Unit 10
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Created by:
lategan456 on January 5, 2012
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Terms | Definitions |
|---|---|
 The distance that light can travel in one year is called a ____________________. | light year |
| What process creates energy the core of stars? | nuclear fusion |
| Stars are born from clouds of dust and gas called __________________. | nebulae |
| What conditions are necessary for nuclear fusion to occur? | extreme heat and pressure |
| In a star's main sequence the element _____________ is being fused into the element _____________. | hydrogen, helium |
| A star enters its red giant stage when it begins fusing which element? | helium |
| What do small stars become after their red giant stage? | white dwarf |
| What is the heaviest element that red supergiants can create by nuclear fusion? | iron |
| How are elements heavier than iron created? | supernovas |
| What object will be created by the supernova when the leftover core is more than 5 times the mass of the Sun? | black hole |
| What object will be created by the supernova when the leftover core is less than about 5 times the mass of the Sun? | neutron star |
| What is the name of the galaxy we live in? | Milky Way |
| One explanation for the accelerating expansion for the universe is an undiscovered form of energy called ________________________. | dark energy |
| Mysterious matter that doesn't emit light is called ______________________. | dark matter |
| What is the most widely accepted explanation for how the universe formed? | Big Bang theory |
| Approximately how old is the universe? | 13.7 billion years |
| Which law states that the farther away a galaxy is, the faster it is moving away | Hubble's Law |
| What does redshift tell scientists about the universe? | the universe is expanding |
| A light source that is rapidly moving away from an observer will exhibit ____________. | redshift |
| What shape is the Milky Way galaxy? | spiral |
| Which theory explains that all matter in the universe expanded from a single point? | The Big Bang Theory |
| The larger a star is, the ____________ its main sequence will be. | shorter |
| The coolest stars burn ________, while the hottest stars burn ________. | red; (yellow, white); blue |
| From birth to death, our sun is expected to spend a total of __________________ years in its main sequence, before running out of Hydrogen fuel | 10 billion years |
| Which is larger: a solar system or a galaxy? | a galaxy |
| What happens to the pitch of a car horn as it approaches a listener? | the pitch goes up (increases in frequency) |
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