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IMSO 2023 Science International — Theory I Question 27

IMSO Science · IMSO 2023 Science International — Theory I

Question 27

Original source text (layout and all choices are preserved in the source panel below):

Figure A shows the constellation Orion while Figure B provides a graph showing the
relative luminosity and temperature of star groups and selected stars.

A B





Which of the following questions will NOT be answered by both figures A and B?
A. What is the luminosity and temperature of Betelgeuse?
B. Why can we see Orion in June but not in December?
C. Which group of stars does Aldebaran belong to?
D. Which category does a majority of stars belong to?

Question illustration

Source defect: the rightmost temperature tick is truncated in the original PDF itself (only “2,5…” is visible). The printed °C label and incomplete tick are preserved; do not infer a precise value from that tick.
  1. What is the luminosity and temperature of Betelgeuse?
  2. Why can we see Orion in June but not in December?
  3. Which group of stars does Aldebaran belong to?
  4. Which category does a majority of stars belong to?