hunting behavior.
Cheetah meals are often stolen by Hyenas. They can also out number lions in 3:1 ratio and snatch their meals.
Hyena’s screams are heard in 3 miles.
Wild dogs are renamed to hunting dogs to remove their hatred from people hearts.
Firefly also uses its light to attract males of other species and when they come near her, she attacks them and starts to enjoy her meal. (Thank God this does not happen in humansJ.)
Japanese Macaques (monkey specie) are the cleanest animals on earth. In addition to enjoying each other lice’s, they also take bath every day.
Wolves’ howls don’t echo.
