| A | B |
|---|
| The sun consists of largely of hydrogen has its energy comes from? | Nuclear fusion of hydrogen to helium |
| Stars form by? | Condensation of interstellar gas |
| Meaning of apparent magnitude? | The apparent brightness of a star |
| Meaning of absolute magnitude? | The actual brightness at a specific distance |
| The four inner(terrestrial) planets consist mostly of ? | Solid rock |
| Moon phases are the result of ? | The moon revolving around the earth |
| Comets orbit the sun and consist mostly of ? | Frozen gases |
| Tail always points away from the sun due to ? | Solar winds |
| Asteroid belt is located between ? | Mars and Jupiter |
| What are meteoroids that do not completely burn up in the atmosphere and hit the earth? | Meteorites |
| Galaxies are ? | Collections of large numbers of (billions) of stars |
| Our solar system is part of what galaxy? | Milky Way galaxy |
| 3 types of galaxy's ? | Spiral,elliptical,irregular |
| Big Bang theory | Universe began 15 billion years ago as a dense sphere that expanded eventually condensing into planets |
| Solar nebula theory | Planets formed through condensation of a solar nubular |
| Heliocentric model | All of the planets revolve around the sun |
| Geocentric model | All of the planets revolve around the earth |
| Light year | Distance light travels in one year |
| Astronomical unit | The distance between the earth and the sun |
| Parallax | The apparent shift in motion |
