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k_manivan
on FreezingBlue Flashcards.
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What do we base the certainty of our knowledge on?
EVIDENCE!
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HAS TO DO WITH THE UNIVERSE EXPANDING FASTER AND FASTER
Dark ENERGY
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HAS TO DO WITH THE WAY GALAXIES MOVE AND ROTATE
Dark MATTER
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1 THOUSAND SECONDS
= 20 Minutes
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1 MILLION SECONDS
10 Days
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1 BILLION SECONDS
30 Years
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What is bigger, a solar system or a star?
Solar system
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Whats bigger, a solar system or Galaxy?
Galaxy
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What is a group of galaxies called?
- Galaxy clusters
- (local clusters?)
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Magnitude?
Note on “magnitude” : by definition, it is either 1. Greatness in rank or status (1st being greater than 2nd), or it is 2. Greatness in size. Since a start that appears brighter will have more light coming through Earth’s atmosphere, its light is smeared out more, giving the appearance of being bigger in size. (Again, how bright it appears is due to a combination of distance—closer looks brighter, and the amount of light it actually gives off—measured by luminosity.)
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How old is our universe?
13.7 Billion years old
(14 billion)
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Our universe
"began" as space-time expanded in the Big Bang. There was no outside and there was no center. NO atoms had formed.
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Milk Way Galaxy
Formed from one of the many enormous clouds in the universe pulling together, spinning..
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How old is the Milky Way?
13.5 Billion
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Our Sun and our Solar system
Formed from one of many huge clouds inside our milky way pulling together, spinning..
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How old is our solar system?
5 Billion
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How long ago did "simple" life on earth began?
4 Billion
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Simple Life on earth
"Simple life" Organic MOLECULES became self replicating
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When did humans first appear?
200,000 Years ago
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Does our universe have a center?
NO
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What is a light year (ly)?
It is the distance that light travels within a year
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1 ly is about how far apart?
2 close stars
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10 AU is about how far apart?
2 planets that are far apart
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1 Mpc is about how far apart?
2 Galaxies
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28,000 ly is about how far apart?
Our solar system plus the center of our galaxy
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1 AU is about how far apart?
Two close planets
Distance from the earth and the Sun
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What is a star cluster?
Clouds formed in groups
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What is the range of how many stars are in the galaxy?
0.1 - 100 Billion
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About how many stars are in our Milky Way?
2-400 billion stars
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About how many galaxies are in our universe?
100 billion
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