| A | B |
|---|
| The Big Bang took place | 13.7 billion years ago |
| Hubble proposed tha the universe | is expanding in all directions |
| Hubble's proposition was based on | red shift analysis |
| George Lamaitre first proposed the theory | that the universe formed in a single dramatic moment of expansion |
| COBE | Cosmic Background Explorer |
| WMAP | Wilkinson Microwave Anistropy Probe |
| A galaxy is a collection of stars, gas and dust | held together by gravity |
| Andromeda is our nearest | neighbouring galaxy |
| Galactic cannibalism | a larger galaxy pulling apart a smaller one |
| Astrobiologists study the possibiity | that extraterrestrial life exists |
| SETI | Search for Extrarrestrial Intelligence |
| Eagle Nebula is 7,000 | light years from Earth |
| How long a star lives depends | on its mass |
| The Sun will expand to a red giant | in about 5 billion years |
| A high mass star consumes | fuel faster than smaller stars do |
| Asteroids are | small rocky bodies in our solar system |
| An astronomical unit is roughly | equal to the distance between the Sun and the Earth |
| Constellations are | distinctive patterns in the night sky |
| Nicolas Copernicus | 1473 - 1543 |
| Copernicus proposed the | heliocentric model of the solar system |
| Cosmological red shift is caused | by the expanding universe |
| Doppler Effect is the change | in wavelengths because of movement of the source relative to an observer |
| An Elliptical Galaxy contains | some of the oldest stars in the universe |
| Galileo | 1564 - 1642 |
| Geosynchronous orbit | is a satellite that remains stationary above a fixed point |
| Interstellar matter is made up | hydrogen and dust |
| An irregular galaxy is made up | of a mix of newly forming stars and old stars |
| Johannes Kepler | 1571 - 1630 |
| One light year equals | 9.5 trillion kilometres. |
| Meteorites are | large enough not to burn up |
| Nebula | a cloud of gas and dust in space |
| Ptolemy | 90 - 168 AD |
| Solar Eclipse occurs when the | Moon is between the Sun and the Earth |
| Solar flares are extremely violent | eruptions of gas from the Sun's surface |
| Solar wind are high-energy | particles ejected by the Sun |
| Sunspots | dark patches on the Sun's surface that are slightly cooler |
| Supernova | a high mass star collapses on itself |
