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Retrograde motion is an effect of changing perspective. Inferior planets Mercury and Venus show retrograde motion on either side of inferior conjunction. They "overtake" Earth as they pass between Earth and the Sun.
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Space is Deep
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Supermassive black hole winds blowing at 36 million mph can sculpt entire galaxies
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Space is Deep
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First discovered in 1826, the Bug Nebula is one of the brightest planetary nebulae. The central star is thought to have an extremely high temperature, and its intense heat lights up the surrounding stellar material.
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Space is Deep
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Some scientists speculate that the universe is shaped like a doughnut, instead of stretching to infinity. It’s a topology that could eventually be mapped.
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Space is Deep
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RCW 49 is one of the most productive regions of star formation to have been found in the Milky Way. It spans a distance of about 350 light-years, and it is thought that over 2200 stars reside within it.
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New discoveries from the far reaches of space
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Space is Deep
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Camelopardalis is a dim constellation of the far northern sky, representing a giraffe. The giraffe's long neck can be visualized as stretching around the north celestial pole toward Ursa Minor and Draco.
