Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
History of Universe
| Term | Definition |
|---|---|
| constellation | star pattern that appears to form images |
| refracting telescope | uses double convex lenses to collect light and magnify an image |
| reflecting telescope | uses a concave mirror to collect light and a lens to magnify an image |
| radio telescope | collects and magnifies radio waves |
| light-year | distance light travels in one year---about 9.5 trillion kilometers. |
| spectroscope | device that disperses light into its component wavelengths, using a prism or diffraction grating |
| giant | late star in a star's life cycle that occurs when its hydrogen fuel is depleted, its core contracts, and its outer layers expand and cool |
| white dwarf | giant star that has lost its outer layers, leaving behind a hot, dense core that continues to contract under gravity |
| solar mass | The mass of the sun |
| photosphere | light-emitting surface of the sun |
| sunspots | cool, darker areas of the Sun's photosphere |
| galaxy | large group of stars, gas, and dust held together by gravity |
| milky way | Contains 400 billion stars including the sun |
| local group | Our Milky Way galaxy belongs to a cluster called the Local Group |
| cosmology | The study of the universe- how it began, how it evolves, and what it is made of |
| big bang theory | Theory that the universe started with a big bang, or explosion, and has been expanding ever since |
| dark matter | unseen mass that adds to the gravity of a galaxy, but cannot be detected or seen |
| dark energy | energy that might be causing accelerated expansion of the universe |
Created by:
tguay
Popular Physical Science sets