In daytime, we sit here and we see a blue sky. Well, why does the sky have any color at all? It's because sunlight, when it hits the particles in the air, selectively scatters blue light from the sunlight. And that happens at an extreme level at sunset. So much blue is taken from the sun that the sun looks red or amber at sunset. That's not the ac
Earth's magnetic shield has lost about 30% of its strength in just 3,000 years, and scientists think this might be the start of something big, a complete flip of our magnetic poles. Here's what's happening. Deep inside Earth, churning liquid metal creates our magnetic field, protecting us from harmful space radiation. But this field isn't stable.
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