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[杨宏峰]行星科学新闻四则

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JO_Editor1 发表于 2012-7-28 06:58:15 | 显示全部楼层 |阅读模式
本帖最后由 JO_Editor1 于 2012-7-28 07:02 编辑

1. The Tides of Titan (链接:http://www.joyocean.org/home.php ... do=blog&id=2061

Following the posts yesterday, I saw this article coming out of Science today. Following is the abstract.

We have detected in Cassini spacecraft data the signature of the periodic tidal stresses within Titan, driven by the eccentricity (e = 0.028) of its 16-day orbit around Saturn. Precise measurements of the acceleration of Cassini during six close flybys between 2006 and 2011 have revealed that Titan responds to the variable tidal field exerted by Saturn with periodic changes of its quadrupole gravity, at about 4% of the static value. Two independent determinations of the corresponding degree-2 Love number yield k2 = 0.589 ± 0.150 and k2 = 0.637 ± 0.224 (2σ). Such a large response to the tidal field requires that Titan’s interior be deformable over time scales of the orbital period, in a way that is consistent with a global ocean at depth.

2. The final competition-Listen to Mars, splash down on Titan or hop on a comet? (链接:http://www.joyocean.org/home.php ... do=blog&id=2057

The final three in the competition:

- Listen to Mars (the INSIGHT mission), or

- Splash down on Titan (the TiME mission), or

- Hop on a comet (the CHOPPER mission)

3. Past missions (链接:http://www.joyocean.org/home.php ... do=blog&id=2059

As Discovery missions have become more infrequent, their cost and complexity has grown.

4. NASA set to choose low-cost Solar System mission (链接:http://www.joyocean.org/home.php ... do=blog&id=2058

With less-frequent selections, proposers worry about rising costs and complexity.
SunZhen 发表于 2012-7-28 09:12:07 | 显示全部楼层
关于天文学研究的进展报道,让我们知道科学家们进行到什么深度了。希望中国的天文学报道也能多些关于研究的,让我们知道我们国家进展到什么深度了。
滚滚长江都是水 发表于 2012-8-22 03:22:38 | 显示全部楼层
还记得几周前的投票吗?NASA决定再上火星!!

2016年的时候我们可以期待火星震了,因为会有seismometer上去。

http://www.bbc.co.uk/news/science-environment-19327286

Just two weeks after landing its Curiosity rover on Mars, the US space agency has announced it will send another robot to the planet in 2016.
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