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# Edinboro University of Pennsylvania - GEOS 103 - Class Notes - Week 10

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Edinboro University of Pennsylvania - GEOS 103 - Class Notes - Week 10

##### Description: These notes cover material from this past week. Hope everyone did well on their quiz!
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GEOS 103.001 – Observing Our Cosmos Edinboro University Course Dr. David Hurd Week 10 Class Lecture Notes (4/4 – 4/6) 4/4 The moon’s magnitude is usually between -9 and -11 o Its absolute magnitude is 32.61 The human eye can view up to about 6-7 magnitude o A higher magnitude is not visible with the naked eye Deneb’s magnitude = 1.25 o Absolute magnitude = -6.93 If Deneb were 33 ly away from Earth, it would be visible during
the day
Venus mag = -4.33 o Visible during the day What is a nebula? A cloud of gases from which stars are born o Nebulae are also created by the death of stars 4/6 Absolute magnitude of the sun = 4.83 o Our sun is not a particularly bright star
o It appears bright because it is close to us
8 “light minutes” away If a star’s magnitude is lower than its absolute magnitude, it is less than 33 ly
away from Earth
There are 300 billion stars in the Milky Way Galaxy IV. Inferior Planets – a planet who is closer to the sun than Earth (Venus or Mercury) 1. Conjunction – when planets appear clustered together in the sky a. Inferior Conjunction i. When a planet aligns between the Earth and the Sun ii. A transit may occur 1. Transit- when the disk of the planet moves in front of the  disk of the sun” a. Transits of Venus are much more rare than Mercury

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##### Description: These notes cover material from this past week. Hope everyone did well on their quiz!
2 Pages 22 Views 17 Unlocks
• Notes, Study Guides, Flashcards + More!
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