IQ The most obvious systematic motions in the sky are the daily, or diurnal, changes caused by the Earth’s rotation. T F.
IQ The sun is made of hydrogen (~74%) and helium (~25%), making it similar in composition to the theoretical mix of the universe at the time of the Big.
IQ Most changes in the appearance of the sky are caused by the Earth’s revolution. T F.
IQ The original atmospheres of Mars and Earth were very similar. T F.
