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Persh Astro 3 and 4

Persh Astro 3 and 4

What does the Torino scale? the sytem used to rate the hazard level of an object moving towards Earth.
Why do they study smaller objects in our solar system like comets and asteroids? They have not changed since the solar system was formed
What layer lies just below the crust? Mantle
How are inner planets and outer planets different? they are closer together
What is the effect of distance a planet is from the sun? The closet a planet is to the sun, the faster it travels around the sun.
What is the sun powered by? nuclear fusion
What happens during nuclear fusion in the sun? Hydrogen nuclei combine to form helium
What is unusual about Pluto's moon? It's more than half of Pluto's size
How do planets move if they are closer to the sun? faster
The Earth's revolution is about how long? 365 days
Which scientist made discoveries about motion of planets? Johannes Kepler
Which group of planets does Earth belong to? the inner planets
Which planets do not have natural satellites (moons)? Mercury and Venus
What tool made finding planets easier? the telescope
What bodies in the solar system collided to form Earth and other planets? planetesimals
What is Venus sometimes called Earth's twin? Venus and Earth are similar in size and density
Name one factor that makes life possible on Earth? liquid water on surface
How do scientists think oceans formed? Millions of years of rainfall
What is the largest planet in our solar system? Jupiter
What causes the moon phases? the positions of the moon, Earth and sun
What does a planet with a large orbit have? long period of revolution
What layer of the Earth is the center-most layer? Core
Why do active planets show fewer impact sites than our moon? Geological activity removes their effects
What is the current theory about the origin of our moon? a large body impacted Earth and blasted some of its mantle into space to form the moon
How are gas giants different from terrestrial planets? they are made mostly of gas
What number planet is Saturn and Venus? Saturn is 6 Venus is 2
Between which two planets is the asteroid belt located? 4 & 5
What is a nebula? a large cloud of gas and dust
What gas is added to the atmosphere during photosynthesis? oxygen
What is a sunspot? a cooler area of the photoshere that may affect the climate
When you plant a garden, where do we get the soil from? crust
Our solar system was formed from this... a cloud of dust called the Solar Nebula.
What layer of the sun do we see? photosphere
What kind of rotation does Venus have....which means it appears to go clockwise direction? retrograde
What are satellites? natural or artificial bodies that orbit larger bodies
What do some scientists call the dirty snowball? comets
What do we call a counterclockwise spin of a planet? prograde
In relation to the moon phases...what do waxing and waning mean? waxing - the lit size is getting larger waning - the lit size is getting smaller
Know how to label the phases of the moon.
Created by: ellist