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Stars
Constellations
 A group
of stars
that appears to
form a pattern
in the sky
Virgo
AQUARIUS
Constellations Ursa
Major
- (Big Bear)
is the most
famous
constellation
Constellations The
Big
Dipper is part
of Ursa Major
Circumpolar Rotation around Polaris
What happens as you travel North?
 The
number of circumpolar stars
visible, increases as the observer
moves North
Stars- How far to a star?


Closest Star = Sun
93,000,000 miles
= 1 astronomical unit
Next closest star
 Proxima Centauri
 25 trillion miles
 2.5 x 10 13
 4.2 light years
Light year



Distance that light
travels in one year
5,900,000,000,000
miles
Polaris- 680 LY
Betelgeuse (red
supergiant ) is 490 LY
How do we size up?
Wow! Jupiter is BIG
Our sun is REALLY BIG!
Guess Not!
We are REALLY SMALL!
I feel so insignificant!
Color?
Depends on surface
temperature
cool
Hot- ~30,000 ° C
Medium- our sun (5500°C)
Classification of stars
Green
stars
look
white
to us!