Question
The nearest star to the Sun is about four light-years away from the Earth.
A student makes three statements about the star.
- Light from the star takes about four years to reach the Earth.
- Light from the Sun takes about four years to travel to the star and back to the Earth.
- The star is outside our galaxy.
Which statements are correct?
A 1,2 and 3
B 1 and 3 only
C 1 only
D 2 and 3 only
▶️Answer/Explanation
Ans:C
Question
The table lists some information about some stars.
Which star will eventually explode as a supernova?
▶️Answer/Explanation
Ans:B
Question
The diagram shows a star \(S\) and the initial arrangement of three planets, \(X, Y\) and \(Z\).
Each planet orbits clockwise in a circle about \(\mathrm{S}\).
The time for one orbit of \(Y\) is three times the time taken for one orbit of \(X\).
The time for one orbit of \(Z\) is twice the time taken for one orbit of \(Y\).
Starting from the initial arrangement, which diagram shows the positions of the planets after \(X\) has made one complete orbit?
▶️Answer/Explanation
Ans:B