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science-explainer

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NASA Dark Matter: What It Is and Why It Matters

Dark matter is the invisible material that makes up most of the mass in the universe yet does not emit or absorb light in ways we can see. NASA investigates dark matter to expla...

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The Real Lightning and Thunder: How Lightning Creates Thunder and What You Actually See and Hear

Lightning is a massive electrostatic discharge that superheats the air, creating a rapid expansion and a shock wave we hear as thunder. You see lightning almost instantly becaus...

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Are aurora borealis dangerous?

Seeing the aurora borealis from the ground is not dangerous to people. You cannot be struck, burned, or physically harmed by the visible lights. At the same time, the space-weat...

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