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ME
HOLA
| HI | ME |
|---|---|
| What is the main difference between the geocentric and heliocentric models? | In the geocentric model the earth is in the center but in the heliocentric model the sun is in the center |
| Which astronomers are associated with the geocentric model? | Ptolemy and aristotle |
| Which astronomers are associated with the heliocentric model? | Copernicus, Galileo, Kepler, Newton, Hubble |
| List the four inner planets in order from the sun. | Mercury venus earth and mars |
| Explain why the inner planets are called “terrestrial planets.” | They are all small and have solid, rocky surfaces |
| List the four outer planets in order from the sun. | Jupiter saturn uranus and neptune |
| Explain why the outer planets are called “gas giants.” | These planets are larger (BUT LESS DENSE) than inner planets and composed of gas |
| What is an asteroid? | Small, rocky bodies in space that are to numerous and too small to be called planets |
| What is the asteroid belt and where is it located? | The asteroid belt is where most asteroids are found, located between the orbit of jupiter and mars |
| What is a comet? | A comet is a small body of ice, rock, and cosmic dust loosely packed together |
| What happens to a comet as it approaches the sun? | Heat from the sun melts the ice and causes the comet to “grow” a tail; this tail is blown away from the sun by solar winds |
| Define ellipse | A flattened circle; shape of a planet’s orbit around the sun. |
| use the drawing tool to draw an ellipse. | Big giant circle |
| What is the Big Bang theory? | States that the universe began when a single point of densely packed matter rapidly expanded, sending matter in all directions into space |
| What evidence do astronomers have to support this theory? | Galaxies moving apart from each other |
| About how old is the universe? | 13.7 billion years old |
| What is the name of the galaxy we live in? | The milky way galaxy |
| What type of galaxy do we live in? | Spiral galaxy |
| What keeps the planets moving in orbit around the sun? | The suns GRAVITY + the planets INERTIA |
| What would cause the moon to be pulled into Earth? | If the moon had no INERTIA |
| What would cause the moon to fly off into space? | If the moon had no gravity |
| What two factors determine how much gravitational pull one object will have on another? | (1) their masses and (2) the separation distance between them. |
| planets into the correct order from the sun. | Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune |
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