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25 Cards in this Set
- Front
- Back
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The average distance from the Earth to the Sun
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1 Astronomical Unit
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From smallest to largest, distances measure
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A yard, a kilometer, 1 au, a light-yer
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If the distance to the nearest star is 4.2 light years away,
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then the light we see is from 4.2 years ago.
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The Milky Way is a
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Spiral galaxy that is a part of a cluster of galaxies and 80,000 lightyears away.
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Put in order of size:
Milky Way Solar System Cluster of Galaxies Earth |
Earth
Solar System Milky Way Cluster of Galaxies |
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A planet is different from a star because
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Planets reflect light while stars produce their own.
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If the solar system was scaled to the size of a classroom the nearest star would be located in rue
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Dallas, TX
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If you stand on the Earth's equator the celestial equator would pass
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directly overhead.
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The apparent visual magnitude of a star is
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a measure of the star's intensity.
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If the AVM of a star is 7.3
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it is not visible to the unaided eye.
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The stars near the north celestial pole appear to move
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counter-clockwise
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Stars in the same constellation may actually
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be very far apart from the observer and each other.
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Northern Hemisphere winters are colder than Northern Hemisphere summers because
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the light from the sun shines more on the Northern Hemisphere during the summer and the period of sunlight is longer during the summer than the winter.
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The planets of our solar system that are never visible to the naked eye are
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Uranus and Neptune
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A solar eclipse may occur when
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the moon is new.
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Synodic Period
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is a period in which the moon completes a cycle of the lunar phases and is approximately 29.5 days long
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A totally eclipsed moon glows coppery red because
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only red light is able to pass completely through the Earth's atmosphere.
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Parallax is the
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apparent motion of an object due to the motion of the observer
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Galileo's observations of complete set of phases of Venus proved
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Venus orbited the sun.
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The purpose of using epicycles and deferent to explain the motion of planets in the night sky was to account for
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retrograde motion
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The orbit of the planet Jupiter is ellipses with the Sun at one focus.
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At the other focus there is nothing.
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The larger the orbit, the longer the orbital period.
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Kepler's 3rd law.
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Resolving power
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is a telescopes ability to show fine detail and depend on the diameter of the object.
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Increasing the diameter of a telescope increase
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it's light gathering power and it's resolving power.
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Occam's Razor states
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if everything else is equal, choose the simplest model.
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