Commentary by Chris Pressey

This work is distributed under a CC-BY-ND-4.0 license, with the following explicit exception: the ratings may be freely used for any purpose with no limitations.

Astronomy

Is the Moon moving away from the Earth? When was this discovered? (Intermediate) - Curious About Astronomy? Ask an Astronomer

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APOD: 2013 February 20 - Saturn's Hexagon and Rings

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How has knowledge of fusion of the Sun changed astronomy?

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Do all galaxies have a blackhole in the center

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What keeps galaxies together?

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