youdao

If a rocky planet is big enough - say, 10 times the mass of Earth - it can vacuum up so much hydrogen that its atmosphere ends up constituting most of the planet.

如果一个由岩石组成的行星足够的大——比方说，质量是地球的10倍——它可以吸收如此多的氢，以至于他的大气层最终会形成大部分的行星。

youdao

But with a fifth planet, the simulations produced familiar solar systems 10 times more often.

但是加入第五个行星后，模拟10多次都重新了我们所熟知的太阳系。

youdao

It has also scanned the surface of the planet using Mola (Mars Orbiter Laser Altimeter), which beams an infrared laser pulse towards the surface of the Red Planet 10 times a second.

BBC: New view of giant Martian volcano

The planet orbiting Kepler 10, by contrast, has an orbital period of a mere 20 hours and is so dense that it is probably made of iron.

ECONOMIST: The search for other Earths is hotting up

The best starting point is " Lonely Planet's top 10 Hawaiian vistas", a survey of the best spots across Maui , O'ahu and the Big Island where you will take the obligatory perfect photo and explore from there.

BBC: This is Hawaii week