Inside the Earth it is very hot. This heat ultimately comes from

Star A and star B appear to be the same brightness, even though star A is four times farther away than star B. How many times more luminous is star A than star B?

Which of the following apparent magnitudes is the brightest?

The image below shows a light curve from a variable star. Use the graph to answer the following questions. The x-axis is the time in days. What is the period of this star’s pulsation?  Based on the period, confirm (or not) that this is a Cepheid variable?           Where would you find this variable star on an HR diagram? iv) When will the next maximum occur? 

Short Answer Questions Answer the following five short-answer questions in complete sentences.

Short Answer Questions Choose four of the following questions and answer them in complete sentences.

Which of the following statements is true about plate tectonics?

Would a planet orbiting the Sun be travelling faster at perihelion or aphelion? Justify your answer with Kepler’s Second Law of Planetary Motion.

The reason that there are not solar and lunar eclipses approximately every month is because

If you wait the length of time for the Earth to rotate exactly once on its axis (one sidereal day), which astronomical object would be in the same apparent place in the sky?