Until this week Saturn's small moon Rhea was the only known solid space object thought to have a ring. (Other known ringed bodies, such as Saturn, are mainly gaseous.)

直到本周土星的小卫星土卫五还被认为是唯一具有环的立体空间物体。(其它已知有环的天体，例如土星，大部分是气态的。)

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The process can usefully be thought of in terms of the gradual emergence of two somewhat separate features: the self as a subject, and the self as an object.

这一过程会逐渐形成两种稍有不同的特征：主体自我和客体自我。

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If you think about an object, you have a thought, not an object.

如果你在思考某一个对象时，你大脑里只有一个思想，而不是一个对象。

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However, the monks - who carried out "one-point" meditation, where they focus attention on a single object or thought - were able to focus on one image.

BBC: NEWS | Health | Meditation 'brain training' clues

Apophis is some 350 metres across, considerably larger than the object that is thought to have flattened 2, 000 square kilometres of Siberian forest as it vaporised in the atmosphere above Tunguska in 1908.

ECONOMIST: Private efforts to avert disaster in space

While 1km-size and bigger asteroids are thought to hit only once every 500, 000 years, on average, rocks 50-100 metres across, like the Tunguska object, are thought to hit the planet once every thousand years.

ECONOMIST: A large asteroid sweeps by Earth. Where are the others?