Science Unit 7 – Flashcards
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All planets in the solar system revolve around
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The sun
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A lunar eclispe occures when positions of the sun, moon, and Earth are such that one od these objects is between the other two. During a lunar eclipse, which of these objects is between the other two?
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Earth
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A solar eclispe occures when positions of the sun, moon, and Earth are such that one od these objects is between the other two. During a solar eclipse, which of these objects is between the other two?
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Moon
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Phases of the moon are caused by __________ shadow.
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None of the above
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Tides on Earth are caused primarily by
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The moon's gravitational force
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Venus is known for its
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thick atmosphere
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___________ is the only planet in the solar system known to sustain life
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Earth
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Olympus Mons, a volcano on _________, is the largest mountain in the solar system.
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Mars
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The Great Red Spot, a hurricane-like storm with twice the diameter of Earth, is found on
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Jupiter
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The inner planets are terrestrial because they
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Are small and highly dense
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All four outer planets are
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Gas giants
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In 1687, __________ explained that gravitational forces hold the solar system together.
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Newton
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Kepler correctly proposed that the planets orbited the sun in _________ orbits
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Elliptical
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According to the __________ hypothesis, the solar system formed from a cloud of dust and gas
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Nebular
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During which phase of the moon could Earth cause a lunar eclipse?
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Full
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In what phase could the moon cause a solar eclipse?
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New
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The largest body in the solar system is
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The sun
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According to Copernicus' model of the solar system,
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Earth orbits the sun
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A rock that strikes earth is called a
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Meteorite
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By measuring small gravitational wobbles in stars, astronomers have discovered
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More than 200 exoplanets
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The asteroid belt is found between Jupiter and
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Mars
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Most comets come from the
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Oort cloud
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The solar system is held together by
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Gravitational forces
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Many small bodies composed of ice and rock lie
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Beyond the gas giants
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Mercury is characterized by
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Very extreme temperatures
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Planets my have been formed out of material orbiting the early sun through the process of
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Accretion
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There are _________ planets that orbit the sun
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Eight
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Clusters of galaxies can form larger groups called
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Superclusters
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All stars radiate
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All of the above
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Stars are held together by
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Gravitational forces
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Quasars are thought to be the centers of
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Distant galaxies
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Energy produced in a star's core moves through the star by
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Convection and radiation
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The brightness of a star depends on its
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All of the above
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The composition of a star can be identified by
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The lines in its spectrum
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The sun will eventually end up as a
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White dwarf
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A ___________ is so massive and compressed that not even light can escape its gravity
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Black hole
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A galaxy is a collection of ___________ bound together by gravity
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Stars
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Interstellar matter is composed of ________ found between stars in a galaxy
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Dust and gas
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Astronomers group galaxies into three types, according to their
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Shapes
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Quasars are among the strongest source of _____________ in the universe
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Radio waves
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Our solar system is located in which of these galaxies?
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Milky Way
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A star generates energy by
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Fusion
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Elliptical galaxies often appear radish due to an abundance of
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Old stars
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Our galaxy is classified as a(n)
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Spiral galaxy
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The universe is made up of mostly
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Empty space
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A light-year is a unit
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Distance
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An observation of the red shift of galaxies suggests that the universe is
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Expanding
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An astronomer observes four stars, each of which is a different color. Of these stars, the _____________ star is the hottest
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Blue
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A star is born when
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Nuclear fusion starts in the core
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Kuiper Belt
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Area beyond Neptune populated by small bodies
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Jupiter
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Planet with the most satellites
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Hydrosphere
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A unique characteristic that makes earth habitable
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Mars
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Terrestrial planet with a thin carbon dioxide atmosphere
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Earth
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Only planet with large amounts of liquid water and a protective atmosphere
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Ring System
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Characteristic of an outer planet
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Mercury
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Planet closest to the sun
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Neptune
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Planet farthest from the sun
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Solid rocky surface
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Characteristic of an inner planets
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Saturn
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Planet with the most extensive ring system
