The Earth could enter a new 'Little Ice Age' in the coming years due to low solar activity, astronomers believe.

由于太阳活动性下降，天文学家们相信在未来的几年内，地球可能将进入新的小冰河时期。

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So anyone over the age of 11 has already lived through such a solar maximum, with no harm, according to NASA.

因此，11岁以上的人已经经历过这样一个太阳活动峰年，美国宇航局表示不会有任何损害。

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That, then, is the age of the solar system.

那么这就是太阳系的年龄。

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Now it is the centre of a space race to mine rare minerals to fuel our future - smart phones, space-age solar panels and possibly even a future colony of Earthlings.

BBC: What if you could mine the Moon?

We have basically the building blocks of the solar system preserved in this sort of cosmic library, if you will, for the entire age of the solar system and preserved at very low temperatures.

NPR: Stardust Set to Deliver Comet Samples

But part of the problem with the definition - I mean, as an example - is that if you look at Mars - if Mars - if we discovered a Mars-sized object out beyond the orbit of Pluto, it couldn't be a planet, because over the age of the solar system it wouldn't have time to clear its orbit.

NPR: Astronomers Prepare to Fight Pluto Demotion