Galaxies: types, structure, and scale

What this quiz covers

From spiral arms to giant ellipticals, these questions focus on how galaxies look, how they’re organized, and how astronomers compare their sizes and distances.

You’ll also touch on the bigger picture: groups, clusters, and the cosmic web, plus the key terms used to describe structure and scale.

Format, difficulty, and question count

Each question has 4 options and there’s no timer, so you can reason through concepts like morphology, components, and observational clues at your own pace.

Set the question count before you start, and choose a difficulty level that fits your goal; the mixed setting balances straightforward definitions with more applied, comparison-style items.

Skills you’ll practice

• Identifying galaxy types (spiral, barred spiral, elliptical, irregular) from defining traits
• Linking structures (bulge, disk, halo, arms) to what they imply about stars and gas
• Comparing scales: galaxy sizes, distances, and how clusters/superclusters fit together
• Using common astronomy vocabulary correctly (e.g., morphology, cluster, group)
• Interpreting basic observational cues without overcomplicating the physics

Common pitfalls to avoid

Many misses come from mixing up “shape” labels with “size” or “age” assumptions—elliptical doesn’t automatically mean “small” or “young,” for example.

Another trap is confusing local structures (like the Milky Way’s components) with large-scale structures (like galaxy clusters); watch the context clues in the question.