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stars and planets

Practice for a sience test on space GRADE 5

How many planets are there? 8
How many days is one revolution for Earth? 365 1/4 days
How many hours is one rotation? 24 hours
What is an orbit? a path
What is a moon? Any smaller object that revolves around a planet
Earth's moon's surface has what 3 main things? no liquid water,no living things,more craters than Earth
What is a crater? A bowl shaped area on the surface of a planet or moon
What is an eclipse? when one body in space blocks light from reaching another body in space
What is a lunar eclipse? Full moon passes through the shadow of Earth
What is a solar eclipse? New moon casts a shadow on Earth
Name the colors of the stars from the hottest color to coolest color. Blue,White,Yellow,Red
What is the nearest star to our solar system? our sun
About how many stars are in the Milky Way Galaxy? 200-500 billion stars
Which arm are we in? Orion arm
What is a galaxy made of? Billions of stars,planets,gas and dusts
What are astronomers? People who study space
The sun holds what percentage of mass for our solar system? 99%
What two gasses are stars made up of? Hydrogen and helium (constantly reacting,make nuclear fusion and give off light energy and heat energy)
What does our sun do other than giving off light energy and heat energy? Sun's gravity holds all our planets in orbit
What does are solar system contain? Planets,moons,sun,meteoroids,comets,asteroids
What are asteroids? Rocky objects(minor planets)big pieces
What are meteoroids? Rocky or small objects (in space)
What are meteors? Meteoroids that went into the Earth's atmosphere but has no reached Earth's surface(have long burning tails)
What are meteorites? Meteoroids that have reached Earth's surface.
What are comets? Tails of gas and dust (contains:rock,ice,gas)orbit close to the sun or far out past neptune
Where is the astroid belt? Between Mars and Jupiter
What is 1 AU? Distance from sun to earth
What is the biggest planet? Jupiter
What is the smallest planet? Mercury
Which kind of planets are denser? INNER PLANETS
Which 2 planets do not have moons? Mercury and Venus
Which kind of planets have more moons? Outer planets
Which planet is more dense? Earth
When is the test? NEXT WEDNESDAY
Is orbit a noun or a verb? noun
Created by: swetha4