Topic 15 – Our place in the Galaxy 15.1 - Understand the appearance of the Milky Way from Earth as seen with binoculars or a small telescope

15.2 - Know the size and shape of our Galaxy and the location of the Sun, dust, sites of star formation and globular clusters

15.3 - Understand how 21 cm radio waves, rather than visible light, are used to determine the structure and rotation of our Galaxy

15.4 - Know that the group of galaxies gravitationally linked to the Milky Way is called the Local Group

15.5 - Know the composition and scale of the Local Group, including its principal components:
a) Andromeda Galaxy (M31)
b) Large and Small Magellanic Clouds (LMC and SMC)
c) Triangulum Galaxy (M33)

15.6 - Be able to classify galaxies using the Hubble classification system, including:
a) spiral
b) barred spiral
c) elliptical
d) irregular

15.7 - Know how the different types of galaxies were placed by Hubble on his ‘Tuning Fork’ diagram

15.8 - Know that the Milky Way is a barred spiral (SBb) type galaxy

15.9 - Know that some galaxies emit large quantities of radiation in addition to visible light

15.10 - Know that an Active Galactic Nucleus (AGN) is powered by matter falling onto a super-massive black hole

15.11 - Know types of active galaxies, including:
a) Seyfert galaxies
b) quasars
c) blazars

15.12 - Know that information about AGNs can be obtained from many regions of the electromagnetic spectrum

15.13 - Understand why galaxies are grouped in larger clusters and superclusters

15.14 - Understand the main theories for the formation and evolution of galaxies
Topic 6 – Celestial observation 6.21 - Understand the appearance of the Milky Way from Earth as seen with the naked eye


In this section you will learn about different types of galaxies.

At the end of this section take the mini quiz to test yourself.