1) Why is Pluto no longer considered a planet?
2) What did the astronomer Carl Sagan mean by the statement, “We’re made of star stuff.”
3) Convert 1,000 light-years into meters.1) Why is Pluto no longer considered a planet?
1) Give one argument as to why the Earth’s surface has to be curved as opposed to flat.
2) A planet is observed to orbit a host star at a semi-major axis of 4 A.U. (Astronomical Units). What is the period of orbit (in Earth years) of this planet about the star?
3) Is the observed retrograde (backwards) motion of a planet in our solar system actually real or only apparent? Explain.
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