Black holes are regions of space-time that prevent anything, including light, from escaping. The reason for this is that black holes are extremely dense and so the escape velocity required to escape the black hole must be huge. It should be made clear that a black hole is a distortion of space-time (Einstein had described…
A volcano is a vent in the earth from which molten rock and gas erupt. The molten rock that erupts from the volcano forms a hill or mountain around the vent. The lava may flow out as a viscous liquid or it may explode from the vent as solid or liquid particles. Kinds of Volcanic…
The PLO was set up in 1964 by an Arab League decision in response to growing signs of Palestinian unrest. The Palestinians desired to reclaim the lands occupied by Israel, which they felt belonged to them, as said in the Bible. In 1964 the Arab states created the Palestine Liberation Organization (PLO). While it was…
Hurricanes get their start over the warm tropical waters of the North Atlantic Ocean near the equator. Most hurricanes appear in late summer or early fall, when sea temperatures are at their highest. The warm waters heats the air above it, and the updrafts of warm, moist air begin to rise. Day after day the…
Iron in its pure state is soft, malleable and ductile (that can be stretched, drawn or hammered thin without breaking ((Webster’s Dictionary, 419, 1988)) with a hardness of 4-5. It is easily magnetized at room temperatures and this property disappears when heated above 790 degrees Celsius.. Metal iron occurs in a free state in only…
All black holes are formed from the gravitational collapse of a star, usually having a great, massive, core. A star is created when huge, gigantic, gas clouds bind together due to attractive forces and form a hot core, combined from all the energy of the two gas clouds. This energy produced is so great when…
Formation: Differences between disk and halo: –Orbits of stars, ages of stars, the metal contents in stars, and the amount of gas and dust are all different Current theory suggests that the Galaxy formed from an enormous cloud of gas (the Protogalactic Cloud) The halo and the first generations of stars formed as this cloud…