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Astronomy Essentials
Explore the universe: planets, stars, and celestial phenomena
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Clone this Deck & Start StudyingFlashcards (6)
Card 1
What are the 8 planets in our solar system (in order)?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune (Mnemonic: My Very Educated Mother Just Served Us Nachos)
Card 2
What is a light-year?
The distance light travels in one year, about 9.46 trillion kilometers. Used to measure vast distances in space.
Card 3
What is the difference between a star and a planet?
Stars produce their own light through nuclear fusion. Planets reflect light from stars and orbit them.
Card 4
What is a black hole?
A region of spacetime where gravity is so strong that nothing, not even light, can escape. Formed from collapsed massive stars.
Card 5
What causes the phases of the Moon?
The Moon's position relative to Earth and the Sun changes, causing different portions of the illuminated side to be visible from Earth.
Card 6
What is the Big Bang Theory?