Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
Heliocentric Model |
The "Sun-centered" model of the solar system |
|
|
Geocentric Model |
The "Earth-centered" model of the solar system |
|
|
Solstic |
2 times in the year when the sun reaches its highest or lowest point in the sky at noon |
|
|
Equinox |
Sun crosses the equator and day and night are of equal lengths |
|
|
Ellipse |
An oval formed around 2 foci;the orbital paths of planets traveling around the sun. |
|
|
Light years |
The distance that light travels in 1 year; used to measure distances between stars and galaxies |
|
|
Astronomical units |
A measure of distance used to describe the position of planets relative to the sun |
|
|
Why was the invention of the telescope important? |
Objects in space became more obvious |
|
|
Nebulae |
Vast clouds of gas (mostly hydrogen) and dust in space,where stars forms |
|
|
Consolation |
Groupings of star that form patterns in the night sky |
|
|
Interstellar matter |
The gases and dust that exist in the space between stars. Some of it comes from exploding stars . |
|
|
3 types of galaxies |
•spiral galaxy •elliptical Galaxy •irregular Galaxy |
