Deep-blue planet differs from Earth
Hubble measured the visible-light color of HD 189733b: cobalt blue, extremely hot, and nothing like our oceans.
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Supercooled water transforms
A 2013 simulation supported the idea that deeply chilled water can shift between two liquid forms.
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What causes lightning?
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Lightning is an electrical discharge. Collisions inside a storm cloud separate electric charge; when the difference becomes large enough, electricity moves through the air within a cloud, between clouds, or between a cloud and the ground.
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Start with the famously fizzy baking-soda volcano and learn what makes it work.
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