If the Earth were one giant atom, the nucleus would be so small it would fit inside a baseball stadium. That means the rest of the world would just be electrons. So, if atoms are made of basically empty space, why doesn't light pass right through them? Why isn't everything and everyone transparent? And what makes some objects, like glass, see-through?

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Humans have achieved something once thought impossible: Sending a spacecraft to the sun and flying it through the outermost layer. This incredible feat will change everything we know about the star at the center of our solar system. But how did scientists and engineers manage to pull it off?

Everything from your smartphone to cordless vacuum cleaner uses a lithium-ion battery, and demand is growing as more electric vehicles hit the market. The issue is that there is only so much lithium on the earth, and we may be running out. So what does this mean for the future?

When you look at the Earth from space, you don’t see borders or people. But, NASA has one photo of the Earth that can tell you everything about humans past and present. So what is this photo, and why can it tell us so much?

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