Astronomy Chapter 5 Flashcard
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When thermonuclear fusion reactions began at its center.
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At what point in time do we say that the protosun became the Sun?
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greater than 5 times.
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Compared to the orbital distance of Earth from the Sun, the equivalent orbital distances for the outer planets are
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elements are transformed into heavier elements by nuclear reactions.
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Fusion is the process by which
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Saturn, Uranus, Jupiter, Neptune
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In order of increasing density, the large, outer planets would be listed as
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Jupiter
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In our solar system, which of the following planets is NOT a member of the terrestrial group?
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Mars
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In our solar system, which of the following planets is a member of the terrestrial group?
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the ecliptic plane.
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Most of the planets orbit the Sun on or close to
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Mars and Jupiter
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the asteroid belt exists between the orbits of which planets?
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close to the density of water.
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The average density of the large, outer planets is
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in cool gas and dust clouds.
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The birthplace of the Sun and planets (and of other stars and maybe their planets) is thought to have been
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
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The correct sequence of planets in our solar system, from the Sun outward, is
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Pluto.
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The dwarf planet whose orbit has the greatest inclination to the plane of the ecliptic is
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Earth.
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The largest of the terrestrial planets is
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accretion of solid planetesimals containing mostly rocky material.
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The manner in which the terrestrial planets formed was
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hydrogen
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The most abundant material in the universe is
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the Sun and planets slowly condensed to their present form from a gas and dust cloud.
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The most likely mechanism for the solar system is that
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condensation of a nebula of cold gas and dust into the Sun and planets.
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The most probable theory for the formation of the solar system is
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slightly elliptical, but nearly circular.
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The overall shape of the orbits of most of the planets in the solar system is
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Earth
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The planet with the greatest mean density is
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Mercury and Pluto.
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The planets whose orbits are most noticeably elliptical are
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Mercury.
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The smallest of the planets is
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Mercury.
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The smallest terrestrial planet is
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accretion of planetesimals to form a core, followed by gravitational capture of hydrogen and helium gas.
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The steps in which the large, outer planets formed were
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The protosun
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What name is given to the concentration of mass that formed at the center of the solar nebula, and eventually became the Sun?
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In the central cores of stars.
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Where in the universe are heavy elements, with masses greater than that of helium, being produced at this time?
