Stargazing

This task is about how the night sky changes during the night.

Question

a)  On fine nights the Southern Cross can be seen clearly.
     When viewed early in the evening it looks like this:
 
southern cross
Source:  NASA
     But when seen at around 3 or 4 a.m. the same night, it looks like this:
 
southern cross
Source:  NASA
     Why does the Southern Cross look different later in the night?

    • The stars go around in a huge circle in the night sky.

    • Stars revolve around each other in the universe.

    • Stars move with the Earth as it turns.

    • The Earth turns on its axis every 24 hours.

Question

b)  Antares is a prominent red star in the constellation Scorpio.
     Its colour indicates that, compared with the Sun which is a yellow star, it is ...

    • larger

    • smaller

    • hotter

    • cooler

    • more distant

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