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Free Astronomy Flashcards
Astronomy blends unforgettable ideas with very forgettable numbers — distances, orders, and classifications that flashcards keep fresh. These starter cards cover the solar system and stellar basics.
Study these 10 starter cards
QUESTION
Tap the card to reveal the answer
QWhat is the order of planets from the Sun?
AMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
QWhat is the largest planet in the solar system?
AJupiter
QWhat is a light-year?
AThe distance light travels in one year (~9.46 trillion km)
QWhat force keeps planets in orbit around the Sun?
AGravity
QWhat is the Sun mostly made of?
AHydrogen (with helium second)
QWhat galaxy do we live in?
AThe Milky Way
QWhat is a supernova?
AThe explosive death of a massive star
QWhich planet is known as the Red Planet?
AMars
QWhat defines a black hole?
AGravity so strong that not even light can escape its event horizon
QRoughly how long does sunlight take to reach Earth?
AAbout 8 minutes
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Reading answers is recognition — remembering them next month takes spaced repetition. Build your own astronomy deck and we'll schedule every review at the right moment.
Create your free deck →How to study astronomy with flashcards
- One fact per card. Turn sequences (planet order, stellar life stages) into "what comes after X?" cards rather than one giant list card.
- Rate honestly. After each card, choose Again, Hard, Good, or Easy — the spaced repetition algorithm uses your answer to decide when the card returns, right before you'd forget it.
- A few minutes daily beats marathons. Ten new cards a day is roughly 3,650 a year, retained. Deep dives: How to make flashcards that actually work · How to study for exams with flashcards.
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