Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
ch.18 sec.1-3 vocab
astronomy
| Term | Definition |
|---|---|
| astronomy | the study of the universe |
| year | the time required for the earth to orbit once around the sun |
| month | a division of the year that is based on the orbit of the moon around the earth |
| day | the time required for earth to rotate once on its axis |
| telescope | an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation |
| refracting telescope | a telescope that uses a set of lenses to gather and focus light from distant objects |
| reflecting telescope | a telescope that uses a curved mirror to gather and focus light from distant objects |
| electromagnetic spectrum | all of the frequencies or wave lengths of electromagnetic radiation |
| constellation | a region of the sky that contains a recognizable star pattern and that is used to describe the location of objects in space |
| zenith | the point in the sky directly above an observer on earth |
| altitude | the angle between an object in the sky and the horizon |
| horizon | the line where the sky and the earth appear to meet |
| light-year | the distance that light travels in one year; about 9.46 trillion kilometers |
Created by:
sadie.b04
Popular Earth Science sets