SCIN261 quiz 4

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American Public University *

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261

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Astronomy

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Apr 3, 2024

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6

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Quiz 4 (Weeks 7 & 8) - Results Attempt 1 of 1 Written Jan 23, 2024 11:51 AM - Jan 23, 2024 12:04 PM Attempt Score 90 / 100 - 90 % Overall Grade (Highest Attempt) 90 / 100 - 90 % Question 1 10 / 10 points The Drake equation attempts to predict the Hide ques±on 1 feedback Question 2 10 / 10 points Which of the following best describes the material which makes up the nucleus of a comet? number of intelligent civilizations in the universe. number of inhabitable planets around stars in our Galaxy. number of technologically advanced civilizations in our Galaxy. probability that primitive life exists elsewhere in our Galaxy. The Drake equation attempts to predict the number of technologically advanced civilizations that might exist in our Galaxy.
Hide ques±on 2 feedback Question 3 10 / 10 points The tail of a comet Hide ques±on 3 feedback Question 4 10 / 10 points At present time, the most promising destination for future missions looking for current life elsewhere in our solar system beyond Earth is Gaseous. Dirty ice. Metallic crystals. Rocky. A comet's nucleus is like a dirty snowball made of ice. is gas and dust pulled off the comet by the Sun's gravity. always points away from the Sun. trails behind the comet, pointing away from the Sun as the comet approaches it, and toward the Sun as the comet moves out of the inner Solar System. is gas and dust expelled from the comet's nucleus and blown outward by radiation pressure and the solar wind. both (b) and (d). The solar wind dislodges gas and dust from the comet and forces the material into very narrow (relative to their length) tails. The tails always point away from the sun.
Hide ques±on 4 feedback Question 5 10 / 10 points Scientists are now targeting Europa, one of Jupiter's moons, as a likely site to search for elementary life forms because Hide ques±on 5 feedback Question 6 0 / 10 points Why is liquid water believed to be essential to the development of life? the Moon. Europa. Io. Mercury. There is plenty of liquid water in Europa. there is strong evidence for liquid water beneath the thick ice layer on its surface. there appears to be large amounts of dark organic material spread on its surface. radio signals that follow a recognizable pattern have been detected from this moon. changes have been seen in the dark lines crossing the icy surface which have a spectral signature of vegetation. Beneath Europa's icy crust lies a liquid ocean with more water than Earth contains.
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Hide ques±on 6 feedback Question 7 10 / 10 points Which object in the Asteroid Belt is now classed as a Dwarf Planet? Hide ques±on 7 feedback Question 8 10 / 10 points Trans-Neptunian objects are typically located It provides an electrically conducting medium. Without water there would be no shoreline. It combines chemically with other compounds to form the building blocks of life. It provides an efficient way to transfer substances from a cell to the cell's environment. Because it flows and is a universal solvent, liquid water provides an efficient way to transfer substances from a cell to the cell's environment. Pluto. Eris. Pallas. Ceres. Ceres is the largest object in the asteroid belt. It was considered and asteroid (1 Ceres) but reclassified as a Dwarf Planet in 2006. near the Jovian planets. within the Kuiper belt. within the asteroid belt. beyond the Oort cloud.
Hide ques±on 8 feedback Question 9 10 / 10 points Short-period (or Jupiter-family) comets orbit the Sun in fewer than 20 years and come from Hide ques±on 9 feedback Question 10 10 / 10 points Asteroids are mainly made from what? Hide ques±on 10 feedback Done Trans-Neptunian objects are typically located within the Kuiper belt, but the scattered disk contains some of them (e.g. Eris) the Oort Cloud. the main Asteroid belt. the galactic center. the Kuiper belt. Jupiter-family comets come from the Kuiper Belt. Ice and Gas. Metal and Ice. Rock and/or Metal. Rock and Ice. Asteroids are composed of rock, metal, or a combination of both.
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