... 50 Greatest Mysteries . ... Star Atlas . ... Supernova showered Earth with radioactive debris . ... stars . ... Cosmic Adventures . ... Closest type Ia supernova in decades solves a cosmic mystery . ... Confirming a carbon-oxygen white dwarf . ... The spectra gave us the carbon and oxygen, so we knew we had the first direct evidence that a type Ia supernova does indeed start with a carbon-oxygen white dwarf." ... Only registered members of Astronomy.com are allowed to comment on this article. ...
... A Portable Human-Powered Orrery The scale of our model is 1 m = 1 AU. ... Relative positions of the planets in the night sky Having the person representing the Earth and the other planets discuss their positions in the sky and when they can be seen (only at night) Predicting the night sky Looking at the locations of the planets relative to the constellations to predict what they will see when they go out after sunset to observe the real sky Revolution of the ...
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