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Astronomy- planets
Marano- Astronomy- Planets
Question | Answer |
---|---|
solar system | made of sun, planets and other bodies that travel around it |
Nebula | very large clump of gas (hydrogen and helium) |
Two forces that keep the nebula in balance | gravity and pressure |
Planetesimals | the tiny building blocks of celestial objects formed when the bits of dust stick together within the nebula |
Examples of planetesmials | planets, comets, stars, meteors |
Used to measure the distance between planets | astronomical units (AU) |
1 AU | average distance between the Earth and the Sun |
Describe the inner planets | terrestrial planets- smaller, denser, rockier, hotter and more closely spaced |
name inner planets | Mercury, Venus, Earth and Mars |
Describe the outer planets | gaseous- larger, cooler, nonsolid and have rings except for Pluto |
Name the outer planets | Jupiter, Saturn, Uranus, Neptune and Pluto |
Mercury | the planet that has the greatest temperature range and is the second smallest |
Venus | Called morning or evening star and is the hottest planet due to the greenhouse effect |
Venus | Retrograde rotation |
Retrograde rotation | rotates backwards and clockwise |
Prograde rotation | normal and counterclockwise |
Earth | Planet that is 3/4 water and has life |
Mars | red planet with thin atmosphere, polar ice caps and 2 volcanic systems |
Jupiter | largest planet that has a Great Red Spot and 28 moons |
Saturn | Second largest planet with a complex ring system and moon called Titan |
Neptune | Planet that crosses in and out of Pluto's orbit, blue world and great dark spot |
Pluto | smallest planet with retrograde rotation, ice, with moon called Charon |