by eturo
Kung ating susuriin, ang ating planetang Earth ang tanging planeta sa buong Solar System or maging sa buong Universe ang may BUHAY. Ibig sabihin nito, lahat ng may buhay ay dito nakatira: tao, hayop, halaman, at maging mga maliliit na mga nilalang tulad ng bacteria at mga insekto. Sa pagdaan ng maraming taon at centuries, di natin namamalayan na ang bilang ng nilalang (pati rin AKO) na nabubuhay sa Earth ay parami ng parami. Kung ating tatanungin, what is the exact or rather approximate number of population of the world?
In fact, according to the United Nations (UN), in the book "2010 Revision of the World Population Prospects", world population has reached 7 BILLION on October 31, 2011. Ganyan na tayo karami sa ngayon. In addition, world population had reached 6 BILLION noong 1999 lang. Then after 12 years, according to the United Nations the 6 billions figure was reached on October 12, 1999 (celebrated as the Day of 6 Billion). So, when will world population reach 8 BILLION? According to the same source, it will happen that by the year 2027.
I have read an article from yahoo website that beyond our Solar System, there is an earth-sized planets discovered. Here is the whole article that I want to repost here in my blog.
First Earth-Sized Planets
By Irene Klotz | Reuters – Wed, Dec 21, 2011
Astronomers have found a pair of Earth-sized planets orbiting a star similar to the sun, though neither are believed to be suitable for life, scientists on NASA's Kepler telescope team said on Tuesday.
The discovery follows confirmation earlier this month of a super-Earth sized planet, called Kepler-22b, that circles the right distance from its parent star for liquid water to exist on its surface. Water is believed to be a key ingredient for life.
"Kepler-22b has the right temperature, but it is too big. (The planets) we're announcing today are just the right size, but too hot," astronomer David Charbonneau with Harvard University, told reporters during a conference call.
"But you can bet that the hunt is on to find a planet that combines the best of both worlds, a true Earth twin," he said.
The newly discovered planets, called Kepler-20e and 20f, have at least three gas-giant siblings, one of the larger planetary systems found to date.
But the family is nothing like our solar system, where rocky worlds like Venus, Earth and Mars are grouped together closer in toward the sun while gas giants like Jupiter and Saturn are segregated in the outer regions.
The two Earth-like and three Neptune-sized planets in the Kepler-20 family are interspersed and all orbit closer to the parent star than our solar system's innermost planet, Mercury.
"Rocky planets and gas giants happily mingle together. This is the first time we've seen anything like this," Charbonneau said. Kepler-20e and 20f, which are believed to be too hot for liquid water, probably are not habitable - at least not today.
"If Kepler-20f was formed with water, which I think is likely, then it could have held on to its water for several billions of years ," said astronomer Linda Elkins-Tanton with the Carnegie Institute in Washington D.C. "And that means that this planet could have been habitable in the past for a long period," she said.
The system is located about 1,000 light-years away in the constellation Lyra. Light travels at about 299,337 km per second.
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Now, kung sa hinaharap ay mapupuno ang Earth ng taon (hindi malayong mangyari ito), saan kaya tayo ilalagay? Saan pa kaya titira ang mga susunod na henerasyon?
