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41 Cards in this Set
- Front
- Back
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Orbit
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The path of a planet as it goes around the sun.
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Increases
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If the masses of the object increases, the force of gravity _______.
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Decreases
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If the distance between the objects increase, the force of gravity _______.
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Heliocentric
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In a ________ system, earth revolves around the sun.
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Ellipse
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The oval shape path that a planet takes when it revolves around the sun.
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Sun planets moons asteroids meteoroids
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Our solar system consists of the ______, the ________ and their ______, comets, _________, and _______.
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Sun
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About 99% of the mass of our solar system comes from the _______.
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Nuclear Fusion
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Sun produces energy by ______.
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Sunspots
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Darker areas on the surface of the sun that are cooler than the surrounding areas.
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Mars Venus Earth Mercury
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Four terrestrial (inner) planets
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Small dense and rocky surfaces
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Three things that the terrestrial planets have in common.
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Mercury
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The smallest terrestrial planet
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Earth
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Largest terrestrial planet
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Day
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One rotation of the planet's axis
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Year
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One revolution of a planet around the sun.
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24
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One Earth day is about _____ hours
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365 1/4
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One Earth year is ______ days.
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Seasons
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The tilt of the axis of both Earth and Mars causes _______ to occur on these planets.
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Density and size
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Venus and Earth are alike in terms of ______ and _______
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Venus and Mars
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Inner planets that have atmospheres made up mainly of carbon dioxide.
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Mercury
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The inner planet that has no atmosphere.
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Earth
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The inner planet that has an atmosphere that is 78% nitrogen and 21% oxygen.
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Venus
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The inner planet that rotates form east to west while the rest of the inner planets rotate from west to east.
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Neptune Uranus Jupiter Saturn
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Four gas planets
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Hydrogen hrlium
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The gas giants are made up mainly of ______ and _____.
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Jupiter
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Largest of these gas giants is ______\.
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Rings
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Gas giants all have these.
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Rock and icr
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The rings are made up of _____ and _____ that orbit around these planets.
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Uranus
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The planet that totes from top to bottom.
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Pluto
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Is no longer considered to be a planet, now classified as a dwarf planet.
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Comets
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Are loose collections of ice, dust and small rocky particles that orbit around the sun in ling, narrow ellipses.
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Nucleus coma tail
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Three parts of a comet
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Tail
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A comets _____ can be over 100 million kilometers long.
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Kuipter Oort
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The two regions in our solar system where comets come from are the _____ belt and the _______ cloud.
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Asteroid
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Rocky objects orbiting the sun that are found between the orbits of Mars and Jupiter.
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Meteroid
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Is a chunk of rock I space, it comes from comets or asteroids.
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Meteor
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Is a chunk of rock from space which is now in the Earth's atmosphere that creates a streak of light.
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Meteorite
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Is a chunk of rock from space which is now on the surface of the Earth.
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Moon
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A natural satellite that revolves around a planet.
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Sun planets moon asteroid meteoroid
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List the object in our stars solar system from largest to smallest: asteroid, meteoroid planet moon and the sun.
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List the planets in order starting with closest to the sun.
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Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
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