A #Variable #Star is a star whose brightness changes over time, either because its luminosity genuinely fluctuates or because something is periodically blocking its light.

These changes can be caused by internal processes like pulsation or external factors.

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According to Einstein's theory of special relativity, the speed of light in a vacuum is the ultimate speed limit for any object with mass or for the transmission of information.

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#DeepSeek has released two new "reasoning-first" AI models, DeepSeek-V3.2 and the more powerful DeepSeek-V3.2 Speciale, which they claim compete with models like GPT-5 and Gemini 3 Pro.

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#Airglow is a faint, steady emission of light from a planetary atmosphere, caused by atoms and molecules in the upper atmosphere releasing energy they absorbed from sunlight, primarily through photochemical reactions.

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#Cosmic #History describes the universe's evolution from the Big Bang about 13.8 billion years ago to the present.

Key events include rapid inflation of space, formation of the first particles, the creation of light elements, the formation of the first atoms,...

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