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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!