GCSE Physics practice questions on stars, galaxies and the universe. Try 3 for free below — with hints, the answer and why the wrong answers are tempting. GCSE Beast has 24 questions on this topic, from first steps to the hardest exam-style problems.
A student is making a fact sheet called 'Our place in space'.
Which row is correct?
| main elements in the Sun | number of stars in the Milky Way | |
|---|---|---|
| A | hydrogen and helium | a few thousand |
| B | hydrogen and helium | many billions |
| C | oxygen and carbon | a few thousand |
| D | oxygen and carbon | many billions |
Members of a school astronomy club in the Gobi desert look at the bright star Vega. Vega is 25 light-years from the Earth. They make three statements.
1 The light from Vega that reaches us tonight left the star about 25 years ago. 2 We see Vega as it is tonight, because light travels so fast. 3 Vega is in the same galaxy as the Sun.
Which statements are correct?
A class uses data from a space telescope to plot the speed at which galaxies move away from the Earth against their distance. The graph shows their results and the best-fit line.
What value of the Hubble constant do their results give?
