| Date | May 2018 | Marks available | 1 | Reference code | 18M.3.SL.TZ1.10 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Distinguish | Question number | 10 | Adapted from | N/A |
Question
Distinguish between the solar system and a galaxy.
[1]
a.i.
Distinguish between a planet and a comet.
[1]
a.ii.
Markscheme
a galaxy is much larger in size than a solar system
a galaxy contains more than one star system / solar system
a galaxy is more luminous
Any other valid statement.
[1 mark]
a.i.
a comet is a small icy body whereas a planet is mostly made of rock or gas
a comet is often accompanied by a tail/coma whereas a planet is not
comets (generally) have larger orbits than planets
a planet must have cleared other objects out of the way in its orbital neighbourhood
[1 mark]
a.ii.
Examiners report
[N/A]
a.i.
[N/A]
a.ii.
