Big Bang theory - The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!, Exoplanet - a planet that orbits a star outside the solar system., Electromagnetic Spectrum - he range of wavelengths or frequencies over which electromagnetic radiation expands. It produces invisible waves such as radio or x-rays as well as our visible light spectrum. , X-ray photos - a shadow picture made with X rays especially : one revealing the internal structure of objects that are not transparent to ordinary light. , Optical photos - the apparent reproduction of an object, formed by a lens or mirror system, Goldilocks Zone - or habitable zone, is the range of distance with the right temperatures for water to remain liquid, Drake Equation - a theoretical equation that gives an estimate of the likelihood of discovering intelligent extraterrestrial life in the galaxy, expressed as the product of a series of factors,

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