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Website title: Little Astronomy - Astronomy and Space for Everyone

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The nearby sky contains a surprising variety of low-temperature objects—red and brown dwarfs, T and Y spectral types, and other faint neighbors discovered by wide-field infrared surveys. These cool objects help astronomers study atmospheres, formation processes, and the immediate solar neighborhood in ways hotter stars cannot. There are 25 Coolest Stars, ranging fro...

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When Albert Einstein published his 1905 paper on special relativity he showed something startling yet testable: moving clocks run slow. That simple result helped turn time from an immutable backdrop into a physical quantity that depends on motion and gravity. A few decades later general relativity (1915) completed the picture by making spacetime itself dynamical, and the cons...

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Gravitational-wave astronomy has mapped dozens of collisions between black holes, giving us a running record of when and how these extreme events occur across the sky. The list below collects those detections into a single, searchable table for quick comparison. There are 59 Merging Black Holes, ranging from GW150914 to GW200316_215756. For each entry you’ll find be...

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Recall the August 21, 2017 total solar eclipse that swept across the continental United States — millions paused to watch day briefly turn into night. That single, unforgettable path of totality captured the public imagination and drove tourism to small towns, while scientists used the brief darkness to study the Sun’s corona and test instruments. Solar ec...

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From backyard stargazers to professional observatories, tracking recurring visitors helps both planning and curiosity. A compact, sortable list makes it simple to see which comets return on human timescales and when they might be visible again. There are 99 Periodic Comets, ranging from Arend to van Biesbroeck. The table is organized with Designation,Period (yr),Next periheli...

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