Earth, sun, moon: three objects in space whose interactions have a pretty big impact on our lives. Earth orbits the sun once a year, and it rotates on its axis about once a day (depending on your ...
This image from NASA schematically illustrates the elliptical nature of our orbit about the sun (and the moon's orbit around the Earth), showing the points of aphelion and perihelion. Note that the ...
The far side of the moon and distant Earth, imaged by the 2014 Chang’e-5 T1 mission service module. Credit: Chinese Academy of Sciences HELSINKI — Two Chinese spacecraft appear to have successfully ...
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