Nebulae and external galaxies
Answers are for parents and teachers.
1
If dust dims light by 1 magnitude per kpc, by how many magnitudes at 5 kpc?
5
2
How many years from 1054 to 2026? (2026 – 1054)
972
3
The Large Magellanic Cloud is ≈ 160,000 light-years away. In how many years does its light reach us?
160000
4
Write the difference between a spiral and an elliptical galaxy in two sentences.
A spiral has arms, a disc, gas and young stars. An elliptical has no arms, its stars are old and it has little gas.
5
Why is observing a distant galaxy called a “time machine”?
Its light has travelled a long time, so we see it as it was in the past.