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小木虫论坛-学术科研互动平台 » 科研生活区 » English Cafe » Today‘s news » Everyday News-Diamond Planet Orbits a Pulsar
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lion1998

金虫 (正式写手)

[交流] Everyday News-Diamond Planet Orbits a Pulsar

Astronomers have discovered the densest extrasolar planet yet: A Jupiter-mass remnant of a carbon- and oxygen-rich star that measures no more than 55,000 kilometers across. The odd world, whose density is on average at least 23 grams per cubic centimeter (or about twice that of lead), is probably crystalline and possibly largely composed of ultradense diamond. The planet orbits its parent sun—a pulsar, or a rapidly-spinning neutron star that emits an intense beam of radio waves, dubbed PSR J1719-1438—once every 2 hours and 10 minutes, the researchers report online today in Science. The planet’s orbit measures about 600,000 kilometers across, only 50% more than the average distance from Earth to the moon. How such a dense planet formed is unclear, the researchers say, but it’s probably the crystalline vestige of a white dwarf star whose atmosphere was stripped away by the parent pulsar. Most of the pulsars that spin faster than once per 20 milliseconds are part of a binary star system, but about 30% have no companions whatsoever, the scientists note. Only one other rapidly-spinning pulsar is known to be orbited by Earth-mass planets—a sign that exotic planets such as this megadiamond are, like their Earthly counterparts, rare indeed.
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Iamaleafonthewind.
1楼 2011-09-06 18:43:53
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WG222

木虫 (正式写手)
★
小木虫(沙发+1，金币+0.5):恭喜抢个沙发，再给个红包
Wow, I like diamonds.
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2楼2011-09-06 18:50:48
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潇湘子博客
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小木虫(金币+0.2):抢了个小板凳，给个红包
3楼2011-09-06 18:53:33
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lion1998

金虫 (正式写手)
If I have Enterprise, I will bring the whole planet back and make sure everyone have a wonderful jewellery he/she could ever imagine.
Well, at least no one would ever pay too much on their engagement ring.
Parhaps it will be a new fashion to give a wood ring.
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Iamaleafonthewind.
4楼2011-09-06 19:10:20
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sgh_119

至尊木虫 (职业作家)
diamond
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5楼2011-09-06 19:28:23
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wry3300

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nice picture~~
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此树是我栽，此路是我开，手中一支笔，管挖不管“填”——果果哥
6楼2011-09-06 23:54:14
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lion1998

金虫 (正式写手)
引用回帖:
6楼: Originally posted by wry3300 at 2011-09-06 23:54:14:
nice picture~~

well, nice planet~~
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Iamaleafonthewind.
7楼2011-09-07 00:37:23
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yinjuanchen

铁杆木虫 (著名写手)
Very odd. The article is a little difficult and I just catch its mean roughly.
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闭关，写写写
8楼2011-09-07 07:24:38
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ljason
9楼2011-09-07 18:23:20
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