How to Learn About Galaxies and the Universe
Beyond our solar system lies the Milky Way galaxy, and beyond that, billions of other galaxies stretching across an expanding universe. Understanding galaxies, their types, and the Big Bang is the big-picture of astronomy. This deck teaches the essentials.
There are 11 cards in the deck below. You can read through them, practise them right here with the flip-card player, and then save the deck to study properly with spaced repetition — the method that makes them stick for months, not minutes.
Why galaxies and the universe is hard to memorize (and the fix)
The scales are hard to grasp (galaxy vs solar system vs universe), and the galaxy types blur. Learning the hierarchy and the three galaxy shapes fixes it.
The fix is active recall plus spaced repetition. Instead of re-reading the list (which feels productive but barely works), you test yourself — pull each answer out of memory — and you review each card on a schedule that stretches over time. Every time you successfully recall a fact, the memory gets stronger and the next review is pushed further out. That's how you go from "I saw it once" to "I just know it."
The fastest way to learn galaxies and the universe
- Break it into small batches. Learn our place first (solar system → Milky Way → universe), then the galaxy types, then the Big Bang.
- Test, don't re-read. Look at the question, say the answer out loud before flipping the card. The little struggle to recall is what builds the memory — a smooth re-read does almost nothing.
- Review on a schedule. Spaced repetition shows you each card right before you'd forget it. Get one right and it comes back in a few days, then a week, then a month. Miss one and it comes back sooner.
- Keep sessions short and daily. Five to ten minutes a day beats a two-hour cram every time. Consistency is the whole game.
One fact per card. Our galaxy, the Milky Way, is a spiral galaxy — and the whole universe has been expanding since the Big Bang.
The full deck: About Galaxies and the Universe
Here's every card in the set. Practise them above, or save the deck and let spaced repetition schedule your reviews automatically.
| Question | Answer |
|---|---|
| What is a galaxy? | A huge collection of stars, gas and dust held together by gravity |
| What galaxy is Earth in? | The Milky Way |
| What shape is the Milky Way? | A spiral galaxy |
| What are the three main types of galaxy? | Spiral, elliptical, and irregular |
| What theory describes the origin of the universe? | The Big Bang |
| Roughly how old is the universe? | About 13.8 billion years |
| Is the universe expanding or shrinking? | Expanding |
| What is the nearest large galaxy to the Milky Way? | The Andromeda Galaxy |
| What is at the centre of most galaxies? | A supermassive black hole |
| What is a light-year? | The distance light travels in one year |
| Roughly how many galaxies are in the observable universe? | Hundreds of billions |
Save this deck and actually remember it
Create a free account, keep this 11-card deck, and we'll schedule every review at the perfect moment. First deck free forever — no credit card.
Study this deck free →FAQ: learning galaxies and the universe
How long does it take to learn galaxies and the universe?
Most people can lock in galaxies and the universe within one to three weeks of short daily sessions. With spaced repetition doing 10–11 cards a day, you'll recognise them within days and recall them reliably within a couple of weeks.
What's the best way to memorize galaxies and the universe?
Active recall plus spaced repetition. Test yourself instead of re-reading, and review on a schedule that spaces the cards out over time. Flashcards are built for exactly this — which is why the deck above is the fastest path.
Is this deck free?
Yes. You can practise all 11 cards on this page for free with no account. Sign up (also free) to save the deck and let spaced repetition schedule your reviews so it sticks long-term.