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T6.2TheUniverse
6.2 Learning About the Universe
| Term | Definition |
|---|---|
| Electromagnetic radiation | energy transferred through space by electromagnetic waves |
| visible light | electromagnetic radiation that can be seen with the unaided eye |
| reflection | the bouncing back of an object or a wave when it hits a surface through which it cannot pass |
| refraction | the bending of waves as they enter a new medium at an angle, caused by a change in speed |
| spectrum | the range of wavelengths of electromagnetic waves |
| telescope | an optical instrument that forms enlarged images of distant objects |
| wavelength | the distance between two corresponding parts of a wave such as the distance between two crests |
| X-Rays | electromagnetic waves with wavelengths shorter than ultraviolet rays but longer than gamma rays |
| space probe | a spacecraft that carries scientific instruments to collect and transmit data, but has no human crew |
| reflecting telescope | an optical telescope that uses mirrors to collect light |
| refracting telescope | an optical telescope that uses multiple lenses to collect light |
| radio telescope | non-optical telescope that detects radio waves from objects in space |
| orbiter | a space probe equipped to photograph and analyze the atmosphere of a planet |
| lander | a space probe equipped to land on a planet and analyze the materials on its surface |
| Sputnik | 1957 - first artificial satellite to orbit Earth |
| 1st Moon Landing | 1969 - Apollo 11 |
| Hubble Space Telescope | 1990 - First space located observatory |
| Mars Rovers | 2003 - Two vehicles landing on and exploring Mars |
| Space Shuttle | 1981 - First reusable spacecraft; can take off like a rocket and land like a plane |