Exoplanets are planets outside our solar system.So far, astronomers have identified 4,800 planets orbiting other stars in our own Milky Way galaxy. They are all about 3,000 light-years from Earth. But for the first time, NASA has discovered a planet...
Auroras get their colors from specific elements in Earth's upper atmosphere. Green auroras, for instance, come from atomic oxygen; blue is associated with molecular nitrogen. How are the colors of the aurora created? The sun radiates all visible colors, which...
Stephenson 2-18 (St2-18) is a red supergiant star located in the scutum constellation. Also known as Stephenson 2-DFK 1 and RSGC2-18. Stephenson 2-18 is currently the largest known star in the universe. This is also the most luminous red supergiants...
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