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As you travel over the surface, your instruments detect large quantities of nitrogen-rich soil. You need to reach the planet's core by flying into the largest opening. Which shape is the largest opening?

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Interesting fact:

What is a light-year, exactly? It's the distance covered by light in a single year. Pretty straightforward, right? But get this: Because light moves at the speed of about 186,411 miles (300,000 km) a second, a light year is approximately 5,903,026,326,255 miles!

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