Is Sedna a planet?

赛德娜是行星吗？

youdao

And if so, why not Quaoar and Sedna, and several other worlds, which were smaller than Pluto, but not by much?

而且如果这样的话，为什么夸欧尔、塞德娜及其它星体不是呢？它们比冥王星小些，但没小那多。

youdao

Perhaps a massive unseen object is responsible for Sedna's mystifying orbit, its gravitational influence keeping Sedna fixed in that far-distant portion of space.

也许一颗大质量的未被观测到的天体应该对“赛德娜”那令人迷惑的轨道负责。它的引力影响让“赛德娜”固定在遥远星空中的那个位置上。

youdao

Raj Rajaratnam was deposed in the Sedna probe, and Galleon was ultimately drawn into the investigation.

WSJ: Rajaratnam's Brother Arraigned

The SEC hasn't filed charges in the Sedna investigation, but the probe is continuing.

WSJ: Another Rajaratnam Named in Ring

Sedna closed in 2007, and Rengan Rajaratnam went to work at Galleon.

WSJ: Another Rajaratnam Named in Ring