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Saturn is the second biggest planet in the solar system.

土星是太阳系的第二大的行星。

《柯林斯英汉双解大词典》

But last month,a computer programmer from Australia made an exciting discovery of an unusual event in Earth's solar system.

VOA: special.2009.08.25

In that event,astronomers were able to observe the icy comet long before it struck the solar system's biggest planet.

VOA: special.2009.08.25

Mars Day at the Smithsonian Air and Space Museum in Washington is a celebration of our solar system's most famous planet.

VOA: special.2010.07.28

In fact, I'm seeing that this discussion that we're talking about - the international discussion on planetary characteristics - will have wonderful opportunities for the public to, you know, watch and to learn about what we know about our own solar system, what we know about planetary bodies within the solar system.

NPR: Astronomers Prepare to Fight Pluto Demotion

Anne Lauvergeon, chief executive of the French nuclear giant Areva, hinted last week during a meeting in Forbes offices that Areva is developing a hybrid solar power plant concept that combines a solar thermal system with solar photovoltaic (PV) panels.

FORBES: Solar Thermal or Solar Photovoltaic? Areva Says 'Both!'

Cheng says the comet is likely making its first visit to the inner solar system from the Oort cloud, a reservoir of hundreds of millions of comets encircling our solar system at a distance of about a light year.

FORBES: Budgets Nudge NASA Toward Balloon-Based Planetary Science: First Target? Comet ISON