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Astronomy
Quiz 1
| Question | Answer |
|---|---|
| K | Kilo, x1000 |
| M | Mega, x1,000,000 |
| G | Giga, x1,000,000,000 |
| T | Tera, x1,000,000,000,000 |
| m | Mili, 1/1,000 |
| u | micro, 1/1,000,000 |
| n | Nano, 1/1,000,000,000 |
| p | Pico |
| f | femto |
| Length is measured in | Meters and Kilometers |
| AU | Astronomical Unit |
| LY | Light Year |
| Time | seconds |
| Tycho Brahe | Believed in geocentric universe and made very meticulous atronomical observations |
| Johanes Kepler | Looked for patterns behind motions of heavenly bodies and formulated three laws of planetary motion. Created a heliocentric model of universe |
| Galileo Galilei | Observed phases of Venus and Moons of Jupiter. FOunded Kinematics, the first fully mathematical description of motion |
| Sir Isaac Newton | Wrote his three laws of motion which form the basis of physics. Law of Universal Gravitation. Co-inventor of calculus |
| Speed of light | 300 million m/s |
| 1 parsec = | 4.2 ly |
| early universe | 76% hydrogen, the rest helium |
| Cartesian Coordinates | 3 directions at right angles |
| Polar Coordinates | 2 directions, one distance |
| Zenith | straight over head |
| Nadir | opposite side of sphere |
| Ecliptic | the path the sun takes |
| vernal= | spring |
| autumnal= | fall |
| any planet that has a tilted axis | will see different hemispheres get different amounts of sunlight depending on the time of the year |
| penumbra | is the region where partial eclipses are seen |
| waxing | growing larger |
| waning | growing smaller |
| solar eclipses | only occur during new moons |
| lunar eclipses | only occur during full moons |
| x/t= | velocity |
| v/t= | acceleration |
| newtons first law | an object will not change its velocity unless acted upon by an outside force |
| newtons second law | an objects acceleration is proportional to the force on it, and inversely proportional to its own mass |
| newtons third law | whenever an object exerts a force, it is subject to an equal and opposite force |
| KE+PE= | mechanical energy |
| energy can change forms, but | can't be destroyed or created from nothing |
| parabolic orbit | is the lowest energy orbit that escapes to infinite distance |
| circular orbit at higher distances | give smaller speed |
| white light= | mixture of all wavelengths |
| distance between peaks is | wavelength |
| frequency is | number of peaks passing a point in one second |
Created by:
crescenti
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