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Standard 1 Objective 2 Study Notes Astronomy 2 1 • _____ Mars is the most likely destination for voyages and surface exploration manned _________ similar to because it has some conditions ______ Earth. 2 • Liquid water and oxygen/carbon dioxide in the Earth that atmosphere are conditions on _______ biosphere support the ____________. 3 • The _______ largest solar system object is the _____. Sun 4 • The ______ solar ______ wind and heat from the newly formed sun affected the composition of the inner planets of the solar system by causing lighter ________. elements them to lose most of their ______ 5 • A rock sample containing Strontium 30 is 25 of the original Strontium tested and ___% remains. The Strontium 30 has undergone half-life’s two _________. 6 • The ____ age of the solar system is estimated by radioactive elements. scientists by dating __________ 7 • A spherical region that surrounds the solar comets is system and that contains billions of ______ Oort cloud. the ______ 8 • A _______ galaxy is made up of______ stars , dust and gas bound together by gravity. 9 • A rotating cloud of ____ gas and _____ dust from which Earth’s solar system formed is called the _______ solar _______. nebula 10 • The two inner planets most ______ alike in size, density are Venus and _______. Earth mass, and ________ 11 • The _____ least dense planet in the solar system is Saturn ________. 12 • The factors that contribute to _________ Mercury’s daily temperature fluctuation of about 600°C are close the planet’s slow rotation and its ______ proximity to the sun. 13 • _______ Mars’s volcanoes are larger than those of tectonic Earth because Mars has no moving ________ plates. 14 • Small bodies that _____ orbit planets are called moons ______. 15 • About ___% 99 of all matter contained in the sun solar nebula now exists in the _____. 16 • When early Earth’s atmosphere formed, helium and _________ hydrogen gases were lost _______ weak because Earth’s gravity was too _____. 17 • ______ Pluto is NOT considered a major planet by astronomers. 18 Venus is a planet that experiences a • _______ greenhouse effect. runaway ___________ 19 • The right combination of ___________, temperature water, oxygen supports _____ life on Earth. and _______ 20 Uranus • _________ Neptune is a planet that is similar to ______ in terms of its size and mass. 21 early atmosphere developed when many • The _____ volcanic eruptions released large amounts of ________ gases in a process called outgassing. 22 • The ________ asteroid belt can be found between the two planets Mars and Jupiter. 23 • A ____-_____ light year the distance light travels in a year. 24 • From _________ smallest to the largest in size would be the Solar System, Milky Way Galaxy, and the ________. Universe 25 • ___________ Radioactive substances are used by age of Earth scientists to measure the ____ because they give off radiation at a rate predictable, steady ____. 26 • The _____ most abundant atmospheric gases found hydrogen and on the outer planets are _________ _______. helium 27 • The solar system is much _______ smaller than the Milky _____ Way galaxy. ______ 28 • _____ Mars is most like Earth because it has an atmosphere and moderate ____________. temperatures __________ 29 • The Earth’s atmosphere and the _______ distance Earth is from the sun combine to create an oxygen rich atmosphere. _______ The End!!!
