Astronomy BYU online course – Flashcards
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What two gases is Jupiter made up of
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Hydrogen and helium
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Stars that allow astronomers to estimate distance of galaxy up to 15 million light years away
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Cepheid
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Plutos satellite
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Charon
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Which stage of development is our sun at?
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G2, main sequance, yellow star
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Whatis the solid part of a comet called?
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Nucleus
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Clothes hanger constellation star
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Star=regulus, constellation=leo
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Difference between asteroid and meteoroid
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Meteroids small, ast. big
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Little Dipper
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Ursa Minor
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Who first attached a spectroscope to a telescope to study star spectrums
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Secchi
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Who discovered 228 asteroids in the early 1890s by photographic techniques
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Max wolf
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Who figured out how to measure the circumference of the Earth
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Eratosthenes
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The sun shines most directly on the Tropic of Capricorn on which day? (North. Hemisphere)
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Dec 21/22, winter solstice
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What region do most comets reside
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Oort Cloud
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What are the 4 categories galaxies are classified in
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Spirals, barred spirals, ellipticals, irregular
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Dimmest magnitude star we can see with the naked eye
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6th magnitude
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What is thought to be center of most galaxies
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Black holes
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How long does it take our sun to revolve around the Milky Way galaxy?
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200 mil. (200,000,000)
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What color of light has lowest frequency?
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Red
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About how many stars does an average galaxy contain?
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100 billion
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What is another name for a shooting star?
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Meteors
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When fusion begins in a high mass protostar, what type of star is formed?
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Blue star
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What is the 'point of no return' in a black hole called?
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Event horizon
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How brights a star appears from earth
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Apparent magnitude
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Constellation
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Aries
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What lunar phase is after a full moon?
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Waning gibbous
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Which methods allow us to estimate the distance to the farthest galaxies observable?
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Brightest galaxy in cluster
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How are mass and luminosity related?
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More mass, more luminosity
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Who determined planets orbit in ellipses and not circles?
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Kepler
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What satellites is the largest in the solar system?
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Ganymede
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2 bright stars
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Betelgeuse, Rigel
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Asteroid belt gaps from Jupiter's gravity
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Kirkwood gaps
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How many times brighter is a magnitude 1 star from a magnitude 2 star
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2.5
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Why doesn't Venus have a magnetic field like Earths
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Rotation
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Plutos atmosphere
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Methane
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Where did the majority of stars fall on the HR scale
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Main sequance
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Constellation
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Hercules
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Which galactic cluster is our Earth in
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Local group
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Who proposed temperatures at sun were hot enough for thermonuclear fusion
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Eddington
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Star
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Polaris
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Which process allows heat to reach Earth
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Radiation
