Smallest Planets; update: exoplanet - Gliese 581e
Saintis Sepanyol dakwa temui planet terkecilMADRID: Ahli kaji bintang Sepanyol mengumumkan bahawa mereka menemui sebuah planet terkecil di luar sistem solar pada jarak 30 tahun perjalanan cahaya dari bumi.
Ahli Sains Sepanyol, Ignasi Ribas dari pusat penyelidikan Saintifik Sepanyol berkata planet yang dikenali GJ 436T dikesan menerusi teknik baru yang akan membolehkan kami menemui planet pertama menyerupai bumi dari segi pergerakan dan orbit dalam tempoh 10 tahun lagi.
Beliau berkata, planet itu dikesan kumpulan diketuainya menerusi tarikan graviti pada planet lain yang dikenal pasti dalam kumpulan bintang sama dengan bintang Leo.
揋J 436T diorang ckp jupak planet jupak planet tp x pnh tunjuk bukti pon, aku pon bleh ckp aku jupak tiba2 di suatu malam aku tlah menjupai sebuah planet kecil!!
tp siapa la nak pcy kn aku, siapalah aku.. :(
:lol: :lol: 30 tahun cahaya....itu dah keluar dari Sistem Suria...memang takleh kira ahli keluarga Bumi la.... wa ada gamba x... Wednesday April 22, 2009
Smallest exoplanet found in search for Earth's twin
By Alexia Vlahos
http://www.scientificblogging.com/files/images/gliese%20581%20e.jpg
By refining the orbit of the planet Gliese 581 d, first discovered in 2007, a team of astronomers has shown that it lies well within the habitable zone, where liquid water oceans could exist. This diagram shows the distances of the planets in the Solar System (upper row) and in the Gliese 581 system (lower row), from their respective stars (left). The habitable zone is indicated as the blue area, showing that Gliese 581 d is located inside the habitable zone around its low-mass red star. Based on a diagram by Franck Selsis, Univ. of Bordeaux.
SANTIAGO (Reuters) - Scientists searching for a planet like Earth said on Tuesday they have found the smallest planet ever detected outside the solar system, less than twice the size of our own.
The exoplanet, a planet that orbits a star beyond the solar system, is called Gliese 581e after the star it circles. Because of its relatively small size it is likely rocky, like Earth, as opposed to gas giants such as Jupiter or Saturn, the astronomers said.
"It is the lightest planet detected outside the solar system so far," Dr. Gaspare Lo Curto, an astronomer at the European Organization for Astronomical Research in the Southern Hemisphere, told a news conference.
"We are not too far away from finding a planet like Earth," he added.
Gliese 581e orbits its star in just 3.15 days, but lies outside a so-called "habitable zone" and could not sustain life, Lo Curto said. Its mass is just 1.9 times that of Earth, and it is 20.5 light years away.
But while the small planet is outside the habitable zone, the biggest of three other previously discovered planets in the same system appears to be inside this just-right zone.
"The most outlying planet is inside what is defined as a habitable zone, which is a zone where there could be water in a liquid state on the surface of the planet," Lo Curto said.
The international team of researchers used a 3.6 meter telescope at the Paranal Observatory in La Silla, 600 km north of Chile's capital Santiago. Their findings are also being presented to an astronomical meeting this week in Britain.
Around 340 exoplanets have so far been found orbiting other stars besides the Earth's sun, most of them gas giants with characteristics similar to Jupiter and Neptune.
Balas #5 amazed\ catat
chantek gmbr matahari tue...:loveliness: Originally posted by amazed at 13-4-2008 11:04 http://mforum5.cari.com.my/images/common/back.gifsatu aje aku nak sentuh.. berapa banyak kali daaa ckp jumpa planetterkecil..cakap jumpa planet baru dah lerr.. maner nak compare lagi...
Planet luar sistem suria terkecil yang telah dijumpai setakat ini. Kejayaan ini bukan pasal planet tu, tapi pasal peningkatan kebolehan atau kemampuan kita menemui planet-planet baru. Semakin kecil planet di luar sistem yang kita temui maknanya ilmu dan teknologi kita dalam hal ini semakin maju. Seterusnya kita berharap untuk menemui planet yang berkeadaan seperti bumi dan meningkatkan kemungkinan kita menemui pula kehidupan di planet lain atau kita sendiri boleh berhijrah ke sana. Setakat ini planet-planet luar yang ditemui bersaiz giant dan saintis suspek semuanya merupakan planet-planet gas seperti musytari atau zuhal yang tak sesuai untuk kehidupan. Mereka berusaha keras untuk mencari planet yang lebih kecil dalam kedudukan yang sesuai untuk menampung kehidupan. Jadi setiap kali mereka berjaya menemui sesuatu yang lebih kecil dari sebelumnya adalah satu kejayaan atau peningkatan dan wajar mereka seronok dan bangga. Mereka kerja keras. Kita tau komen saja. Banyak beza tu.
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