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Astronomy Part One
This review will help you study for Astronomy Test #1
| Term | Definition |
|---|---|
| Universe | All things in existence |
| Celestial Object | Any object outside or above Earth |
| What is the age of the Universe? | 10-20 Billion Years |
| Most widely accepted theory | Big Bang Theory |
| What are the 2 pieces of evidence that supports the Big Bang Theory? | Background Radiation and the Red shift |
| What is the longest form of Electromagnetic Energy found on the Reference Tables chart? | Microwaves |
| What is the shortest form of Electromagnetic Energy found on the Reference Tables chart? | Ultraviolet |
| What color has the longest wavelength? | Red |
| What color has the shortest wavelength? | Violet |
| What is the Doppler Effect? | The apparent shifting of visible light caused by the relative motion of the energy source and the observer. |
| What is it called when a Celestial object is moving AWAY from the Earth? | Red Shift |
| What is it called when a Celestial object is coming TOWARDS the Earth? | Blue Shift |
| Galaxy | A collection of Billions of stars held together by gravity |
| What are the 3 shapes galaxies are grouped into? | Spiral, Elliptical, Irregular |
| What is the name of the galaxy that our solar system is part of? | Milky Way |
| What is a light year? | The distance light travels in one year |
| How many miles can light travel in one year? | About 6 trillion miles |
| What is a star? | A large ball of gas and dust held together by gravity |
| What makes a star and a planet different? | Stars can produce their own light |
| Nuclear Fusion | Combining of hydrogen to produce helium |
| Circumpolar Star | Stars that appear to make circles around Polaris |
| Diurnal stars | Stars that appear to rise and set |
| Luminosity | Measurement of how bright a star is compared to the Sun |
| Black Dwarf | Dead star |
| What determines the path a star will take during its existence? | The original mass and size |
| Solar System | The Sun and all the objects that orbit the Sun |
| Satellite | Any object that revolves around another object |
| Asteroid | Rocky/Metallic object that orbits the Sun |
| Comet | Low Density objects composed mostly of ices |
| Meteoroids | Solid particles smaller than comets and asteroids that orbit the Sun |
| Meteor | Path of light from a meteoroid that entered into Earth's atmosphere |
| Meteroite | A meteoroid that landed on Earth's surface |
| Impact crater | A depression left on Earth's surface from a collision |
| Impact Event | The colliding of comets, asteroids and meteorites |
| Terrestrial Planets | Planets that have a rocky surface |
| Jovian Planets | Planets made mostly of gas |
| Rotation | Spin on an imaginary axis |
| Revolution | The movement around the Sun |
| Eccentricity | Describes the shape of an orbit |
| Inertia | An object at rest will stay at rest, an object in motion will stay in motion unless an opposing force affects it |
| What happens when two Celestial object get closer together? | Gravitation Attraction increases |
| What happens to the speed of an object in orbit as it get closer to the object it is orbiting around? | Velocity increases |
Created by:
Lmorgante