Astronomy 1P02 Second 50 – Flashcards
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The planet closest in size to Earth is
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Venus
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The distance of Jupiter from the Sun is about ____ AU
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5
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Which of these substances could condense and form solid particles near the proto-sun
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Metallic Compounds
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All planets in the solar system have at least one moon
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False
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The more massive planets in our solar system tend to be less dense than the lower mass planets
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True
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Jovian planets have longer rotation periods than the terrestrial planets
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False
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All the planets orbit the Sun counterclockwise as viewed from above the earths North Pole
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True
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If a high tide occured in Halifax at 10:00 am then high tide tomorrow will be at about
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10:50
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The moon keeps the same side towards the earth because of
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the tidal force exerted by the earth
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If the moon were covered with water the number of tidal bulges would be
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two
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The Roche limit is
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the critical distance from a planet inside which the tidal force on a satellite is sufficient to disrupt it
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The rings of Saturn are inside the Roche limit for Saturn
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True
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Shepherd moons are
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the moons near the edges of planetary rings
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What is the Cassini division of Saturn's rings
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A large gap visible from earth produced by an orbital resonance with the moon Mimas
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All Jovian planets have rings
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True
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What mechanism is most responsible for generating the internal heat of Io that drives volcanic activity
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tidal heating
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The Gallilean satellites of Jupiter have synchronous rotation
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True
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What are greenhouse gases
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Gases that absorb infrared light
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Clouds, snow and ice have higher reflectivity than rock
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True
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Which of the following planets has the highest atmospheric pressure at the surface: Mercury, Venus, Earth, Mars
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Venus
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Saturn's atmosphere is mostly
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Hydrogen
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The atmosphere of Mars is mostly
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Carbon Dioxide
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Which of these planets has the lowest atmospheric pressure Venus, Earth, Mars
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Mars
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If there were no greenhouse effect on the earths atmosphere its average temperature would be
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below the freezing point of water
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Liquid water on earth dissolves carbon dioxide in Earths atmosphere
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True
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The diameter of the largest known asteroid is roughly
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1000km
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Most asteroids are located
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in the asteroid belt
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The fact that mars has no magnetic field that would shield it from the solar wind and cosmic rays is a contributing factor in explaining its thin atmosphere
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True
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The asteroid belt is located between the orbits of mars and jupiter
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True
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The Kirkwood gaps result from
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regular gravitational pulls by Jupiter
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C-asteroids composed of silicates mixed with dark carbon compounds are located primarily
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at the outer edge of the asteroid belt
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The asteroids with highly elliptical orbits are
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Apollo asteroids
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Where are the Trojan asteroids located
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Along the orbit of Jupiter, 60 degrees ahead and behind jupiter
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S-asteroids are located primarily
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at the inner edge of the asteroid belt
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The combined mass of all asteroids in the asteroid belt is
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less than that of any terrestrial planet
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S-asteroids have
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a stony appearance
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What do we call a small piece of solar system debris found on earth
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Meteorite
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The largest number of meteorites are
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Stones
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All asteroids have retrograde (clockwise) orbital motion as seen from far above the earth's north pole
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False
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The speed of a comet increases as it gets closer to the sun
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True
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Which of these planets has the largest diameter: Jupiter, Saturn, Uranus, Neptune
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Jupiter
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The impact craters have floors that are lower than the surrounding surface
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True
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Which of these planets has the smallest mass: Mercury, Venus, Earth, Mars
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Mercury
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The earth's inner core consists of
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Solid iron and nickel
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The active volcanoes on earth are often found near the boundary of two tectonic plates
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True
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On average, one observes more meteors before midnight
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False
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The numerous caters we see on solid surfaces on so many solar system bodies are evidence that
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They were bombarded in their youth by many solid objects
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When we see a meteor shower it means that
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earth is crossing the orbit of a comet
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What is the most abundant chemical element in Earth's atmosphere
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Nitrogen
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Which of these planets has the highest albedo (reflectivity): Mercury, Venus, Earth, Mars
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Venus
