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42 Cards in this Set
- Front
- Back
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The age of the Universe is...
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13.7 billion years
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The age of our solar system is...
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4.6 billion years
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The age of our earth...
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4.5 billion years
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What is the upper limit of the estimated size of the universe from one side to another?
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20 Bly
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Which his the ranking for the size (width) of the following objects from smallest to largest?
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Planet, Star, Solar System, Galaxy, Universe
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The solar system contains about 100 billion stars... true or false?
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FALSE
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The sequence of the methods for determining distance in the correct order from nearest to farthest?
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Radar ranging, parallax, main-sequence fitting, Cepheid variables, Tulley-Fisher relation, white dwarf supernova
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Why are Cepheid variables so important for measuing distances in astronomy?
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Their luminosity can be inferred form their period.
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Dr. Smith believes that the Hubble's constant is H=70km/s/Mpc. Dr. Jones bellives thta it is H=50km/s/Mpc. Which statement below automatically follows?
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Dr Smith believes the universe is younger than Dr. Jones believes.
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Does A It will take four light years to reach alpha centauri, B it will take me light years to completely this homework, C jessie is light years ahead of her time, D. The milky way galazy is about 100000 light years in diameter use the term light year correctly?
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A and D
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What is an astronomical unit?
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The average distance from the earth to the sun
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A scientific question is one that...
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can be tested by experiment and/or observation
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What is the definition of luminosity?
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The total amount of light energy emitted from a star per second.
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How did Eratosthenes estimate the size of the earth in 240 BC?
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By comparing the maximum altitude of the sun in two cities at different latitudes.
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He theorized that the structure of the universe was made of four elements, earth wind fire and water
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Aristotle
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The scientists proposed the geo-centric model of the universe
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Ptolomy
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How did the Ptolemaic model explain the apparent retrograde motion of the planets?
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It held that the planets moved along small circles that moved on larger circles around the earth.
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What happens during the apparent retrograde motion of a planet?
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The planet appears to move eastward wtih respect to the stars over a period of many nights.
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Which person reorganized the spectral classification scheme into the one we use today and personally classified over 400,000 stars?
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Annie Jump Cannon
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THis Danish nobleman's pre-telescope observations reintroduced observational astronomy to Western Europe
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Brahe
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I was a mathematician who joined Tycho in Prague and developed my own set of laws for PLanetary motion in the solar system
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Kepler
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The first person to use the telescope as an astronomical tool and one of the first modern Experimental scientists known for the motion of falling objects.
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Galileo
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I was able to determine the relationship between how far a distant galaxy is to the speed it is moving away
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Russel
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A champion of the Steady State Universe conceived this theory with Hermann Bondi and Thomas Gold in 1946
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Hoyle
*********** prob not on didn't discuss |
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Stars located near **BLANK** appear to move in circles when viewed from Earth
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POLARIS
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What do we call the day(s) of the year when the sun rises directly in the East and sets directly in the West
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Equinoxes
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During the new moon phase, how much of the moon's total surface is being illuminated by sunlight?
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half
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In what phase and location described below will the Moon be when a solar eclipse occurs?
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new phase and crossing Earth's orbital plane
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Which of the following locations experiences the smallest amount of change in sunlight over the course of a year?
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Equator
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In what phase and location described below will the moon be, when a lunar eclipse occurs?
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Full phase and crossing the Earth's orbital plane
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The sun appears to rise and set in our sky because *BLANK*, and you are one year older each time *BLANK*
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Earth rotates on its axis
Earth completes one orbit of the sun |
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Suppose the date is June 21 and the Sun never sets, just touching your north horizon at midnight. Where are you?
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The Arctic Circle
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The set of constellations visible in the night sky changes from month to month due to
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the orbit of the earth around the sun
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A constellation visible from one point on earth might look completely different
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NONE OF THE ABOVE (from a different country, on the moon, on another planet of our solar system)
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The Zodiac refers to 12 constellations that
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form a east-west ring around the earth
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Constellations slowly change shape over the years due to
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the relative motion of the sun and stars
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The typical moon orbits its planet...
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in the direction of planetary rotation
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To calculate the mass of a planet, it is most useful to know which of these facts?
A. mass of the planet's smallest moon B. orbital period of any of the planet's moons C. rotational period of the planet's largest moon D. rotational period of the planet about its star |
B
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As Earth rotation slows over time, the Moon will...
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move slightly further away from Earth
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The ecliptic is a plan that contains..
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the orbit of the earth
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Which observation first made by Galileo proves that all the planets move directly around the sun?
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phases of Venus (not sunspots or mountains on the moon)
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Viewed north of the Ecliptic, most planets in the solar system orbit the sun in a
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Counterclockwise direction
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