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37 Cards in this Set
- Front
- Back
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Our galaxy is classified as an?
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Spiral galaxy
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Besides the sun and the moon, what is the brightest object in the sky?
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Venus
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All stars?
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Produce thier own light
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The most widely accepted model of the formation of the solar system is the?
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nebular model
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An observation of the red shift of galaxies suggests that the universe is?
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expending
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Kepler showed that the orbits of the planets are?
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elliptical
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Which of the following does NOT have rings?
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Mars
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A light year is?
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A unit of distance
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Who first proposed that the universe is expending?
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Darwin
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The Milky Way galaxy contains intersteller matter that may?
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Form new stars
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Supergiant stars?
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Form supernovas
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Energy is released is stars as a result of?
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Fusion reactions
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Nearly 90 percent of all stars are at what piont in thier life cycles?
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Mid-life
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Planets may have formed out of material orbiting the early sun through the process of?
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accretion
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Our solar sytem is inside the?
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Milky Way galaxy
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In stars, energy is produced primarily as hydrogen atoms are combined to form?
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Helium atoms
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The inner planets are separated from the outer planets by?
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An asteriod belt
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A star is born when?
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Nuclear fuison starts in the core.
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Spiral galaxies often appear bluish due to an abundance of?
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Old years
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The big bang thoery states that the universe began with a gigantic explosion?
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10 to 20 billion years ago
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Which of the following is NOT an inner planet?
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Jupiter
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Mercury is characterized by?
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Very extreme temperatures
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Astronomers estimate that the universe contains?
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100 billion galaxies.
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First proposed that Earth and the other planets orbit the sun?
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Copernicus.
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All of the planets in our solar system?
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Orbit the sun.
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During a solar eclipse?
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The moon blocks out the sun.
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The number of universes to exist is?
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One.
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The phases of the moon are determined by?
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The relative positions of Earth, sun, and moon.
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The sun is?
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A typical star.
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Most of the stars in the Milky Way will end their lives as?
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White dwarfs.
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Elliptical galaxies often appear reddish due to an abundance of?
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Old stars.
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The Great Red Spot is believed to be a giant storm in the atmosphere of?
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Jupiter.
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Clusters of galaxies can form larger groups called?
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Superclusters.
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Not including the sun, the closest stars to Earth are?
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4.3 light-years away.
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Hotter stars glow with light that is more intense at?
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Shorter wavlengths (toward the blue end of the spectrum.)
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The surface temperature of a star can be estimated based on the star's?
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Color.
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Galaxies are classified based on their?
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Shape.
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