Comment by creidhne on How did scientists decide the boundary of the Milky...
@Qiulang I understood your interest in astronomy at the time of Hubble's use of Cepheid stars as the first step in determination of scale of the universe. The Shapley-Curtis Debate demonstrated the...
View ArticleAnswer by creidhne for How was this image of the faculae in the Occator...
The Dawn space probe entered orbit around dwarf planet Ceres on March 2015 and continued until 1 November 2018 when its fuel had been depleted. During the Ceres portion of the mission, the spacecraft...
View ArticleComment by creidhne on Are the NASA Dial-A-Moon frames rendered as seen from...
The NASA web site says, "The animation ... shows the geocentric phase, libration, position angle of the axis, and apparent diameter of the Moon ..." The "geocentric" term means the view displays the...
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