| A | B |
|---|
| universe | all matter and energy that exists, in the past, now and in the future |
| 4.3 light years away | Distance from earth of nearest star |
| light year | Unit of distance that tells us how long it takes light from a star to reach the earth |
| galaxies | Collections of millions of stars |
| interstellar matter | clouds of gas and dust between stars |
| stars | Thry form from interstellar matter |
| Milky Way | Galaxy we live in |
| shape | How galaxies are classified |
| spiral | Shape of Milky Way Galaxy |
| clusters | Groups of galaxies |
| gravity | Holds galaxies together |
| big bang | Theory of Universe's origin |
| red shift | Indicates star is moving away from us |
| constellation | Stars that form a pattern in the sky |
| color | How we determine star's surface temperature |
| temperature, size and distance from the earth | What brightness of stars depends on |
| gravity | Holds stars together |
| fusion | Hydrogen atoms join to form helium. What is this called? |
| energy | When fusion occurs in stars, ______ is released |
| expanding | Red shifts in galaxies indicates that the universe is_________ |
| blue | Shorter wavelengths come from the Hotteststars which are at the ______end of the spectrum |
| stars | New ____ form from interstellar matter |
| nuclear fusion | A star is born when ______ _______ starts in the core. |
| supernovas | Suipergiant stars will probably become ___________ later in their lives, |
| white dwarfs | The earth adn other stars of medium to small size will end their lives as_________ ________ |
| Copernicus | Who first suggested that earth and other planets orbit the sun? |
| reflected,sun | Planets shine by ______light from the _____. |
| Mars,Earth,Venus,Mercury | Name the 4 inner planets. |
| Venus | Brightest object in the sky besides the sun and moon |
| Mercury | Planet with very extreme temperatures of hot and cold |
| rings | Jupiter,Saturn,Uranus and Neptune all have __________. |
| nebular model | Model of solar system formation |
| Great Red Spot | Giant storm in Jupiter's atmosphere |
| solar eclipse | When the moon blocks out the sun |
| accretion | How planets were formed |
| phases | Positions of the earth, sun and moon dtermine the ________ of the moon. |
| Telescope | Instrument used to study stars |
| asteroid belt | Separates inner from outer planets |
| stars | Shine by their own light |
| planets and moons | Do not shine by their own light |
