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| a hypothesis, supported by data, that describes how the universe began with a huge explosion |
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| a vast group of billions of stars that are held together by gravity |
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| a simple machine with a sloping surface |
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| a simple machine made up of a bar that pivots around a fixed point |
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| the transfer of heat energy by direct contact between particles |
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| a self-sustaining natural system of living things and their environment |
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| a simple machine made up of a wheel around which a rope or chain is passed |
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| the Sun and the planets and other objects that orbit the Sun |
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| a unit used to measure force |
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| the fixed point around which a lever pivots |
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| a force that resists, or opposes, motion |
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| a unit of measurement representing the distance that light travels in one year |
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| a natural object that revolves around a planet |
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| the energy that an object has because of its position or structure |
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| a simple machine made of two wheels of different sizes that pivot around the same point |
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| a device that makes work easier by reducing the amount of force needed to do a job |
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| an extremely dense, invisible object in space whose gravity is so great that not even light can escape it |
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| the remains of a massive star that has exploded in a supernova |
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| the transfer of energy by waves |
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| Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto |
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| List the planets in order starting from the closest to the sun. |
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| You take in ________ when you breathe in, and you let out __________ when you breathe out |
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| _____ has spectacular rings that are its most distinctive feature |
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| _________ was discovered as the Roman goddess of beauty |
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| Can you swallow in space without the help of a life support system? |
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| _________ is the largest of the four inner planets. |
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| _________ resembles Earth more than any other planet. |
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| Search for Extraterrestrial Intelligence |
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| What does SETI stand for? |
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| opposing and resisting forces |
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| What kind of forces are gravity and friction? |
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| __________ is blue-green in color and very cold |
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| __________ atmosphere is about 78% nitrogen and 21% oxygen |
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| What is the name of the probe carrying a sound disk? |
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| __________ is the fifth planet from the sun and the largest in our solar system. |
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| Mercury, Venus, Earth, Mars |
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| Jupiter, Saturn, Uranus, Neptune, Pluto |
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| What does it mean when someone describes another person as energetic? |
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| That person is in constant motion or doing a lot or work. |
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| Energy changes form, but is never destroyed. |
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| What kinds of things can sound energy damage? |
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| it can shatter glass and damage eardrums |
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| How is the energy in food measured? |
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| Describe how people get energy for their bodies and the path it takes? |
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| Energy starts from the Sun, to plants, to the food people eat. |
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| _____ is the only form of energy that can travel through empty space. |
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| Other forms of energy needs a ____ of some kind to carry, or transfer, it. |
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| What happens to energy after you use it? |
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| energy is never destroyed, it simply changes form |
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| How is calories counted in food? |
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| food is burned in a calorimeter to find out how many calories the food contains |
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| In what ways do increasing human populations affect the problem of world hunger? |
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| In some places there are more people than food to feed them. |
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| What is the formula for work? |
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| ____ is needed to do work. |
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| Gravity and friction are ____ forces. |
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| A unit for measuring force is named in honor of ____. |
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