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標題: Astronomers Discover 18 Huge New Alien Planets [列印本頁]

作者: hellman 時間: 2011-12-6 04:02
標題: Astronomers Discover 18 Huge New Alien Planets
本帖最後由研究於 2011-12-6 05:17 編輯

Astronomers Discover 18 Huge New Alien Planets

Astronomers have found 18 new alien planets, all of them Jupiter-size gas giants that circle stars bigger than our sun, a new study reports.

The discoveries increase the number of known planets orbiting massive stars by 50 percent. The exoplanet bounty should also help astronomers better understand how giant planets form and grow in nascent alien solar systems, researchers said.

The haul comes just a few months after a different team of researchers announced the discovery of 50 newfound alien worlds, including one rocky planet that could be a good candidate for life. The list of known alien planets is now well over 700 and climbing fast.

Staring at 'retired' stars

The researchers surveyed about 300 stars using the Keck Observatory in Hawaii and instruments in Texas and Arizona. They focused on so-called "retired" type A stars that are at least 1.5 times more massive than our own sun.

These stars are just beyond the main stage of life — hence the name "retired" — and are now ballooning out to become what's known as subgiant stars.

The team scrutinized these stars, looking for slight wobbles caused by the gravitational tug of orbiting planets. This process revealed 18 new alien worlds, all of them with masses similar to Jupiter's. All 18 planets also orbit relatively far from their stars, at a distance of at least 0.7 times the span from Earth to the sun (about 93 million miles, or 150 million kilometers). [Gallery: The Strangest Alien Planets]

Planet-formation theories

In addition to boosting the ever-growing alien planet tally, the new finds lend support to one of two theories that attempt to explain the formation and evolution of planets, researchers said.

This theory, called core accretion, posits that planets grow as gas and dust glom onto seed particles in a protoplanetary disk. Core accretion predicts that the characteristics of a planetary system — the number and size of planets, for example — depend strongly on the mass of the star.

The main competing theory, called gravitational collapse, holds that planets form when big clouds of gas and dust in the disk spontaneously collapse into clumps that become planets. According to this idea, stellar mass should have little impact on planet size, number and other characteristics.

As the exoplanet finds pile up, it seems that stellar mass does in fact play an important role. The 18 huge newfound alien worlds, which all orbit massive stars, add more evidence in support of core accretion, researchers said.

"It's nice to see all these converging lines of evidence pointing toward one class of formation mechanisms," study lead author John Johnson, of Caltech in Pasadena, said in a statement.

Johnson and his colleagues reported their results in the December issue of the Astrophysical Journal Supplement Series.

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•Top 10 Extreme Planet Facts

http://news.yahoo.com/astronomer ... nets-211802669.html

NASA finds planet that's just about right for life

http://news.yahoo.com/nasa-finds ... life-180545298.html

作者: 青貝殼 時間: 2011-12-6 15:28
你想說什麼？

如果想了解更多有關這方面的詳情，我建議你去看看這個系列：

歷史頻道.遠古外星人.History.Channel.Ancient.Aliens.S01E01.The.Evidence.2010

作者: hellman 時間: 2011-12-6 21:28
這是NASA這幾天的重大發現，不是SIFI。問題是上面有沒有耶穌？每個有生命的星球都有個耶穌嗎？

我的問題被刪了，因為研究嚇壞了，可能這就是基督教的終點站了。

作者: hellman 時間: 2011-12-6 21:39
http://news.yahoo.com/nasa-teles ... zone-162005358.html

這次是CONFIRM了以前的假設。2006年發射的天文望遠鏡，最近得到結果。

作者: 青貝殼 時間: 2011-12-7 15:29

hellman 發表於 2011-12-6 21:28
這是NASA這幾天的重大發現，不是SIFI。問題是上面有沒有耶穌？每個有生命的星球都有個耶穌嗎？

我的問題 ...

這個問題嘛，是這樣的，耶穌現在肯定不在有生命的星球上，在天國里。至於什麼時候再蒞臨有生命的星球，祂自己也不知道，只有耶和華知道。

作者: hellman 時間: 2011-12-8 01:06
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作者: 青貝殼 時間: 2011-12-8 10:34

hellman 發表於 2011-12-8 01:06
也許其他星球也有個耶和華，耶穌，基督教，。。。。。。。。也是唯一創造宇宙的真神。因為這一個只在中東 ...

說得對！比如說18個有生命的星球都崇拜耶和華、耶穌、基督教，那豈不是剛好證明了這個耶和華的偉大？但耶和華、耶穌不一定住在那些有生命的星球上，也是在他們認為的天上。

歡迎光臨倍可親 (https://big5.backchina.com/)