Reading...
Play button
Play button
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;
15 Cards in this Set
- Front
- Back
|
How old is the Universe?
|
Between 12-15 billion years
|
|
|
How old is our sun?
|
5 billion years.
1/2 its lifespan |
|
|
How old is the earth?
|
4.6 billion years
|
|
|
When did life appear?
|
Between 3.5-4 billion years ago
|
|
|
How old are the oldest known rocks?
|
3.8 Billion
|
|
|
Oldest rocks from the ocean are how old?
|
200 million years
|
|
|
Which generation star is the sun?
|
Second generation
|
|
|
Who was the first person to catalog galaxies
|
Hubble
|
|
|
What is the Red shift?
|
Based on the doppler effect
The amount of shift indicates the rate of movement large=high velocity small= lower velocity Red=moving away Blue=coming towards us Discovered by Hubble in 1929 |
|
|
What do stars fuse together?
|
hydrogen and helium during FUSION
|
|
|
Stars vary in size and color depending on:
|
How much hydrogen fuel they have (a fixed amount)
AND How quickly they burn that fuel |
|
|
Stellar Brightness is controlled by:
|
Size
Temperature Distance |
|
|
Hot stars
|
Temp: 30,000k+
Rapid rate of Fusion Short wave length--appear blue short lifespan |
|
|
Cool stars
|
Temp: <3,000k
Slow rate of Fusion Long wave length--appears red long lifespan: 20+ billion years |
|
|
Our Sun
|
Medium star
appears yellow 5 billion years old--1/2 way through hydrogen supply 2nd generation |
